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Corporate Presentation March 2017 Forward-looking Information This presentation contains forward- looking statements. When used in this presentation, the words will, intend, plan, potential, generate, deliver,


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SLIDE 1

Corporate Presentation March 2017

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SLIDE 2

Forward-looking Information

1

This presentation contains forward-looking statements. When used in this presentation, the words “will”, “intend”, “plan”, ”potential”, “generate”, “deliver”, “can”, “continue”, “drive”, “anticipate”, “target”, “come”, “create”, “position”, “achieve”, “seek”, “propose”, “forecast”, “estimate”, “expect”, “solution” and similar expressions, as they relate to AltaGas or any affiliate of AltaGas, are intended to identify forward-looking

  • statements. In particular, this presentation contains forward-looking statements with respect to, among others things, business objectives, strategies, expected returns, expected growth (including growth in

normalized EBITDA, normalized f unds from operations, dividends, payout ratios, customers, rate base and the components thereof) and sources of growth, capital spending, cash flow and sources of funds, results of operations, performance, expectations regarding growth and dev elopment projects and other opportunities (including expected EBITDA contributions, capital expenditures, facility design specif ications, location and location benefits, ownership, operatorship, ability to expand, retrofit, contracting capability, construction expertise, progress of construction, development timelines, capacity, connection capability to infrastructure, transmission options, options for producers, access to markets, potential end markets, sale and purchase of LPG, export capability, sources of supply, tolling arrangements, shipping costs and timeline and targets and expected dates of construction completion, final investment decision, in-service and on-stream), expectations of Ridley Island Propane Export Terminal being Canada’s f irst west coast propane terminal, expectations on future market prices, access to capital markets, liquidity, target ratios (including normalized FFO to debt), expectations for the longev ity and reliability of infrastructure assets, the quantity and competiveness of pricing, the strength of AltaGas’ relationship with First Nations and Government, low generational v olatility and high stability of AltaGas’ Northwest British Columbia hydro projects, the ability of AltaGas to extend the Blythe PPA, expectations regarding cost of Blythe relative to new build, barriers of entry for new gas generation and v alue of existing infrastructure, development of solar projects, incremental battery storage opportunities and other renewable projects, expected pricing for RA, combined energy and ancillary services, system betterment, natural gas pipeline replacement and ref urbishment programs, Marquette Connector Pipeline, the benefits of the Painted Pony alliance, the stability and predictability of dividends and the sources

  • f f unds therefor, expectations regarding v olumes and throughput, AltaGas’ view with respect to the California power market, future energy needs of California, sources of future supply and opportunities that

may become av ailable for existing AltaGas facilities, commodity exposure, frac spread exposure, hedging exposure, foreign exchange, changes in tax law, demand for propane, expectations regarding

  • perating f acilities (including target shipments from Ferndale and EBITDA contributions from such facilities), expected dates
  • f regulatory approvals, licenses and permits and financial results. Information and

statements contained in this presentation that are not historical facts may be forward-looking statements. Forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause actual results or events to differ materially from those anticipated in such forward-looking

  • statements. Such statements reflect AltaGas’ current views with respect to future events based on certain material factors and assumptions and are subject to certain risks and uncertainties, including, without

limitation, changes in market competition, governmental or regulatory developments, changes in political environment, changes in tax legislation, general economic conditions, capital resources and liquidity risk, market risk, commodity price, foreign exchange and interest rate risk, operational risk, volume declines, weather, construction, counterparty risk, environmental risk, regulatory risk, labour relations and

  • ther f actors set out in AltaGas’ continuous disclosure documents. Many factors could cause AltaGas’ or any of its business segments’ actual results, performance or achievements to vary from those

described in this presentation including, without limitation, those listed above as well as the assumptions upon which they are based proving incorrect. These factors should not be construed as exhaustive. Should one or more of these risks or uncertainties materialize, or should assumptions underlying forward-looking statements prove incorrect, actual results may vary materially from those described in this presentation as intended, planned, anticipated, believed, sought, proposed, forecasted, estimated or expected, and such f orward-looking statements included in this presentation herein should not be unduly relied upon. These statements speak only as of the date of this presentation. AltaGas does not intend, and does not assume any obligation, to update these forward-looking statements except as required by

  • law. The f orward-looking statements contained in this presentation are expressly qualif ied by this cautionary statement.

Financial outlook inf ormation contained in this presentation about prospective financial performance, financial position or cash flows is based on assumptions about future events, including, without limitation, economic conditions and proposed courses of action, based on management’s assessment of the relevant information currently available. Readers are cautioned that such financial outlook information contained in this presentation should not be used f or purposes other than for which it is disclosed herein. In this presentation we use certain supplementary measures, including Normalized EBITDA and Normalized Funds f rom Operations, that do not hav e any standardized meaning as prescribed under U.S. generally accepted accounting principles (“GAAP”) and, therefore, are considered non-GAAP measures. AltaGas’ method of calculating these non-GAAP measures may differ from the methods used by other

  • issuers. Readers are adv ised to refer to AltaGas’ annual Management’s Discussion and Analysis (“MD&A”) for the year ended December 31, 2016 for a description of the manner i

n which AltaGas calculates such non-GAAP measures and f or a reconciliation to the nearest GAAP financial measure. Readers are also cautioned that these non-GAAP measures should not be considered as alternatives to other measures of f inancial performance calculated in accordance with GAAP. Additional inf ormation relating to AltaGas can be f ound on its website at www.altagas.ca. The continuous disclosure materials of AltaGas, including its annual MD&A and Consolidated Financial Statements, Annual Inf ormation Form, Information Circular, material change reports and press releases, are also av ailable through AltaGas’ website or directly through the SEDAR system at www.sedar.com and prov ide more inf ormation on risks and uncertainties associated with forward-looking statements. This presentation does not constitute an offer or solicitation in any jurisdiction or to any person or entity. No representations or warranties, express or implied, have been made as to the accuracy or completeness of the information in this presentation and this presentation should not be relied on in connection with, or act as any inducement in relation to, an inv estment decision.

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SLIDE 3

AltaGas Profile

2

Well positioned with a substantial total enterprise value and an attractive diversified mix of business lines

1 As of December 31, 2016 2 As of February 22, 2017 3 As of March 1, 2017. Enterprise Value taken from Nasdaq IR Insights. Business segment divisions from Scotia July 4,2016. 1.33 FX rate used to convert Brookfield Renewables

and Atlantic Power to CAD. See “forward-looking information”

TSX: ALA $CAD Common shares outstanding1 167 million Common share trading price2 $31.20 52-week trading range2 $35.55-$28.86 Market capitalization2 $5.2 billion Preferred shares2 $1.3 billion Net debt1 $3.9 billion Total enterprise value2 $10.5 billion Corporate credit rating S&P BBB DBRS BBB

5,000 10,000 15,000 20,000 25,000 30,000

$ Millions

Enterprise Value3

Utilities/Regulated gas distribution Power Midstream

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SLIDE 4

Construct, Own & Operate North American Energy Infrastructure

3

See "forward-looking information"

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SLIDE 5

Asset Management: Midstream, Power, Utilities

4

Energy infrastructure expertise:

Best in class operations: providing strong reliability and lower operating costs for customers Engineering, construction and procurement teams:

Over 200 years of major projects execution experience

$45 billion in major infrastructure projects constructed worldwide Key relationships: along the supply value chain to ensure quality and competitive pricing Well respected relationships with First Nations and Government: in project permitting, community consultations and outreach Committed to safety and the environment

Long-life energy infrastructure providing strong, stable and predictable returns to investors

See "forward-looking information"

Natural gas supply

Gas Processing/ Pipelines Gas/Renewable Power Generation Regulated Gas Distribution

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SLIDE 6

Regulated Gas Distribution ~36%

Well Diversified Energy Infrastructure

5

~2 Bcf/d of natural gas transacted Processing and moving natural gas and natural gas liquids to key markets including Asia 1,688 MW of power generation in four fuel types and 20 MW of energy storage2 Generating clean energy with natural gas and renewable sources 5 Regulated Gas Distribution franchises serving over 570,000 customers Delivering clean and affordable natural gas to homes and businesses

Segment normalized EBITDA1 (2017F)

~50%

Canadian normalized EBITDA Contribution1

~50%

U.S. normalized EBITDA Contribution1

~40% Contracted Power ~24% Highly Contracted Midstream

1 Expectations as at February 23, 2017, FX rate of C$1.33/US$1.00. Normalized EBITDA is a non-GAAP measure, see forward-looking infomration 2 Pomona Energy Storage

See "forward-looking information"

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SLIDE 7

200 400 600 800 2010 2011 2012 2013 2014 2015 2016 2017F $ Millions

Consistent and Diversified EBITDA1 Growth

6

Successful track record of delivering EBITDA1 growth over time

2010 2011 2012 2013 2014 2015 2016 2017F2 50% 43% 70% 69% 79% 93% 98% 96%

Non-commodity % of EBITDA1

1 Represents normalized EBITDA 2 Expectations as at February 23, 2017

2010 in accordance with CGAAP. 2011 and forward in accordance with U.S. GAAP See "forward-looking information"

High single digit growth

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SLIDE 8

2017F2

Contracted EBITDA1

7

1 Represents normalized EBITDA 2 Expectations as at February 23, 2017

2010 in accordance with CGAAP. 2017F in accordance with U.S. GAAP See "forward-looking information"

4% 34% 13% 29% 20%

Substantial increase in long-term contracted and Regulated Gas Distribution EBITDA

2010

Cost-of-service

  • Provides for recovery of operating costs and a

capital charge, generally are not subject to commodity risk

42% 17% 17%

Fixed / Take-or-pay

  • No volume or commodity price exposure

Frac Spread

  • Volume and price exposure
  • Approximately 57% of exposure is hedged in

2017

Breakdown of Midstream EBITDA1

Fee-for-service

  • Provides for a fee per unit of production sold or

service provided, generally are not subject to commodity risk

24%

Contracted PPA Midstream fee for service/TOP/cost of service Utilities/Regulated gas distribution Alberta power Frac Spread

~40% ~20% ~4% ~36%

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SLIDE 9

Cash Flow Supported by Long-Term Contracts

8

1 Chart and contract averages are the weighted average contract lengths based on TOP volumes (Midstream) or operating capacity (Power) 2 Regulated infrastructure with franchise agreements in each municipality that roll over regularly 3 Includes Harmattan co-stream, Younger, EEEP, JEEP, and PEEP (Weighted average based on expected yearly normalized EBITDA), expectations as at February 23, 2017

See "forward-looking information"

Power average ~14 years1 Take-or-pay average ~17 years1 Cost-of-service average ~13 years3

Average duration of contract (Years)

10 20 30 Hydro Wind Gas-fired Energy Storage Regulated Gas Distribution Townsend Gordondale BlairCreek Take-or-pay other Cost-of-service 60

2

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SLIDE 10

Frac Spread Sensitivities

9

Significant upside exposure to improving frac spreads

Extraction EBITDA sensitivities (annualized)

Index Frac Spread assumptions: Belvieu Propane Index = 46% WTI, Mont Belvieu Butane Index = 55% WTI, Edmonton Condensate Index = 100% WTI, AECO Gas = C$3.00/GJ, FX = C$1.33/US$1.00 Excludes any impact from current hedge position See "forward-looking information"

2,000 4,000 6,000 8,000 10,000 12,000 $0 $20 $40 $60 $80 $100 $120 $140 $160 $10 $15 $20 $25 $30 $35 $40 Bbls/d $ Millions Market Price Frac Spread C$/Bbl Commodity Exposed EBITDA Non-Commodity EBITDA C3+ Frac Exposed Production (left axis) (left axis) (right axis)

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SLIDE 11

10

Significant Energy Infrastructure Construction Expertise

See "forward-looking information"

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SLIDE 12

Capital Spending Plans

11

Maintenance capital for Gas and Power in 2017 expected to be approximately $25 - $35 million1

1 Expectations as at February 23, 2017 2 Includes one train and 2 liquids egress lines 3 Based on an FX rate of $1.33 4 Represents total capital costs of facilities, gas processing infrastructure expected to be jointly owned

See "forward-looking information“

($ Millions) Total capital spend1 Invested at December 31, 2016 Expected normalized EBITDA multiple1 Target in-service Project Status Midstream North Pine NGL separation2 Under construction $125 - $135 $4 8 - 9x 2018 North Pine NGL separation – Train 2 Development $50 - $60 8 - 9x 2019 Ridley Island Propane Export Terminal Under construction $450 -$500 $39 8 - 10x 2019 Townsend 2a Under construction $80 $5 8 - 10x 2017 Townsend incremental field compression equipment Under construction $40 - $60 8 - 10x 2017 Townsend 2b Development $90 - $100 8 - 10x 2018 Liquids storage / Terminalling Development $30 - $40 8 - 9x 2017 - 2018 Montney gas and liquids processing facilities4 Development $160 - $180 8 - 9x 2019 Alton gas storage Under construction $150 - $160 $69 9 - 11x 2020 Total Gas $1,175 - $1,315 $117 Power Pomona re-power3 Development $120 - $140 $2 8 - 10x 2019 Additional battery storage3 Development $100 - $110 7 - 8x 2018/2019 Blythe II (Sonoran)3 Development $600 - $650 $10 8 - 10x 2020 Total Power $820 - $900 $12 Regulated Gas Distribution Utilities capital 2017 - 2019 $400 - $450 2017 – 2019 Marquette pipeline3 Development $180 - $185 9 - 11x 2019 CINGSA expansion3 Development $25 - $40 9 - 11x 2020 Total Regulated Gas Distribution $605 - $675 Total $2,600 - $2,890 $129

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SLIDE 13

Expected on- stream Q1 2019 Potentially

  • n-stream

2019 Expected long term supply agreements with PPY f or portion of total capacity Expected to be f ully contracted with Painted Pony

Committed Projects Highly Contracted

12

~62% EBITDA growth from committed projects, projects in advanced development and growth in regulated Utilities1

1 Expectations for normalized EBITDA as at February 23, 2017, based on mid-point of multiple and capital spending range from Capital Spending Plans slide

See "forward-looking information"

  • n-stream

07/2016 Regulated stable returns in f av orable jurisdictions ~90% Take or Pay with Painted Pony 10 y ear ESA with SCE Fully contracted with Heritage Gas Expected on- stream 10/2017

  • n-stream

12/2016 Expected on- stream 2020 Expected on- stream Q2 2018 MOU with Astomos f or 50% of the of f take. Expect at least 40% of RTI throughput to be underpinned by tolling Potentially

  • n-stream

2018 Potentially

  • n-stream

2019 LOI with signif icant Montney producer acquired 11/2015 7 y ear PPAs with PG&E

  • n-stream

10/2015 60 y ear EPA with BC Hy dro

2015 San Joaquin acquisition Regulated Gas Distribution Mclymont Townsend Pomona Energy Storage Townsend 2a and incremental field compression Townsend 2b Alton North Pine North Pine II Montney Gas and Liquids Processing Facilities Ridley Island Propane Export Terminal 2020F

Targeting new producer

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SLIDE 14

Funding Outlook for 2017

13

1 Dividend reinvestment plan “DRIP” (Includes Premium dividend reinvestment plan “PDRIP”) 2 Assumes dividend held flat at $2.10 annually with 167 million shares outstanding. Expectations as at February 23, 2017

See "forward-looking information"

Well funded to support full capital program

Bank liquidity, Term debt, Preferred shares, Non-core asset sales, Partnerships Gas & Power Maintenance Capex

Dividends2 Uses

Projects

  • Ridley Island

Propane Export Terminal

  • North Pine NGL

Facility

  • Alton Gas Storage
  • Townsend 2a

Utilities Capex

Funds from

  • perations

DRIP1 Sources

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SLIDE 15

Power Portfolio

14

Assets provide long-term, stable cash flows; weighted average PPA term is 14 years3

1 Includes gas-fired, hydro, wind, and biomass fuel sources 2 Pomona Energy Storage 3 Based on operating capacity

See "forward-looking information"

4% 22% 74%

Alberta British Columbia U.S.

2% 74% 16% 7% 1%

Biomass Gas-Fired Hydro Wind Energy Storage

Our power assets generate 1,688 MW 100% from clean energy sources1 and we have 20 MW of energy storage2

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SLIDE 16

Northwest B.C. Hydro – Stable Long-Term Financial Returns

15

Forrest Kerr 195 MW fully contracted to 2074 McLymont Creek 66 MW fully contracted to 2075 Volcano Creek 16 MW fully contracted to 2074

  • 60 Year PPA with high quality credit

(BC Hydro)

  • 100% indexed to B.C. CPI
  • AltaGas as operator has excellent

track record

  • Minimal ongoing maintenance capital
  • Very high capacity factors translates

into low annual generation volatility

100 200 300 400 500 600 NWH 60-year EBITDA: CPI indexing can deliver significant growth CPI 1% CPI 1.5% CPI 2% CPI 2.5% $ Millions

See "forward-looking information"

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SLIDE 17

Attractive Clean Energy Footprint Diversified Across Northern and Southern California

16

Blythe

  • Large site
  • Working to extend the

existing PPA

  • Siemens gas turbine with

a heat rate in the range of 7,000 – 7,500 Btu/kWh US $642 million San Joaquin acquisition (Tracy , Hanford and Henrietta plants)

  • Delivers ~CAD $95

million in EBITDA on yearly basis

  • Fully contracted with

PG&E through to fourth quarter 2022

  • Important assets for

system reliability

  • Situated in load

constrained areas with lower resources adequacy

  • Higher locational

marginal pricing

  • Tracy is a 7EA gas

turbine with a heat rate of 7,770 Btu/kWh

  • Hanford and Henrietta

are LM6000 with heat rates of 10,100 Btu/kWh

Utilities

Blythe – 507 MW Tracy – 330 MW

Power

Hanford – 97 MW Henrietta – 96 MW

See "forward-looking information"

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SLIDE 18

California Power Portfolio - Summary

17

Blythe Energy Project

  • SCE future requirements

Retirements of merchant gas plants continue due to low energy and capacity prices

SCE is on record as saying they w ill need gas generation resources in the 2018 – 2020 time frame

Gas-fired pow er plants w ith “steel in the ground” w ill have increasing value

  • Pursuing other customers for Blythe post-2020

Optimize Blythe’s transmission options to reach new customers in California, Arizona, Nevada and New Mexico

Blythe can be coupled w ith a renew able energy project and marketed as a “Bucket 2” resource, defined as a firmed and shaped r enew able energy product

  • Reconnecting to El Paso natural gas supply

Provides redundancy and flexibility in operations at a low cost

Sonoran Energy Project

  • Development of Sonoran investment has value for solar developers in the Blythe area

Sonoran Large Generator Interconnection Agreement (“LGIA”) is a valuable asset given its position in the Interconnection Queue along w ith its point of interconnection

In discussions w ith utility scale renew able developers to establish a partnership

Pomona

  • Additional potential battery project
  • Gas re-powering application under review by the California Energy Commission

100 MW fast ramping LMS100 technology to complement renew ables

Other development opportunities (storage, gas, solar)

All of our California sites can accommodate incremental battery storage projects (1,300 MW in RFPs by 2020)

Ripon RFP for battery storage

Arizona sites under review for solar (couple offering w ith Blythe)

See "forward-looking information"

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SLIDE 19

1 Based on public data and AltaGas assumptions as at June 30, 2016. Total retirements of ~14,700 MW. Estimates may vary depending on source used 2 Based on energy storage procurement targets from SCE, PG&E and SDG&E for 2016-2020. Total of approximately 1,300 MW.

See "forward-looking information"

Supply reductions bring about tightening reserve margins resulting in upward pressure on Resource Adequacy prices and energy prices in California

Significant California Supply Reductions May Put Upward Pressure on Prices

(16,000) (12,000) (8,000) (4,000)

  • 4,000

Coal imports loss OTC plant retirements Nuclear retirements Gas new builds Additional Energy Storage Net Cumulative Capacity Decrease California non-renewable capacity (MW)

Near-term retirements of non-renewable resources not being replaced in kind (2016 - 2024) 1

2

18

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SLIDE 20

1 Draft Manual 2016 Local Capacity Technical Study, California Independent System Operator, October 2014

See "forward-looking information"

Existing Permitted Gas Plants in California Have Embedded Value Which Can Grow Over Time

High barriers to entry for new gas generation. Steel in the ground has significant value

  • New builds are difficult to permit, expensive to build and require long (~10 year) development time
  • horizons. There are no new gas plants under construction in the densely populated San Francisco

region.

  • High demand drives premium pricing in these constrained load pockets - a key value driver for

existing facilities in these regions.

  • Tracy, Hanford, Henrietta and

Ripon are all located in the San Joaquin Valley region east and south of San Francisco

  • Pomona is in the LA Basin load

pocket

CAISO Local Constrained Areas1 San Francisco Los Angeles

19

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SLIDE 21

Pomona: Energy Storage Complementary To Gas-Fired Capacity

20

Battery Storage

  • 10 year Energy Storage Agreement (ESA) with

Southern California Edison (SCE) for 20 MW energy storage at Pomona facility

  • Resource adequacy capacity for four hour period,

equivalent of 80 MWh of energy discharging capacity

  • Commercial operations date: December 31, 2016
  • Delivered on-time and on-budget
  • Energy storage is complementary to gas-fired

capacity at Pomona

Other Battery Storage Opportunities

  • Three largest California utilities mandated to acquire

~1,300 MW in storage capability by 2020

  • RFP’s currently underway, and more expected

through 2017 – AltaGas expects to win more contracts

  • Existing infrastructure at AltaGas’ California facilities

is an advantage over greenfield projects

As at February 23, 2017 See "forward-looking information"

Pomona Energy Storage – Quick Facts

  • The industry’s fastest project completion to date,

deployed 20 MW in less than four months

  • 10,800 sq. ft. facility includes 12,240 batteries
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SLIDE 22

Market opportunities for AltaGas' California Assets

Well Positioned in California

21

See "forward-looking information"

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SLIDE 23

System betterment program and upgrades underway at Utilities

Delivering Clean and Affordable Energy

22

1 Expectations as at February 23, 2017; assumes CAD/USD at 1.33

See "forward-looking information"

5 Gas Distribution Utilities1: Serving over 570,000 customers; 22% Canada; 78% US Rate base: ~$1.9 billion1

SEMCO

  • Main replacement program (MRP) continues to 2020 with

associated average spend of ~US$10 MM annually

  • MRP-1 was first of its kind granted by Michigan

regulator in 2011

  • Since 2011, SEMCO has amended the MRP twice,

with current MRP-3 approved June 2015

  • Full expectation of continued extensions into

foreseeable future beyond 2020 ENSTAR

  • Replacing existing pipelines and stations, meters and

encoder receiver transmitters. Main expansions to enhance redundancy and back-feeds. Bringing all valves above ground.

  • Expansion to communities such as Houston, Willow and

Seward. AUI

  • The 2016-17 capital tracker program was substantially

approved by the AUC with over $60 million in capital additions related to pipe replacement, station refurbishment and gas supply investments.

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SLIDE 24

Capital Spend in Regulated Gas Distribution: 2017 – 2021

23

~$450 million increase in rate base over the next five years1

Historical and forecast rate base growth of 4% - 7%1,2

1 Expectations as at February 23, 2017 2 Excludes the impact of FX, using 2012 as a base year

See "forward-looking information"

2017F 2020F 2021F 2018F 2019F $ Millions 100 200 300 400 500 600

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SLIDE 25

Michigan Growth Opportunity

 The MCP is a proposed new pipeline that will connect the Northern Natural Gas pipeline to the Great Lakes Gas Transmission Company and, in addition, will extend to Marquette, Michigan.  The MCP will provide needed redundancy and additional supply options to SEMCO’s 35,000 customers in its service territory in Michigan’s Western Upper Peninsula. It will also provide additional natural gas capacity to Michigan’s Upper Peninsula to allow for growth.  The cost of the MCP is estimated at approximately $180 - $185 million. Recovery on MCP is expected to be through a general base rate case.  Filed an Act 9 application with the Michigan Public Service Commission in December 2016 seeking approval to construct,

  • wn and operate the project. A decision is expected in Q4 2017, followed by development in 2018, construction in 2019, and
  • n-stream in 2020.

Marquette Connector Pipeline (MCP)

See "forward-looking information“ Expectations as at February 23, 2017

24

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SLIDE 26

Supportive Regulatory Environment for Regulated Gas Utilities

25 Utility Location Allowed ROE and Equity Thickness Regulatory

British Columbia 9.40%1 45%

  • Next rate case to be filed Q4 2017 for 2018 and 2019
  • Protected from weather related volatility through revenue stabilization adjustment

account

Alberta 8.30% 41%

  • Operate under Performance-Based Regulation, 2013-2017 current term. Next

generation PBR (2018 – 2022) under review

  • ROE rising to 8.5% in 2017
  • Cost recovery and return on rate base through revenue per customer formula
  • Additional recovery and return on rate base through capital tracker program

Nova Scotia 11% 45%

  • No regulatory lag; earn immediately on invested capital
  • Distribution rates have been held steady since January 1, 2014
  • Customer Retention Program approved in September 2016 results in a decrease in

distribution rates for primarily commercial customers

Michigan 10.35% 49%

  • Use of projected test year for rate cases with 12 month limit to issue a rate order,

eliminates/reduces regulatory lag

  • Recovery of invested capital through the Main Replacement Program surcharge has

reduced the need for frequent rate cases

  • Last rate case filing completed in 2010; next case to be filed in 2019
  • Act 9 filing completed in December 2016 with the Michigan Public Service

Commission towards approval and construction of the Marquette Connector Pipeline

Alaska 12.55% 51.70%

  • 2014 rate case was settled in 2015 with rate increases effective October 1, 2015 and

January 1, 2016

  • 2016 rate case filed June 1, 2016, with interim rates approved in July 2016 and final

rates expected to be set in Q3 2017

Alaska 12.55% 50.00%

  • Rate case will be filed in Q3 2017 based on 2016 historical test year

1 Approximate average between PNG and PNG NE

See "forward-looking information"

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SLIDE 27

Building Infrastructure to Serve New Markets

26

1 Ferndale Terminal operated by AltaGas 2 Includes Petrogas operations

See "forward-looking information"

Ridley Island Propane Export Terminal (RTI) New storage, rail, pipeline & truck offloading Extraction, processing & liquids separation Rail, truck & pipelines2

RAW GAS

NGL

Fort Sask. hub2

North Pine NGL facility and other new processing infrastructure & liquids separation

Ferndale Terminal1 (Exports commenced in 2014)

From wellhead to markets

North American Markets Asian Markets Storage, rail & truck offloading2 Abundant natural gas Existing assets Growth projects

  • Petrogas
  • Ferndale
  • RTI

LOGISTICS

  • Astomos
  • Idemitsu
  • Other third

parties END MARKETS

  • Younger
  • Harmattan
  • Blair Creek
  • Gordondale
  • Townsend

PROCESSING / FRAC

  • North Pine
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SLIDE 28

2016 Gas segment normalized EBITDA Townsend (2016) Townsend 2a and incremental field compression (2017) Townsend 2b (2018) Liquids storage & terminalling (2018) North Pine Facility (2018) North Pine Facility - Train 2 (2019) Montney Gas and Liquids Processing Facilities (2019) Ridley Island Propane Export Terminal (2019) Alton gas storage (2020) 2020E Gas segment normalized EBITDA

Growing our Gas Segment

27

Contribution from Gas segment expected to increase to 34% of consolidated normalized EBITDA as growth projects come into service

1 Expectations as at February 23, 2017, 2 EBITDA assumptions based on mid-point of Capital Spend and EBITDA multiple included in slide titled “Capital Spending Plans” 3 Assumes all projects under development in slide titled “Capital Spending Plans” are in operation for 2020

See "forward-looking information"

22% of corporate normalized EBITDA1 ~34% of corporate normalized EBITDA3 2016

Gas projects currently under development drive segment growth of ~100% in normalized EBITDA2

20201,3

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SLIDE 29

Stable Production Volumes & Throughput

28

Blair Creek

2015 – 62 Mmcf/d 2016 – 66 Mmcf/d 2017E – 65 – 70 Mmcf/d

Gordondale

2015 – 102 Mmcf/d 2016 – 90 Mmcf/d 2017E – 90 – 100 Mmcf/d

Harmattan

2015 – 114 Mmcf/d 2016 – 109 Mmcf/d 2017E – 110 – 120 Mmcf/d

Younger1

2015 – 253 Mmcf/d 2016 – 290 Mmcf/d 2017E – 285 – 295 Mmcf/d Other FG&P 2015 – 100 Mmcf/d 2016 – 90 Mmcf/d 2017E – 90 – 100 Mmcf/d

2017F FG&P: 434 Mmcf/d *‡ 2017F extraction: 0.95 - 1.05 Bcf/d

1 Volumes net to AltaGas 2 Expectations as at February 23, 2017

* All or large majority of volumes are take-or-pay commitments **2014-2015 total volumes exclude 2015 average volumes for assets sold to Tidewater. Acme, Ante Creek and ECNG sold in 2014 See "forward-looking information"

Mmcf/d

High grade asset base with core plants in sustainable plays that drive growth

400 800 1,200 1,600 2014 2015 2016 2017 F

Gross Annual Throughput

Other Extraction Harmattan raw gas processing Harmattan take or pay Other FG&P** Gordondale * Blair Creek * Townsend *

2

10,000 20,000 30,000 40,000 2014 2015 2016 2017F

Extraction Volumes

C2 Produced Non-commodity exposed C3+ Exposed C3+ Bbl/d

2

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SLIDE 30

0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 $US/mmbtu

$7.17 - $8.27

Montney Competitive at Current Prices

29

Montney became most active upstream Canadian oil and gas play in 2015, with 28% of all industry wells drilled and 53% of total industry drilling capital

Note: 15% Btax IRR, assumes $US0.83 = $CDN1.00, US$0.75/mmbtu AECO basis 20:1 liquids:gas ratio; reflects 10% capital cost variation Source: geoSCOUT, RBC Capital Markets estimates, RBC report September 13, 2016

2 Henry hub pricing US$2.63/mmbtu as at March 3, 2017

See "forward-looking information"

Henry Hub Price2 NYMEX (US$/mmbtu) Reflects variation in capital inputs

slide-31
SLIDE 31

Painted Pony Strategic Alliance

30

Significant underlying value with continued growth in proved plus probable reserves to 4.9 Tcfe at December 31, 2016

  • Townsend Facility anchor tenant with 20 year take-or-pay

agreement

  • Low cost producer2

Best in class F&D costs in 2016 ($0.57/Mcfe 1P)

24% decrease in per unit cash operating costs in 2016

2016 corporate netback margins $1.73/Mcfe

  • Current production rate exceeding 240 Mmcfe/d2
  • Reserves support multi-year drilling program and future

growth

  • Highly efficient drilling performance in 20163

Low well costs of $4.55 million per well

Top well performance of ~9 Bcfe estimated ultimate recovery per well

  • Firm transportation capacity totaling 580 MMcf/d in Dec.

2018

Exposure to Station 2 spot pricing reduced to less than 14% of forecasted natural gas production

  • Solid financial position

2016 net debt of $228.5 million (70% of capacity)2

Meaningfully hedged production in 2017 (75%)

1 From NBF Oil & Gas Weekly WTI Closes at Highest Level in Two Months Energy Compsheet March 7, 2016 2 Source: Painted Pony 2016 Annual Report. Reflects half cycle costs 3 Source: Painted Pony January 2017 Investor Presentation.

See "forward-looking information"

1 2 3 4 5 6 7 Senior Intermediate Yield Intermediate Junior Average Average Canadian Producers' Gas 2P Reserves1 Gas 2P Reserves

Tcfe

Painted Pony 2P Reserves

slide-32
SLIDE 32

Export Solution to Enhance Producer Netbacks

31

AltaGas’ strategy will allow producers to move natural gas and natural gas liquids to multiple markets AltaGas is poised to create a hub for new markets to the west AltaGas plays a part in the Fort Saskatchewan traditional gas hub – moving gas to the east

Historical C3 Prices

Younger + JEEP + EEEP + PEEP: >11,000 bbl/d (C3+) South Montney + Deep Basin Frac: ~20,000 bbl/d of C3+ >40,000 bbl/d

  • f C3 shipped

to Asia North Pine: ~20,000 bbl/d of C3+

Blair Creek North Pine Facility Younger Truck Terminal

Expectations as at February 23, 2017 See "forward-looking information"

slide-33
SLIDE 33

Straddle Spec Exports Exported as Mix

25 50 75 100 125 150 Supply Demand

Western Canada has Excess Supply of Propane

32

  • Western Canada produces

approximately 150,000 bbl/d of propane – the majority comes from field production, fractionation, and straddle plants

  • Regional demand is only 25,000

bbl/d

  • Traditional export markets have

been to Eastern Canada and Midwest US

Mbbl/d

Total exports from WCSB Field Production and Frac Refinery Regional Consumption

See "forward-looking information"

slide-34
SLIDE 34

Clear LPG Shipping Cost Advantage to Asia

33

Prince Rupert

  • Ft. Saskatchewan
  • Mt. Belvieu

Rail Cost

Via RIPET Via Gulf Coast Rail Included $0.25 - $0.30 Terminal Included $0.05 - $0.10 Shipping Included $0.10 - $0.20 Total Costs $0.30 - $0.40 $0.40 - $0.60 WCSB to Asia Costs (US$/Gal) Via RIPET Japan Price less $0.30 to $0.40 Via Gulf Coast Japan Price less $0.40 to $0.60 RIPET Premium $0.10 - $0.20 WCSB Netbacks (US$/Gal)

25 days 10 days

Terminal Cost Ocean Freight Cost

(Includes Canal Fee)

Rail Cost Terminal Cost Ocean Freight Cost

Japan / Korea 1 Demand: Supply: North America 1 Demand: Supply:

1 Shipping time as per Idemitsu

RIPET stands for Ridley Island Propane Export Terminal See "forward-looking information"

slide-35
SLIDE 35

Doubling the Townsend Gas Processing Complex

34

  • 198 Mmcf/d shallow-cut natural gas processing

facility enhanced with logistical infrastructure and gathering systems

  • ~$430 million Townsend midstream complex

including processing plant, gathering line, liquids egress lines, and truck terminal completed ~$40 million under budget

Processing plant alone: best in class construction cost at ~$1.00 - $1.25 million per Mmcf

  • 2017F EBITDA of ~$40 – $50 million1
  • 20-year take-or-pay with Painted Pony

1 Expectations as at February 23, 2017

See "forward-looking information"

  • Townsend Phase 2 will be constructed in two

separate gas processing trains

  • The first train (2a) will be a 99 Mmcf/d shallow-cut

natural gas processing facility located on the existing Townsend site

Expected commercial on-stream date is October 2017

Expected to be fully contracted under a 20-year take

  • r pay with Painted Pony

Estimated cost for the first train is $80 million

Total spend for the first train and additional infrastructure is estimated to be $120 to $140 million

  • The second train (2b) is under development with a

target on-stream date later in 2018

Townsend phase 1 - Completed July 2016 Townsend phase 2:

Received regulatory approval for the doubling of the Townsend Facility to 396 Mmcf/d and to retrofit the existing 198 Mmcf/d shallow-cut Townsend Facility to a deep-cut facility at a future date

slide-36
SLIDE 36

North Pine NGL Facility to Serve Montney Producers

35

  • Positive final investment decision announced on

October 20, 2016

  • NGL facility to serve Montney producers in northeast

British Columbia, near Fort St. John

  • Site preparation for the first NGL separation train is

underway, with expected on-stream date in Q2 2018

  • First train capable of producing up to 10,000 Bbls/d of

C3+ processing capacity, with capacity of 6,000 Bbls/d

  • f C5+
  • Two NGL supply pipelines will be constructed

connecting the existing Alaska Highway truck terminal to the facility

  • Well connected by rail to Canada’s west coast

including the proposed Ridley Island Propone Export Terminal

  • Permit from the BCOGC to construct, own and operate

the North Pine Facility was issued on September 23,

  • 2016. On December 16, 2016, permit was issued for

the construction of the North Pine Pipelines

  • Expected to be backstopped by long-term supply

agreements with Painted Pony for portion of total capacity

  • Estimated cost of first stage: ~$125 to $135 million1,2

1 Includes first train and two liquids supply lines 2 Expectations as at February 23, 2017

See "forward-looking information"

slide-37
SLIDE 37

Montney Gas and Liquids Processing Facilities

36

  • Entered into a non-binding letter of intent with a

significant Montney producer on January 20, 2017 and expect definitive agreements to be completed in Q1 2017

  • Natural gas processing facility capable of processing

120 Mmcf/d of natural gas and NGL separation train capable of processing up to 10,000 Bbls/d of NGL mix

  • Located in another area of the Montney separate from

AltaGas’ current operations, increasing geographic and customer diversification

  • Expected to have access to CN rail network allowing

for transportation of propane to the Ridley Island Propane Export Terminal

  • The deep-cut processing facility is projected to cost

approximately $100 - $110 million and is expected to be jointly owned

  • The NGL separation train and rail terminal are

expected to cost approximately $60 - $70 million and be fully owned by AltaGas

  • Deep-cut processing facility is expected to be

underpinned with long-term take-or-pay and dedication commercial agreements

  • Subject to regulatory approvals, expected to be on-

line in early 2019

Expectations as at February 23, 2017 See "forward-looking information"

slide-38
SLIDE 38

Ferndale Continues to Surpass Expectations

37

  • The only existing and operating LPG

export terminal on the west coast of North America, located in Washington state

  • 750,000 barrels of on-site storage

capacity

  • Target shipments of 50% propane and

50% butane

  • Record product movements in 2016
  • Operated by AltaGas
  • Contracted off-take arrangements

Expectations as at February 23, 2017 See "forward-looking information"

slide-39
SLIDE 39

Canada’s First West Coast Propane Export Terminal

38

Expectations as at February 23, 2017 See "forward-looking information"

Ridley Island Propane Export Terminal

  • On January 3, 2017, AltaGas declared a positive FID to

proceed with construction, ownership and operation of the Ridley Island Propane Export Terminal

  • Brownfield site includes existing world class marine jetty with

deep water access, excellent railway access and short shipping distance to Asian markets

~10 day vs. ~25 days from the U.S. Gulf Coast

  • Astomos Energy Corporation to purchase 50% of the

propane shipped from the facility

Commercial discussions continue with Astomos and

  • ther third-party off takers for further capacity

commitments

  • Exports of up to 40,000 Bbls/d

~50% of propane to be supplied from existing AltaGas facilities and forecasts from new plants under construction and in active development; remaining 50% to be supplied by producers and aggregators in western Canada

Expect at least 40% of the facility’s throughput to be underpinned by tolling arrangements

  • Third party has the option to take an equity position of up to

30% in the project

  • $450 - $500 million project with expected on-stream date of

Q1 2019

slide-40
SLIDE 40

Cash Common Share Dividend (Net of DRIP / PDRIP)1 ~$120 million

Utilities Funds from Operations3 $210 - $220 million

Northwest BC Hydro Funds from Operations

3

$85–$90 million Preferred Share Dividend ~$60 million $0 $50 $100 $150 $200 $250 $300 $350 Dividends Sources of Dividend Payment ($ Million)

$295 - $310 million $180 million

Delivering Stable Predictable Dividends

39

1 Dividend Reinvestment Plan and Premium Dividend Reinvestment Plan - Assumes dividend of $2.10 annually with 167 million shares outstanding 2 Expectations as at February 23, 2017 3 Normalized FFO is a non-GAAP measure, see forward-looking information

See "forward-looking information"

Dividends more than fully underpinned by regulated utilities and 60-year contracts on Northwest Hydro Facilities

slide-41
SLIDE 41

11% 44% 45% Preferred Common Net Debt

Sound Financial Position

40

1 Expectations as at February 23, 2017

See "forward-looking information"

Manageable capital structure

(December 31, 2016)

Executed financing history1

Covenants

0% 10% 20% 30% 40% 50% 60% 70% 80% 2011 2012 2013 2014 2015 2016

Debt-to-Capitalization

0 x 1 x 2 x 3 x 4 x 5 x 6 x 2011 2012 2013 2014 2015 2016

EBITDA-to-interest expense

Covenants: No less than 2.5 x

500 1,000 1,500 2,000 2,500 2011 2012 2013 2014 2015 2016 2017 $ Millions Common Equity Preferred Equity Debt Free Cash Flow DRIP

slide-42
SLIDE 42

Delivering Growth and Security

41

Payout ratio balances company growth and investor return and positions ALA for further dividend growth

1 2010 in accordance with CGAAP. 2011 and forward in accordance with U.S. GAAP 2 Dividends paid as a percentage of FFO. 3 NBF Energy Infrastructure, December 19, 2016, company reports and ALA estimates as of February 23, 2017, AFFO equals FFO adju

sted for gas and power maintenance capital, preferred share dividends and non-controlling interest See "forward-looking information"

Dividend growth Dividend payout1,2

Average Represents difference between AFFO and FFO payout ratio 49% 51% 46% 42% 45% 55% 57% 2010A 2011A 2012A 2013A 2014A 2015A 2016A $1.32 $1.38 $1.44 $1.53 $1.77 $1.98 $2.10 2010A 2011A 2012A 2013A 2014A 2015A 2016A

8% CAGR 0% 20% 40% 60% 80% 100%

Dividend payout as a % of 2017F AFFO

3

slide-43
SLIDE 43

VSN NPI ATP TA INE BLX GEI VNR PPL IPL CPX FTS BEP AltaGas EMA TRP ENF AQN KEY CU ENB ACO.X

0% 2% 4% 6% 8% 10% 12% 0% 5% 10% 15% 20%

Valuation Multiple

42

Attractive value for AltaGas, combined with sustainable dividend payment

Energy infrastructure group yield and growth2

2-Year Dividend CAGR through 2017

1 TD January 27, 2017 and company data. Veresen data from NBF January 31, 2017 report. Expectations as at February 23, 2017 with the dividend increase included, announced on July

21, 2016. AFFO equals FFO adjusted for gas and power maintenance capital, preferred share dividends and non-controlling interest

2 BMO July 14, 2016 and company data. Expectations as at October 19, 2016 with the dividend increase included, announced on July 21, 2016

See "forward-looking information"

Yield

AltaGas Enbridge Enbridge IF Gibson Inter Pipeline Keyera Pembina TransCanada Veresen

6 x 8 x 10 x 12 x 14 x 16 x 18 x

40% 50% 60% 70% 80% 90% 100% 110% 120% P/AFFO/Sh AFFO Payout Ratio

2017F Payout Ratios vs. P/AFFO1

slide-44
SLIDE 44

Key takeaways

43

Commitment to maintaining balanced long-term mix across 3 business lines Strong customer focus

  • Committed to lowering costs and unlocking value for producers
  • Proven track record of optimizing, debottlenecking and adding new lines of business to existing

facilities

  • Collaborative approach

Strong business profile

  • Diversified geographically and by business
  • Strong execution on organic growth projects
  • Business strategy focused on growing assets with stable / contracted profiles

Strong financial profile

  • Expect approximately high single digit normalized EBITDA and normalized FFO growth in 2017
  • Disciplined financing strategy with strong access to capital markets
  • Strong liquidity position and debt maturity profile

Well positioned for 2017 and beyond

Expectations as at February 23, 2017 See "forward-looking information"

slide-45
SLIDE 45

Appendix

44

slide-46
SLIDE 46

Creating Shareholder Value

45

Proven track record of counter cyclical moves and unique transaction structuring to create shareholder value

WGL (2017/2018) – announced transformational acquisition to grow all 3 business lines in the U.S. (expected close Q2 2018) Pomona Energy Storage (2016) – early mover with one of the largest battery storage projects to date in North America Tidewater (2016) – relationship designed to optimize asset base and enhance value for customers and shareholders Blythe (2013) and GWF (2015) – California market entry to capture attractive long-term fundamentals NW Hydro Projects (2015) – 60 year indexed PPA; greenfield to help develop NW B.C. Painted Pony (2014) – uniquely structured midstream relationship in high growth Montney play Ferndale (2014) – acquisition from a Major; increased capacity and volume throughput Petrogas (2013) – private company; unique ownership partnership; synergies given large North American footprint SEMCO (2012) – attractive U.S. franchise acquired before peak rate base multiples PNG (2011) – strategic value not being recognized in valuation multiple Bear Mountain (2010) – largest wind farm in B.C.; one of company’s largest greenfield projects at the time; value of PPA Heritage Gas (2009) – greenfield franchise with significant built-in growth Taylor (2007) – synergistic acquisition in core business; acquired before peak midstream valuations AltaGas Utility Group Inc. (AUGI) (2005, 2009) – spin-out and repurchase Enron PPA (2001) – near bankruptcy; attractive value and acquired at outset of market deregulation AUI acquisition (1998) – niche franchise in growing market; good value; below the radar screen of the incumbents

See "forward-looking information"

slide-47
SLIDE 47

Key Sensitivities

46

Foreign Exchange Key variables +/- $0.05 US/CAD 2017 Impact EBITDA ~$15 MM Frac Spread Key variables +/- $1/bbl 2017 Impact EBITDA ~$1.5MM Natural Gas Volumes Key variables +/- 10% 2017 Impact EBITDA ~$15 MM

Expectations as at February 23, 2017 See "forward-looking information"

slide-48
SLIDE 48

Strong Track Record of Growth

47

2007 to 2010 in accordance with CGAAP. 2011 and forward in accordance with U.S. GAAP See "forward-looking information"

100 200 300 400 500 600 700 800 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 Normalized EBITDA

$ Millions

100 200 300 400 500 600 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 Normalized Funds From Operations

$ Millions

slide-49
SLIDE 49

Debt Maturities

48

*Moody’s rating, not rated by S&P ** Negative outlook by S&P

1 TD Securities February 17, 2017

See "forward-looking information"

Balanced long-term debt maturities 10-year new issue spread1

Spread (bps) $ Millions 100 200 300 400 500 600 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2032 2044 ALA SEMCO PNG 50 100 150 200 250 300 350 400 450 500 Utility Average Energy Infrastructure Average Power Generation/Renewable Energy Average

~286 ~177 ~151

slide-50
SLIDE 50

Extraction and FG&P Asset Summary

49 Plant Contract type Net Capacity (Mmcf/d) 2017F Inlet (Mmcf/d) Extraction Harmattan (raw gas) Fee for service 490 110 – 120 Harmattan (co-stream inlet) Cost of service 235 – 245 Younger Frac Exposed 425 285 – 295 PEEP Frac Exposed 135 125 – 135 EEEP 50% Cost of service / Fee for service 50% Frac Exposed 390 130 – 140 JEEP 50% Cost of service 50% Frac Exposed 250 110 – 120 Total Extraction 1,690 995 – 1,055 FG&P Gordondale Take or pay 150 90 – 100 Blair Creek Mix of Take or pay and Fee for service 83 65 – 70 Townsend Take or pay 198 155 – 165 Other FG&P (~30 facilities) Mix of Take or pay and Fee for service 341 90 – 100 Total FG&P 772 400 – 435

Expectations as at February 23, 2017 See "forward-looking information"

slide-51
SLIDE 51

Market Overview in California

50 California ISO (CAISO) oversees the operation of California’s power grid, managing:

  • Day-ahead: Clearing bids, procure reserves,

and managing congestion

  • Real-time: 5 minute locational marginal

pricing market – Utilities buy power to meet any increments of demand not covered in day- ahead

  • The California market has one of the most

progressive Renewables Portfolio Standards (RPS) of 50% by 2030

  • Increasing supply from these intermittent

resources sets stage for system volatility and peaking needs

  • Natural gas and imports continue to be the

largest sources of energy in California with 40%

  • f energy coming from natural gas and 28%

from net imports

  • High cost of new build and barriers to entry add

value to current assets

Source: California ISO – Managing an evolving grid, Transitioning to a low carbon future See "forward-looking information"

Energy Imbalance Market (EIM): Part of the real time market, the EIM is expanding the border of the traditional CAISO market. The number of participating utilities is expected to grow

slide-52
SLIDE 52

Resource Adequacy in California

51 Resource Adequacy (RA): Ensures adequate physical capacity is in existence to serve likely peak load and provide reliability Load Serving Entities (LSEs, power provider to an end user) are required by the California Public Utilities Commission (CPUC) to procure RA to ensure adequate capacity is available on the California grid Key drivers of RA market include significant retirements due to once-through cooling regulations, planned retirements of nuclear, and increasing reliance on intermittent resources such as solar and wind As California moves to 50% RPS, RA prices are expected to increase on gas generation that is available 24/7

Source: California ISO – 2015 Annual Report on Market Issues & Performance See "forward-looking information"

slide-53
SLIDE 53

Renewables are intermittent, non-dispatchable and have a low capacity factor

Changing California Supply Mix Results in Market Imbalance and Instability

1 Based on public data and AltaGas assumptions as at June 30, 2016. Estimates may vary depending on source used 2 California Independent System Operator

See "forward-looking information"

Sample net load – March 312

  • Over-generation of renewables during non-peak parts
  • f the day. Peak day capacity requirements (early

AM, PM) have not been reduced by this increase

  • Duck curve is becoming more extreme requiring

13,000 MW of fast ramping capacity between 4 and

  • 6pm. This is increasing system instability
  • Load serving entities need to manage additional

renewables on their system by filling in generation requirements on the duck curve – increasing the importance of flexible, fast ramping gas-fired capacity

Fuel Mix1

0% 20% 40% 60% 80% 100% Hydro Nuclear Coal and oil Gas Solar Other

52

Net load of 12,546 MW

  • n April 24, 2016

Actual 3-hour ramp

  • f 10,892 MW on

February 1, 2016 Hydro, 13% Nuclear, 3% Coal and Oil, 1% Gas, 56% Solar, 13% Other, 13%

Capacity 20162

slide-54
SLIDE 54

Well situated location

  • Large acreage ideal for combined offering of gas, solar and energy

storage

  • Blythe is ½ the cost of a new build gas plant and has value as a

system resource

  • Low load turndown adds additional downward ramping capability

which is needed by CAISO

Future economic value opportunities

1. Contracting options include:

  • Recent and expected PPAs with California and Desert

Southwest (DSW) utilities

  • Bilateral multi-year capacity agreements with utilities,

corporations, and municipalities throughout southern California 2. In addition, Resource Adequacy (RA) market prices are expected to increase over next 5 years and would be an economic

  • alternative. Would likely involve shorter-term contracts but with a

wider variety of counterparties including large corporations 3. Combined energy / ancillary service offering potential. Requirements to support renewables means combined pricing could exceed RA prices and approach PPA prices

Blythe and Sonoran Development Potential

Optionality to deliver to growing markets in Desert Southwest (DSW)

  • Transmission adds optionality to serve CAISO as well as Arizona,

Nevada and New Mexico (WAPA)

  • Significant coal and utility capacity being retired in neighbouring

states

  • Transmission can also go directly to the IID

Blythe I Sonoran

53

See "forward-looking information"

slide-55
SLIDE 55

Ramping Requirements

54

Deviations in load, wind, and solar increase the total mileage needed

  • ver the three hour ramp. Large single hour ramps make up a significant

portion of the overall 3 hour net load ramp

CAISO Load Forecast for March 13, 2017 Required MW for the 3 Hour Ramp = 9,194 MW However, due to ever changing loads and generation, the total MW mileage (or MWs needed up and down) over 3 hours is 17,523 MW 9,194 MW (Difference between low and high range)

30,000 28,000 26,000 24,000 22,000 20,000

MWs Time – 5 Minute Intervals

6 11 16 21 26 31 36 41 46 51 56 61 66 71 76 81 86 91 96 101 106 111 116 121 126 131 136 141 146 151 156 161 166 171 176 181 186 191 196 201 206 211 216 221 226 231 236

18,000

See "forward-looking information"