German home energy storage and virtual power plant (VPP) company sonnen and solar contractor ES Solar are expanding a Utah and Idaho VPP programme to include up to 35MWh of residential batteries by the end of the year.
The Wattsmart programme from utility Rocky Mountain Power (RMP) was approved by the Idaho Public Utilities Commission in April this year. The programme gives home battery owners the option to give RMP some control of the battery system to support the grid, in exchange for an upfront incentive and ongoing bill credits.
RMP has direct control over the batteries enrolled and can dispatch it on demand to meet grid conditions with daily solar time shifting and load curtailment, as well as frequency response services and directed solar grid injection when the grid needs power the most.
ES Solar expects to bring up to 35MWh of grid-interactive battery capacity online in 2022 via the Wattsmart programme. The company said that sonnen energy storage sales are reaching over 6MWh a month, thanks to the programme.
Blake Richetta, Chairman and CEO at sonnen, commented: “As Rocky Mountain Power’s battery programme grows, ES Solar is succeeding in overcoming the complex concepts and challenges associated with effectively integrating residential solar-plus-storage into the broader energy system. As this radical model expands into thousands of new homes, so does the use of batteries for the betterment of individuals, society and the environment, which is the ultimate purpose of a solar battery.”