Stem installs 1-MW of energy storage at 29 customer sites to create VPP for Hawaiian Electric Company

Written By: Stratton Report
January 30, 2017



On January 30, Stem, Inc., announced it had completed testing on its customer-sited storage fleet installed for Hawaiian Electric Company.

According to the energy storage provider, the storage fleet provides 1-MW across 29 customer sites to accommodate more renewable energy resources on the O‘ahu grid.

Stem noted that Energy Excelerator, a Hawai‘i-based startup project of the Pacific International Center for High Technology Research, had provided support funding and a platform to partner with the utility.

Stem stressed that its software-driven storage acts as a VPP to manage diverse load shapes and site characteristics to serve the utility’s real-time needs. The firm emphasized that its predictive, cloud-based analytics incorporates weather forecasts and historical and real-time usage data to predict when electric use will peak at a given site, combining this information with data from Hawaiian Electric’s renewable generation monitoring and forecasting so the utility can call upon the stored electricity for added stability.

Dora Nakafuji, Hawaiian Electric’s director of renewable energy planning remarked:

“These customer-sited solutions strengthen Hawaiian Electric’s renewable planning as we build toward our commitment to a 100-percent clean energy future. This shows we can scale behind-the-meter energy storage to create a more stable and efficient grid as we provide customers with higher levels of renewable energy to reduce fossil fuel use and greenhouse gas emissions.” [/p

According to Stem, most of the systems are installed in family-operated commercial firms, small businesses, and institutions.

Tad Glauthier, Stem vice president of Hawai‘i operations observed: “Hawaiian Electric and the Energy Excelerator are speeding the adoption of cutting-edge energy technology to benefit the people of Hawai‘i, the environment, and the grid. The rest of the nation is looking at Hawai‘i as a leader in renewables and grid modernization, and Stem is proud to be a part of this important transformation.”

Stem and Hawaiian Electric are continuing to work on the integration of distributed resources on the grid under a new grant from the U.S. Department of Energy, “Sustainable and Holistic Integration of Energy Storage and Solar PV.” Glauthier and Nakafuji will co-present the demonstration findings and talk about next steps on January 31 at DistribuTECH in San Diego, CA.

Stem claims it has secured more than $350 million in financing for its energy storage as a service business model from partners that include Generate Capital, Starwood Energy Group, and Clean Feet Investors.