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Tesla, PG&E break ground on Moss Landing Battery Energy Storage system

moss landing energy storage Construction start

MOSS LANDING, Calif (KION) PG&E and Tesla have started construction on a lithium-ion battery storage system at PG&E's electric substation in Moss Landing, according to the utility.

PG&E expects construction to continue into early 2021, and it plans to have the system energized in early 2021 and fully operational soon after.

Crews will install 256 Tesla Megapack battery units on 33 concrete labs, and each unit includes batteries and power conversion equipment. It is expected to be able to store and dispatch up to 730 megawatt hours of energy to the electrical grid at a maximum rate of 182.5 MW for up to four hours during periods of high demand, according to PG&E.

When it is operational, PG&E said the system will be one of the largest utility-owned, lithium-ion battery energy storage systems in the world.

“Battery energy storage plays an integral role in enhancing overall electric grid efficiency and reliability, integrating renewable resources while reducing reliance on fossil fuel generation. It can serve as an alternative to more expensive, traditional wires solutions, resulting in lower overall costs for our customers,” said Fong Wan, senior vice president of Energy Policy and Procurement for PG&E. “The scale, purpose and flexibility of the Moss Landing Megapack system make it a landmark in the development and deployment of utility-scale batteries.”

PG&E expects that the system will save more than $100 million in 20 years.

The Monterey County Planning Commission approved the project in February. The project did not qualify for an exemption under the California Environmental Quality Act because an Initial Study/Mitigated Negative Declaration found potential impacts to air quality, cultural resources, geology/soils, greenhouse gas emissions, hazard/hazardous materials, hydrology and water quality, land use/planning, transportation/traffic and tribal cultural resources.

The planning commission said the potential impacts were found to bee less than significant or less than significant with mitigation measures, so it said mitigations have been incorporated to reduce potential impacts to a level of insignificance.

Monterey County / Top Stories

Avery Johnson

Avery Johnson is the Digital Content Director at KION News Channel 5/46.



  1. If you could charge those batteries with power derived through other than fossil fuel or nuclear means, that would be great, but if I understand the article correctly, it is charged by the grid and is nothing more than a peak power augment to the normal grid? Kind of like carrying around an extra 5 gallons of gas in your car. Hmmmm not sure if that logic works. Oh well.

  2. @Frankie
    If Elon Musk is doing it, it is being done because there is something in it for Elon Musk.
    You are right.
    And we are paying for it.
    Oh, that is it….right, Elon (Mr. Battery) is selling the batteries. LOL.

    1. I am working on my own solar project at the moment and Mr. Musk is not supplying any of the parts or batteries. The only true downside to solar power is the battery consumption through an inverter is crazy. 4 amps out of an inverter requires 40 amps from the battery. 4 amp times 120 V is 480 watts. 40 Amps times 12 volts is 480 watts (kind of makes you wonder…120 VAC….12 VDC…makes the math easier). But I think I got all the wire AWG’s all figured out so now I get to play. But I am discovering that you don’t get a lot of sun hours on the central coast, but that is part of the testing. How long will it take a 100 watt solar panel to bring a battery from 25 to 100 percent and how long can one battery operate an inverter at half capacity.

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