The advent of large-scale solar on the grid has created a different kind of challenge – over-generation at midday, followed by the need to ramp up non-solar generation quickly each evening as the sun sets and household loads increase.
To help address this regional problem, the Redwood Coast Energy Authority is building battery energy storage projects.
Tierra Buena battery energy storage system
The Tierra Buena project will help RCEA deliver cost-effective, low carbon electricity to our customers while helping the state maintain grid reliability during the transition to renewables.
RCEA and Valley Clean Energy signed 10-year agreements with Ormat Technologies for 2.5 MW each of the 5 MW/20 MWh Tierra Buena Battery Energy Storage System.
Commercial operation of the Tierra Buena project started June 2022 and provides resource adequacy for both RCEA and Valley Clean Energy. It also helped both Community Choice Aggregators meet a critical compliance deadline. The facility in Sutter County, CA will also offer ancillary services and energy optimization facilities through participation in merchant markets run by the California Independent System Operator.
Long Duration Storage projects
with California Community Power Members
RCEA teamed up with six other Community Choice Aggregators early in 2022 on two new energy storage projects that not only help fulfill compliance requirements, but more importantly support the transition to a carbon-free energy future.
The first one, the REV Renewables Tumbleweed project, will be a CAISO grid-connected, lithium-ion battery storage resource located near Rosamond, in Kern County, California, with an expected online date of 2026. RCEA’s share of the 69-megawatt project will be 2.5 MW, or 3.6% of the total of the project’s capacity, which satisfies about one-third of RCEA’s total “long lead time” compliance requirements.
The second is ‘Goal Line’, a 50MW/400MWh lithium-ion energy storage project with eight hours of discharge duration. It’ll be developed by Onward Energy in Escondido, California, with an expected online date of 2025.
Redwood Coast Airport Microgrid
For our recently completed local project in McKinleyville, we paired our new 2.3 megawatt solar photovoltaic array with a 2 MW battery storage system that can provide 9 MWh of energy. The battery storage system, comprised of three Tesla Megapacks, provides the ability to “island” from the main grid so the airport and adjacent Coast Guard facility can run fully on solar and batteries if there is a regional power outage.
Read more about this project on our Redwood Coast Airport Microgrid page.