Solar Energy and Battery Energy Storage For Cabrillo College - - PowerPoint PPT Presentation

Solar Energy and Battery Energy Storage For Cabrillo College

Gabriel Susca-Lopata

Climate Corps Energy Fellow, Cabrillo College FPPO Department

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Moti tivati tion f for P PV project

• Cabrillo College

Sustainability Plan (2016) goals: GHG reduction and renewable energy

• Project goal: ~2-

3MW onsite PV

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Proj

• ject

ect I Inves esti tigati tion

• n/Del

elivery M Model el

• Power-Purchase Agreement (PPA)
• Vendor owns the PV equipment, customer pays vendor for the PV energy
• Vendor responsible for O&M
• Small upfront payment, lifetime cost higher than project cash price

Considered Two Vendor Proposals From Similar Procurement Processes

Both proposed Carport Canopies PV

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Current V Vendor

• r Propos
• sals

Sunpower Forefront Power

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Forefron

• nt P

Pow

• wer

r Propos

• sals:

Forefront Solar-Only Forefront Solar & Storage

Aptos Campus Annual Offset 80% 80% Contract 20-yr PPA 20-yr PPA, 10-yr storage contract Energy Rates $0.11/kwh $0.11/kwh + ~$61k/yr storage fee Year-1 Energy-Bill Savings $45,023 $30,826

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How PPA $$ A $$$ S Savings w works

Example: Forefront Power Solar & Storage Proposal

Annual $ Savings

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How PPA $$ A $$$ S Savings w works

If renew/new agreement for storage after yr-10:

Annual $ Savings

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Paying F For Grid Interconnect ction [ [ex.

• x. Fo

Foref efront nt so solar & & storage sc scenario] ]

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• ex. $300k interconnection fees

Include in PPA: rate increases to $0.1174/kwh Lower net cash flow Upfront capital funding (PPA rate remains $0.11/kwh) Simple payback period ~5 years

Project Risks:

• Lower utility escalation
• Surprises in geotech assessment (soil

conditions)

• Changes in future MBCP rate structure
• Unknown interconnection cost (for

solar&storage scenario)

• GHG reduction eq. to ~282

passenger vehicles driven for

• ne year (Forefront proposal)*
• Visible indication of climate

action at Cabrillo

• Supports future building

electrification

Project Benefits:

*EPA Equivalencies Calculator

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Next S Step eps

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Deadline/Milestone Date/Deadline

Sign PG&E interconnection agreement (if solar-

• nly)

10/31/19 (deadline) Commit to solar PPA project -> vendor procures 5+% to secure 30% Investment Tax Credit ~October 2019 Construction Summer 2020 Begin operation Fall 2020

Questions?

Full Sunpower & Forefront presentation and pro-forma files are available on request

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Supplemental Slides

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Comparison o

• f Solar-Only v

vs Solar ar&Storag age Scenar arios

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Solar-Only S Sce cenario: T TOU-gran andfathering f for y year ars 1-7

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Fo Foref efront Power – Sys ystem D Design

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