8/9/2023 0 Comments Stem inc. energy storage logo![]() The companies, which gained an endorsement from Japan’s Ministry of Energy, Trade and Infrastructure, will install a “virtual power plant” made up initially of aggregated storage systems that will supply 750 kilowatt-hours of capacity to the grid. Two California energy storage providers say they are deploying networks of systems in Japan to help the country use more renewable energy. For Tepco, it could involve a specific contract with a specific tariff for a customer with multiple sites, that says, ‘Hey, if I want to ask you to reduce something, you can figure out which sites to reduce from, and as long as I get that capacity, I’m happy.’” “It’s basically treating an organization as a single organization, no matter how many sites it has. In that way, “We can balance the load and reduce bills, even if one site is overcharging,” both from an electrical and a financial perspective, he said. ![]() Many of its deployments in Tokyo are owned by the same company, he noted, and that company wants to “maintain them as a logical node - a nanogrid if you will - so if the total aggregate is supposed to have a load of x, and a certain site cannot meet its goals, we can use available capacity from a sister site and level them off.” The third use case is where the virtual power plant controls come in, Milani said. That’s the core value proposition for most of the systems deployed by Stem, Green Charge Networks and other behind-the-meter battery players in the C&I space. The second is to reduce demand charges, or extra costs imposed on buildings that exceed certain limits on how much power they can draw from the grid at any one point in time. (Milani will speak today on a panel at Greentech Media’s Energy Storage Summit 2017 conference in San Francisco.) The first is fairly straightforward - dispatching or importing power from the batteries to prove they’re tightly controlled enough to maintain a target wattage reading at each site. Sunverge CEO Milani said the company is being asked to test three use cases. But he did say that several of the company’s “dozens” of 19.6 kilowatt-hour battery-inverter units have been deployed in C&I locations owned for about a year, based on work with Mitsui that started in early 2016. Sunverge CEO Martin Milani declined to give details on the scale of its work with Tepco in a Monday interview. Stem’s Tepco project will involve three commercial-industrial building sites with about 750 kilowatt-hours of battery capacity, one of which, a recycling center in the Tokyo suburb of Yoshikawa, started operations two weeks ago, Stem CEO John Carrington said in a Tuesday interview. The projects, announced Monday, are relatively small-scale, considering Tepco’s scale as Japan’s biggest utility. Sunverge and Stem, two California-based behind-the-meter battery startups, have landed their first international projects in Japan, joining mutual investor Mitsui in a series of virtual power plant projects for massive utility Tokyo Electric Power Co. “When aggregated, renewables can contribute a significant portion of a country’s energy generation without significant investment.” “The ability to aggregate and manage distributed energy resources as a fleet and combining and managing a logical subset and grouping as a virtual nanogrid is increasingly important in order to make the grid more stable, resilient and dynamic,” Sunverge CEO Martin Milani said in a statement. Japan’s government wants to reach 20% renewable energy by 2030 and is examining VPPs as one option to help achieve that goal. The Sunverge system will maintain a target wattage reading at individual meters, while also working to reduce demand charges. ![]() The platform is capable of adjusting within 15 minutes to major changes in demand. Sunverge will connect multiple separate storage units into a VPP managed with the company’s energy management platform. on behind-the-meter aggregation in the service territory of Tokyo Electric Power Co. Two California-based energy companies, Stem and Sunverge Energy, have inked energy storage deals in Japan, working with Mitsui & Co., Ltd. ![]()
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