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The Vallecitos Water District Twin Oaks Reservoir dual solar panel array is expected to be completed in November 2020. Photo: Vallecitos Water District Solar Project

Solar Project Saves Energy, Costs for Vallecitos Water District

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The Vallecitos Water District is pursuing greater use of renewable resources, increasing capacity to the electrical grid, and reducing long term operational costs with an innovative solar power project.

The west solar array is installed on top of the Vallecitos Water District’s 33-million gallon reservoir with 2,300 solar modules and eight 80 kw inverters. The east array is located on top of the 40-million gallon reservoir with 2,900 modules with ten 80 kw inverters. Photo: Vallecitos Water District

In 2017, the Vallecitos Water District Board of Directors agreed to pursue development of districtwide renewable power sources using existing open space to benefit the District and its ratepayers.  The District worked with solar consultants Terra Verde Renewable Partners to evaluate and study the feasibility of three solar port locations. Two projects are now moving forward; two arrays at the pair of Vallecitos owned reservoirs in Twin Oaks, and an array at the (sewer) Lift Station #1, located on San Marcos Boulevard.

The projects are structured under a Power Purchase Agreement. A solar provider designs, builds, and maintains systems for 25 years. In turn, the District receives a reduced electricity rate from SDG&E over the 25-year term at the District’s 13 highest use meters. The District will become owners of the solar system after the 25-year maintenance term expires. No capital investment is required from the District.

“The project is a great benefit to Vallecitos customers,” said Ryan Morgan, Capital Facilities Senior Engineer. “Through our export of power into the electrical grid, we receive bill credits on these power exchanges. The District benefits directly through reduced power costs, and that cost savings is passed down to the customer ultimately in reduced water and sewer rates.”

Multiple stakeholders working together

Vallecitos Water District provides the project sites, working with SDG&E, the solar provider team, the District’s contractors, and the solar maintenance operator. The District’s water professionals work with solar power experts to guide the project through planning, design, and construction as a team.

Over the 25-year term, the District will benefit from a reduced electrical rate of 7.79 cents per kilowatt-hour (kWh) at its 13 highest use meters. It will also receive a rebate or credit on its export of power to the electrical grid. Savings to the District over 25 years are estimated at $8.3 million, which ultimately results in reduced water and sewer rates for customers. District staff locked in the maximum federal rebate by launching the project in 2019 and meeting a narrow window for grant funding.

Solar panels installed on top of two reservoirs

The Twin Oaks Reservoir dual solar panel array sites prior to installation. Photo: Vallecitos Water District solar project

The Twin Oaks Reservoir dual solar panel array sites prior to installation. Photo: Vallecitos Water District

The west solar array is installed on top of the District’s 33-million gallon reservoir with 2,300 solar modules and eight 80 kW inverters. The east array is located on top of the 40-million gallon reservoir with 2,900 modules with ten 80 kW inverters. The total production is roughly 3.6 MWh annually, enough to power 340 homes.

Local power conservation remains vital

The Twin Oaks Reservoir dual solar array total production is roughly 3.6 mWh annually, enough to power 340 homes. Photo: Vallecitos Water District

The Twin Oaks Reservoir dual solar array total production is roughly 3.6 mWh annually, enough to power 340 homes. Photo: Vallecitos Water District

While the solar power project cannot prevent the potential for power outages due to rolling blackouts, the project helps to add capacity to the power grid when it is needed.

“The District wants to publicly thank Terre Verde Renewable Partners, Holt Renewables, and Kenyon Energy for their valuable roles in the success of this project,” said Morgan.  “We also want to acknowledge the above and beyond effort of the District’s inspections team.”

The Twin Oaks Reservoir dual array is expected to be completed in November 2020. The Lift Station #1 site is expected to be completed in February of 2021.

Three Key Takeaways from FERC Chairman Neil Chatterjee’s Keynote at REFF

/in , , /by /pv magazineby Eric Wesoff

The Federal Energy Regulatory Commission has had a busy year. Chairman Neil Chatterjee gave a keynote at last week’s virtual REFF Wall Street to sum up 2020’s regulatory challenges and victories.

Chatterjee believes in competitive markets and is happy to see renewable sources win on price on an equal playing field. He didn’t mention solar by name — but he is really enthusiastic about storage, hybrid generation, and the changing regulatory landscape around these new resources.

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Nation’s Largest Solar Farm Approved for Tulare County

/in , , , /by /The Sun Gazette

Work to build the nation’s largest solar farm in Tulare County may begin by the end of this year. At its Aug. 26 meeting, the Tulare County Planning Commission unanimously approved environmental documents for the Rexford Solar Farm in southeastern Tulare County.

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UC Becomes Nation’s Largest University to Divest Fully from Fossil Fuels

/in , , /by /Los Angeles Times by Teresa Watanabe

The University of California announced Tuesday that it has fully divested from all fossil fuels, the nation’s largest educational institution to do so as campaigns to fight climate change through investment strategies proliferate at campuses across the country.

The UC milestone capped a five-year effort to move the public research university system’s $126-billion portfolio into more environmentally sustainable investments, such as wind and solar energy. UC officials say their strategy is grounded in concerns about the planet’s future and in what makes financial sense.

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Greenhouse Gas Emissions in San Diego Down 24% Over Past Decade

/in , /by /Times of San Diegoby Chris Jennewein

San Diego has cut greenhouse gas emissions by residents, businesses and government by 24 percent over the past decade — far surpassing the official 2020 goal of 15 percent.

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Valley Center MWD Cool Valley Reservoir

Valley Center Reservoir Project ‘Exceptional’

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The Valley Center Municipal Water District has been advised by the California State Water Resources Control Board that its Cool Valley Reservoir Cover Replacement Project was recognized by the Environmental Protection Agency’s new AQUARIUS Program as an “Exceptional Project,” among only 10 identified as such nationwide.

Each year, EPA’s Aquarius Program recognizes one Drinking Water State Revolving Fund project from each of its 10 regions nationwide for “exceptional focus on sustainability, protection of public health” while demonstrating a high level of innovation.

The $4.2 million Cool Valley Reservoir Cover Project was nominated by the SWRCB, EPA’s state-level partner in the DWSRF Program in California.

Cool Valley Reservoir Project ‘Innovative’

Constructed in 1975 and with the original floating flexible reinforced “Hypalon” material installed in 1992, Cool Valley is Valley Center’s largest drinking water reservoir with a capacity of 57 million gallons, providing about 40% of the District’s total covered drinking water storage capacity. By 2015, the floating cover had reached its full life expectancy and started to experience failures, possibly placing the quality of the water in the reservoir at risk. 

At that point the decision was made to take the reservoir out of service and seek DWSRF financing to cover the estimated $4.2 million project cost, rather than make additional repairs to the existing liner. 

With interim adjustments to system operations and cooperation from Valley Center’s wholesale supplier, the San Diego County Water Authority, the system operated reliably with Cool Valley off-line.

‘Exceptional Project’ reduces bacteria and energy use

District engineering staff and consultants were successful in securing the 20-year loan at 1.6% interest. With the loan secured, the project was approved by the Valley Center Board in the FY 2015/2016 Budget.  The project took 12 months to complete and was back on line by mid-2017. The effort was overseen by Wally Grabbe, District Engineer and managed by Dennis Williams (retired), Deputy District Engineer. 

Projects nominated by the states must meet three major criteria, including providing Safe Drinking Water Compliance, Public Health Benefit and having Financial Integrity.  Additionally, each project must demonstrate leadership in dealing with emerging contaminants, aging infrastructure or innovative financing, affordability, water loss control, efficient water and/or energy use, creative approach to project planning and implementation, and/or creating water system partnerships.

In making the award, the SWRCB and EPA noted that the Valley Center Cool Valley Project will not only protect water quality from atmospheric vectors, but the new cover-liner will “prevent leakage from the reservoir, reduce bacteria by creating a barrier between the drinking water and the concrete liner… and reduce chemical and energy use.

During the same period of time, the Valley District designed and installed a 95kW Photovoltaic Solar Array and upgraded the Cool Valley Pump Station, all located on the Cool Valley Reservoir site.

Farmland Owners Look to Solar As Groundwater Restrictions Loom

/in , /by /Bakersfieldby John Cox

New solar energy installations may be headed to the valley portion of Kern County as investors, government officials and advocacy groups weigh options for reusing land that will have to be taken out of production as a result of state restrictions on groundwater pumping.

Photovoltaic solar arrays, for years an attractive investment for local farmland owners, would appear to align with California’s ambitious goal of meeting all its electricity needs with renewable energy.

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‘Farming the Sun:’ As Water Goes Scarce, Can Solar Farms Prop Up The Valley?

/in , /by /Sacramento Beeby Dale Kasler

On the Changala family farm in Tulare County, the past and future are separated by a dirt road and a barbed-wire fence.

On the south side sits a wheat field. On the north, a solar farm, built three years ago, sending electricity to thousands of Southern Californians. Alan Changala sees little difference between the two.

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California Starts Among Largest Community Solar Projects In U.S.

/in , , /by /Bloomberg Environmentby Emily C. Dooley

The Imperial Irrigation District and the non-profit Citizens Energy Corp. powered up a 30-megawatt community solar project near California’s Salton Sea that will provide thousands of low-income customers in the region with discounted renewable energy.

The $46 million project is one of the largest community solar installations in the country and uses 107,000 photovoltaic panels on 200 acres, Imperial Board President Erik Ortega said Sept. 25.

With the flipping of the switch low-income customers will be able to say they are part of California’s clean energy revolution, Ortega said.

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The winning water sample was taken directly from the Richard A. Reynolds Desalination Facility, the same water provided to its customers. Photo: Sweetwater Authority Bset Tasting Water Award

Sweetwater Authority Wins ‘Best Tasting Membrane Water’ Award

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The Sweetwater Authority Governing Board was presented with the Southwest Membrane Operators Association (SWMOA) ‘Best Tasting Membrane Water in the Southwest Region Award’ at its July 24 board meeting.

The award recognizes the Authority’s Richard A. Reynolds Desalination Facility as the winner of the Best Tasting Membrane Water Competition held during the SWMOA Annual Symposium in June.

The winning water sample was taken directly from the Richard A. Reynolds Desalination Facility, the same water provided to its customers. Judges based their assessment on the following criteria: taste, odor, color, clarity, mouthfeel, and aftertaste.

Among the participants in the competition representing water agencies from the Southwest United States, the Authority received the highest cumulative score.

Facility provides Authority customers with one-third of their annual water supply

The Richard A. Reynolds Desalination Facility is a state-of-the-art groundwater desalination facility Photo: Sweetwater Authority Best Tasting Membrane Water Award

The Richard A. Reynolds Desalination Facility is a state-of-the-art groundwater desalination facility Photo: Sweetwater Authority

The Richard A. Reynolds Desalination Facility in Chula Vista is a state-of-the-art groundwater desalination facility designed to use reverse-osmosis membrane treatment to remove dissolved salts and microscopic particles, such as bacteria and other contaminants which can be found in groundwater. The facility can produce up to 10 million gallons of drinking water per day, enough for approximately 18,000 families, and provides Authority customers with about one-third of their annual water supply.

The facility began operating in 1999 drawing brackish groundwater from five wells. That same year, the facility was honored with a San Diego Orchid award in the competition’s environmental solutions category. Its phase two expansion was completed in 2017.

The facility’s sustainable design also includes 2,950 ground-mounted solar PV panels as an alternative energy source. The solar array offsets the cost of treating water and reduces the facility’s overall carbon footprint.

The facility was previously honored with the American Society of Civil Engineers’ Project of the Year award, as well as the South County Economic Development Council’s Corky McMillin/Best of South County Award.

Among the participants in the competition representing water agencies from the Southwest region of the country, the Authority received the highest cumulative score. Photo: Sweetwater Authority Best Tasting Membrane Water Award

Among the participants in the competition representing water agencies from the Southwest region of the country,  Sweetwater Authority received the highest cumulative score. Photo: Sweetwater Authority

The Southwest Membrane Operator Association is an affiliate of the American Membrane Technology Association and dedicated to the Southwest United States region including, but not limited to Arizona, California, Colorado, Hawaii, New Mexico, Nevada, and Utah.

READ MORE: San Diego’s Farmer of the Year Taps Every Drop