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Solar Microgrid with Battery Storage for Critical Facility Resilience

Solution Overview

Berkeley's Energy Assurance Transformation (BEAT) Project establishes a solar-powered microgrid and community resilience hub at the City's Corporation Yard, providing long-duration, clean, and resilient energy supply for critical facilities during grid outages such as PG&E Public Safety Power Shutoffs.[2] The initiative originated from a $1.5 million California Energy Commission Electric Program Investment Charge grant to research whether creating a sustainable, resilient, clean energy microgrid that would maintain power during outages was feasible.[3] This approach combines solar generation, battery storage, and electric vehicle charging infrastructure to deliver backup power while advancing the city's Climate Action Plan goals, including the Fossil Free by 2030 target.[2]

Technical Components

The system integrates a 1.1 MW solar photovoltaic array installed on carports at the Corporation Yard and on the roof of the Public Safety Building.[2] A 2.2 MWh Battery Energy Storage System stores solar energy for use during grid outages and to reduce electricity costs.[2] The infrastructure includes 30 Level 2 EV charging stations and 6 DC fast chargers to charge the City's growing electric vehicle fleet.[2] A microgrid controller manages the generation, storage, and distribution of energy to ensure reliable power supply.[2] The project replaces natural gas equipment with all-electric heat pumps for heating and cooling at the Corporation Yard.[2] Research models demonstrated that clean energy microgrid community designs function by connecting multiple buildings and using clean energy like solar to share energy across facilities during normal operations, with the capability to operate independently from the grid during power outages using solar and battery storage.[3] Solar panel and energy storage systems were identified as a less restrictive approach to provide microgrid-level resiliency benefits to individual buildings.[3]

Implementation Details

The total project cost reached $11.7 million, funded through a California Energy Commission EPIC Grant of $8.7 million and a City of Berkeley contribution of $3 million.[2] Project partners include the City of Berkeley, TerraVerde Energy, Center for Sustainable Energy, Kisensum Inc., University of California Berkeley, and Lawrence Berkeley National Laboratory.[2] The original BEAT research project was managed by the Office of Energy and Sustainable Development with subrecipients including Lawrence Berkeley National Laboratory, URS Corporation, Association of Bay Area Governments, Center for Sustainable Energy, Interface Engineering, West Coast Code Consultants, and NHA Advisors.[1] Based on the BEAT project's recommendations, the City of Berkeley funded several solar plus storage projects at municipal buildings throughout the city.[3] Implementation faced significant regulatory constraints, as the City found that development of clean energy microgrid communities was severely restricted by California Public Utility Commission code and utility policies.[3] The Pacific Gas & Electric Company had no interest in adding automatic shut-off switches to cut power to non-microgrid customers and had no legal shutoff agreements in place with non-microgrid customers.[3] The option of adding new distribution lines proved prohibitively expensive, with construction per mile estimated at $1 million, including capital costs, installation costs, utility charges for operation and maintenance of distribution lines, and the transfer tax of deeding assets to the utility.[3]

Benefits and Impacts

The design allows the city to reduce utility energy consumption by 36-43 percent and reduce existing reliance on backup diesel generators during power outages by up to 40 percent.[1] Research models confirmed that clean energy microgrid community and solar plus storage designs reduced day-to-day energy consumption 36 to 43 percent and reduced diesel generator use during an outage by up to 40 percent.[3] The system provides a resilient, long-duration power supply exceeding 72 hours for the City's most critical facilities during grid outages, including the Emergency Operations Center, 911 Dispatch Center, and Public Safety Building.[2] The project reduces the City's electricity costs and demand charges, saving an estimated $100,000 per year.[2] The Corporation Yard serves as a resilience hub during grid outages by providing a place for community members to access information, charge personal electronic devices, and receive emergency supplies.[2] The initiative generates clean, renewable energy to power City facilities and charge the City's growing electric vehicle fleet, helping meet Climate Action Plan goals.[2] The system is made up of solar panels and energy storage that provides Berkeley's critical facilities with clean, reliable backup power in the event of a disaster and isolates the facility from the grid.[3]

Climate Adaptation Relevance

This implementation directly addresses grid disruption risks from climate-related events, particularly PG&E Public Safety Power Shutoffs that occur during extreme weather conditions.[2] Berkeley's Climate Action Plan includes developing and implementing a strategy to maximize local solar and energy storage deployment, with a focus on municipal facilities, schools, and low-income housing.[4] The plan also includes exploring the feasibility of developing one or more community microgrids to enhance energy resilience, particularly in critical facilities and vulnerable communities.[4]

Business Analysis

The financial model demonstrates strong public sector investment with the California Energy Commission providing 74 percent of project costs through EPIC grant funding, while the City of Berkeley contributed the remaining 26 percent.[2] The $100,000 annual savings in electricity costs and demand charges provides ongoing operational benefits that improve the project's long-term financial viability.[2] Policy support extends beyond project-specific funding, as Berkeley's Climate Action Plan establishes a goal to partner with East Bay Community Energy to achieve a 100 percent renewable electricity supply for all customers in Berkeley by 2030.[4] The broader market context for bidirectional electric vehicle integration shows emerging revenue opportunities, with Pacific Gas and Electric operating the nation's first pilot program that allows up to 1,000 residential customers with bidirectional chargers to sell power back to the utility.[5] International implementations demonstrate significant financial benefits, as bidirectional charging in Denmark earns electric vehicle fleet owners who sell power to the grid $3,000 per vehicle annually, reducing the average total cost of electric car ownership by approximately 40 percent.[5] California expects to have 12.5 million electric cars on the road by 2035, creating substantial potential for vehicle-to-grid applications.[5]

[1]: Office of Energy and Sustainable Development, City of Berkeley [2]: Berkeley's Energy Assurance Transformation (BEAT) Project documentation [3]: Berkeley Energy Assurance Transformation project research findings [4]: Berkeley's Climate Action Plan [5]: Pacific Gas and Electric bidirectional charging program documentation [6]: Bidirectional electric vehicle technical specifications [7]: EV battery backup energy storage capabilities

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