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Project Focus: Mammoth Water District to collaborate with SPG Solar in building 1MW solar system

The Mammoth Community Water District (MCWD) approved a step that will see the District’s wastewater and recycled water treatment plant and the pumps that deliver reclaimed water to Sierra Star being powered by a renewable energy source in the form of a 1.05MW solar installation. SPG Solar agreed to the project, which the District claims will be Mono County’s largest installed solar PV system. Over 2,000,000kWh of electricity are expected to be produced at the site per year.

The project will be constructed next to the wastewater-recycled water treatment plant on the District’s property, which will continue to be used as an emergency detention pond for the treatment plant. SPG Solar confirmed with PV-Tech that the system will have an installed capacity of 1052.48kWp or 1.05MW and be constructed using a single-axis tracker. As the entire District’s electrical power is supplied by Southern California Edison, all excess energy produced will be fed into the SCE distribution grid.

Tom Cage, MCWD board member, said “This project is an example of doing what is right for the environment and doing what is good for MCWD customers.  Over the long run, this project will stabilize electrical pumping and waste management cost for the District and therefore assist in keeping rates low for our customers.  Saving customers’ money in the long run and helping the environment has long been a goal of the district.  Further, MCWD will be reducing electrical needs which will save 2,170 barrels of oil per year and eliminate 1,392 pounds of emissions into our air. We hope the implementation of this project will encourage everyone to use resources as efficiently as possible.”

Capital investment on the project totals around US$5.5 million, which is expected to be balanced with operating cost savings in nine years time. This figure also includes the US$3.3 million in California rebates, which will be paid to MCWD over the first five years of the system being in operation. Construction is scheduled to begin this month and be completed by this November.


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