Time of Use Analysis Delivered Water y 9/23/2014 rWave.pptx - - PDF document

Delivered Water Time of Use Analysis y

9/23/2014

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As part of the Cost of Service analysis, alternative rate structures were reviewed alternative rate structures were reviewed

• AHFC recommended that the discussion of DWS

Time of Use rates is more appropriate for the WQOPS Committee

• Objective of rate restructure would be to increase

recycled water deliveries through cost of service based discounts based discounts

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The Agency has available capacity to increase recycled water deliveries increase recycled water deliveries

• Quick analysis of 2013 demands reveals:

Q y

– Nighttime

• DWS demand is lowest between midnight and 5 am

– Sundays

• Deliveries are lower than other days of the week
• Unused flows results in roughly 4 mgd to outfall
• Unused flows, results in roughly 4 mgd to outfall

– Shoulder Months

• System is underutilized during 8 months of the year

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y g y

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Annual demands illustrate a variety of peaks and lulls peaks and lulls

35 25 30 Daily)

Sharp drops reflect Sunday deliveries Low demands

15 20 et Demand (D

Sunday deliveries Low demands during non-peak irrigation season

5 10 Acre-Fee

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• /2013

/2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 /2013 6/2013 7/2013 /2013 /2013 /2013

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1/1/ 1/12 1/23 2/3/ 2/14 2/25 3/8/ 3/19 3/30 4/10 4/21 5/2/ 5/13 5/24 6/4/ 6/15 6/26 7/7/ 7/18 7/29 8/9/ 8/20 8/31 9/11 9/22 10/3 10/14 10/25 11/5 11/16 11/27 12/8 12/19 12/30

Cost of service based incentives can be provided based on a number of factors provided based on a number of factors

– Nighttime Rates g

• Reflect the cost of cheaper “off-peak” electric rates

– Sunday Rates

• Incentive to utilize the system to its full capacity

– Shoulder Season Rates.

• Incentive to utilize the system to its full capacity
• Incentive to utilize the system to its full capacity
• Potential for cost avoidance

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Rates can be designed to efficiently use the system at a benefit to all users the system at a benefit to all users

Peak users are paying for

Peak usage ity

Peak users are paying for unused capacity year round.

em Capaci Base usage Syste

To incentivize demands, lower prices can be

• ffered at a marginal cost – as the peak users will

support fixed expenditures

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Annual Water Demand

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Ni htti D li i Nighttime Deliveries

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Hourly GPM demand for June 3 2013

10000 8000 9000 5000 6000 7000 3000 4000 6/3/2013

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1000 2000

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Hourly GPM demand in July 2014

m 

8,000 - 10,000 6,000 - 8,000

ght to 11 pm

4,000 - 6,000 2,000 - 4,000

• 2,000

 Midnig

Low demands

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Low demands from midnight to 5 am

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7/1/20 7/2/20 7/3/20 7/4/20 7/5/20 7/6/20 7/7/20 7/8/20 7/9/20 7/10/20 7/11/20 7/12/20 7/13/20 7/14/20 7/15/20 7/16/20 7/17/20 7/18/20 7/19/20 7/20/20 7/21/20 7/22/20 7/23/20 7/24/20 7/25/20 7/26/20 7/27/20 7/28/20 7/29/20 7/30/20 7/31/20

New Storage Tanks will eliminate much

• f unused flows
• f unused flows
• New tanks were sized to

Typical Dry Weather Wastewater Fl V i ti

efficiently utilize nighttime flows to fill storage T k ill b ti d

8.0 9.0

Flow Variation

• Tanks will be emptied

during peak demands and refilled nightly

5.0 6.0 7.0 , mgd Typical Summer

• Analysis of available flows

shows that there is insufficient flows to fill

1 0 2.0 3.0 4.0 Flow, Typical Summer Hourly Flow Pattern Typical Average Daily Summer Flow

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insufficient flows to fill tanks and expand nighttime deliveries

0.0 1.0 Time of Da

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Time of Day

S d D li i Sunday Deliveries

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Sunday deliveries are significantly below

• ther days of the week
• ther days of the week

35 25 30 and 15 20 aily AF Dema 5 10 Da

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• 1/2/2013

1/13/2013 1/23/2013 2/3/2013 2/13/2013 2/24/2013 3/6/2013 3/17/2013 3/27/2013 4/7/2013 4/17/2013 4/28/2013 5/8/2013 5/19/2013 5/29/2013 6/9/2013 6/19/2013 6/30/2013 7/10/2013 7/21/2013 7/31/2013 8/11/2013 8/21/2013 9/1/2013 9/11/2013 9/22/2013 10/2/2013 0/13/2013 0/23/2013 11/3/2013 1/13/2013 1/24/2013 12/4/2013 2/15/2013 2/25/2013

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2 2 3 3 4 4 5 5 6 6 7 7 7 8 9 1 1 1 1 1 1 Wednesday Sunday

Potentially 500 AF of deliveries could be provided provided

Annual Acre-Feet Delivered (by day of week)

820 756 768 817 832 Sunday Monday Tuesday Wednesday Thursday Friday Saturday 692

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Total

What changes can be implemented to capture similar usage? capture similar usage?

• Sunday Rotation

Annual Acre-Feet Delivered

y

– As Saturdays and Mondays are peak days, smooth demands over 3

(by day of week)

Sunday Monday Tuesday Wednesday Thursday Friday Saturday

smooth demands over 3 days

• Sunday Rate

820 756 768 692 817 832 Saturday

– Discounted rate to incentivize voluntary Sunday usage

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– First come first serve

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Total

Sh ld M th Shoulder Months

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Shoulder Month pricing, could increase deliveries

1,400

deliveries

1,000 1,200 600 800 Acre-Feet 200 400

Plant operates at peak capacity during summer months

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• If DWS is under the

blue line, plant has available capacity

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Sum of Sum of DWS (AF) Sum of iDWZ Pumping (AF)

All demands below the dotted line could be met with DWS be met with DWS

2,000 1,400 1,600 1,800 and 800 1,000 1,200 e-Feet Dema 200 400 600 Acre

• Est. Plant Capacity

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Sum of Sum of DWS (AF) Sum of Total DWZ Demand