When a heatwave struck California last August, a private energy service company coordinated the solar arrays, battery storage, and smart appliances and thermostats of 150,000 homes – and helped mitigate rolling blackouts caused by the extreme heat.
The company, called OhmConnect, is one of many that coordinate decentralized power sources for efficient delivery. These so-called virtual power plants, or VPPs, could be a way to promote energy equity by ensuring cheap and reliable power for low-income communities. They can also serve as a valuable weapon in fighting the climate crisis.
VPPs are online, cloud-based control centers that connect homes and businesses already linked to the grid with thousands of disparate power sources, such as solar power and batteries.
The approach is one that increases grid resiliency and guards against blackouts. The plant takes information from the various sources, then calculates the smart distribution of energy when demand spikes, such as during intense heat, or when it’s needed to help maintain system reliability.
And their sizeable dependence on solar power makes them especially important in California and elsewhere as a way to promote solar and discourage the use of fossil fuels.
Autogrid CEO Amit Narayan told Forbes he considers VPPs to be “one of the top five innovations of the last decade.”
They’ve already shown their merit in the U.S.
During peak stress on the grid last summer, OhmConnect saved almost one 1 gigawatt hour of total energy usage, the equivalent to taking roughly 600,000 homes off the grid for an hour.
“OhmConnect toggled its customers’ smart devices and appliances off and on 739,000 times to save energy and reduce stress on the grid, paying out $1 million to users, and helping avoid additional blackouts,” according to a company statement.
By aggregating homeowners’ solar power and battery storage to support the failing electric system, the company operated these multiple, decentralized, dispersed energy resources virtually as a single large power plant.
VPPs could benefit customers, with or without solar and batteries, and utility companies:
- Customers are paid for the use of their equipment to support the grid, and solar and battery installations can be free if not owned by the customer.
- VPPs could address equity. OhmConnect CEO Cisco Devries told Microgrid Knowledge that 40 percent of its VPP customers are low-income and paid roughly $200 annually to participate in the program.
In a separate project with Southern California Edison, or SCE, 10 percent or more of solar power installer Sunrun’s customers will be low to moderate income, according to PV Tech.
- VPPs can enhance electric system resiliency. Xin Jin, senior research engineer at the National Renewable Energy Lab, told Forbes, “We saw that in California fires this year, PG&E cut power for hours or days, and if you had PV [photovoltaic] and battery storage in your home, you could keep power going to survive that interruption.”
- Utilities benefit from enhanced system reliability and resiliency, because they allow expensive local distribution system upgrades to be deferred, Swell Energy CEO Suleman Khan told Energy Storage News. VPPs can support regional transmission networks, a service utilities must provide. Khan says utilities have been initiating discussions with the company to discuss VPPs.
- VPPs help states meet carbon dioxide emissions reduction goals, because of their heavy reliance on solar power generated from installations on residential properties. The VPP “battery swarm can begin to replace the traditional centralized fossil fuel-based power plant....,” Blake Richetta, CEO of Sonnen US, told Forbes.
VPPs could bolster the value for the electric system of solar-plus-batteries on homeowner and commercial property. This would influence the rooftop solar debate in California – and how California, the leading solar energy state, treats solar customers will reverberate across the country.
In hearings over the fate of California’s rooftop solar program, the big three utilities – Pacific Gas & Electric, Southern California Edison, and San Diego Gas & Electric – claimed customers with solar and batteries are shifting costs to low-income customers who don’t have access to clean energy sources.
These claims feed the false notion that correcting inequities requires punishing solar customers with high fixed charges. But the sweeping benefits of VPPs in reliability, cost and climate make such arguments moot.
No longer can utilities use the low-income customer as a wedge issue to argue that rich people with solar are exploiting low-income families. And the California Solar + Storage Association notes that these households’ access to solar in California is growing, further undermining that claim.
EWG submitted testimony to the California Public Utilities Commission that opposes potential detrimental changes to customer-owned solar policy that the state’s large utilities are advocating.
EWG calls for leaving intact the current program, which benefits customers, and growing the rooftop solar market, as mandated by state law. We also call for assessing whether utilities’ assertions of cost-shifting are true.
The commission should ignore the utility anti-solar policy that worsens the climate crisis and weigh the benefits of the VPP approach for all customers.