California’s Largest Utility Seeks 20 Microgrids to Ward off Wildfire-related Power Outages

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Racing to beat California’s next wildfire season, Pacific Gas & Electric (PG&E) is seeking companies to install microgrids near 20 substations.


By Sundry Photography/

The microgrids will be used to keep electricity flowing when the utility shuts down power lines that could spark wildfires during windy and dry weather.

California’s largest utility issued a solicitation for the microgrids last week and intends to move fast. It wants to have the microgrids installed by June 1, 2020 or at the latest Sept. 1, 2020. California’s wildfire threats are usually greatest in autumn.

The utility seeks companies willing to either build, own and operate the microgrids or build them on behalf of the utility, which would then own them.

Notice of intent due December 17

Bidders are asked to file a notice of intent by this Tuesday — December 17, 2020. Full proposals are due Jan. 15, 2020. 

The 20 microgrids are part of a larger state regulatory requirement that PG&E secure 716.9 MW of resource adequacy capacity. 

In a presentation before the California Public Utilities Commission last week, PG&E said that the microgrids are expected to keep power flowing to thousands if not tens of thousands of customers per substation during a power shutoff.

The utility hopes to cut the number of customers that lose power by nearly one-third, compared to its October 29 ‘public service power shutoff’ (PSPS), the term California uses to describe de-energizing power lines so that they won’t spark wildfires. From October 26-November 1, PG&E cut power to about 941,000 customers, the highest count for the wildfire season.

In addition to installing the 20 microgrids, PG&E says it plans to support state regulatory goals to make it easier for customers to do the same on their own.

Opportunity now exists for California utility customers to offset costs of energy storage  — often part of a microgrid or nanogrid — through the state self-generation incentive program (SGIP), a $166 million/year ratepayer funded rebate program. The PUC made funds available within low-income communities and for medically vulnerable customers in areas threatened by wildfires.

The SGIP incentive of $1/Wh covers 98% of the $13,500 cost of a 13.2 kWh, two-hour residential storage system, according to the CPUC.

PG&E requirements for microgrids

In a webinar about its solicitation for the 20 microgrids, PG&E said the projects must be able to provide power to customers for at least 4-5 consecutive days.

When the microgrids are not providing backup power, they must serve the power grid and help bolster its resilience. The microgrids also must have blackstart capability, meaning they can start up without relying on a charge from the grid.

PG&E is open to two types of microgrid ownership models: 1.) third-party owned or 2.) engineering, procurement, construction (EPC). 

A third-party project would be built outside of the substation on land designated by PG&E. The  microgrid owner would sell PG&E microgrid services and market products, such as energy and ancillary service or green attributes. PG&E would sign a 10-year contract with the microgrid owner.

An EPC microgrid would be built by a third party but owned by the utility and could be located within the substation footprint.

If a project requires the use of natural gas, PG&E will arrange for delivery of renewable natural gas.

Choosing projects

In evaluating the offers, PG&E  plans to use both quantitative and qualitative criteria. Quantitative evaluation will be based on a least-cost ranking. Qualitative criteria may include such factors as project viability, safety and bidder development experience financial strength and supply chain responsibility.

PG&E also is interested in proposals that offer to develop projects at multiple sites. 

The utility expects to execute contracts Feb. 14, 2020 and submit them for regulatory approval Feb. 20, 2020. The full microgrid solicitation is available on PG&E’s website.

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About Elisa Wood

Elisa Wood is the chief editor of She has been writing about energy for more than three decades for top industry publications. Her work also has been picked up by CNN, the New York Times, Reuters, the Wall Street Journal Online and the Washington Post.


  1. […] apologize for issues you may have had trying to open the lead article in today’s newsletter: California’s Largest Utility Seeks 20 Microgrids to Ward off Wildfire-related Power Outages. Several readers have contacted us saying they could not access the article this morning. So we are […]

  2. […] deal follows release of a solicitation last week by Pacific Gas & Electric for 20 microgrids, as well as the announcement in recent weeks of an array of other microgrids […]

  3. […] article was originally published on Microgrid Knowledge. Republished here with […]

  4. […] the microgrids installed by June 1, 2020 or at the latest September 1, 2020,” Microgrid Knowledge reported last month. The systems, part of a larger, 716.9-megawatt procurement required by state regulators, […]

  5. […] the state’s largest utility with 16 million customers, was the first out of the gate with a large solicitation for microgrids in mid December. The utility is seeking 20 microgrids totalling 522 MW. The […]

  6. […] of natural gas, PG&E says it will arrange for delivery of renewable natural gas. The utility is soliciting bids for the permanent microgrids so their costs are not yet known. Their capacity will range from 4 MW […]

  7. […] when it must shut down power lines to prevent wildfires. PG&E is currently reviewing bids from a solicitation for the microgrids and is expected to announce winners in the second […]

  8. […] cost proposed for each microgrid, which the utility secured via competitive bids, is […]