Battery Storage Projects
Residential Battery Demonstration on Bainbridge Island
In November 2019, PSE began testing behind-the-meter (BTM)* 6kW/15.5kWh battery units on five Bainbridge Island homes. The goals for this project are evaluating back-up power during outages and peak shaving – which is which is a term for reducing power consumption on the electrical grid during periods of high demand.
These lithium-ion, consumer-scale batteries are Sunverge One systems that use a proprietary software platform for operation. Mounted on the side of the home, next to the meter, each battery weighs 725 pounds and is stored in a metal cabinet that measures 76 inches tall, 34 inches wide, and 14 inches deep.
Commercial Battery Demonstration at PSE’s Poulsbo Service Center
In October 2019, PSE installed one behind-the-meter (BTM) 30kW/183kWh battery at its Poulsbo Service Center. This demonstration is designed to simulate the needs and load profile of a commercial customer and help PSE determine internal processes and operating protocols. The project also offers the chance to test peak shaving and demand charge management, as well as develop a quality customer experience.
For the Poulsbo battery, PSE partnered with Northern Reliability to design and install this system that’s housed in a weather-proof cabinet, atop a 7 foot by 14 foot concrete foundation on the service center’s lot. Our plan is to test the battery for at least a year to see how it operates through all four seasons.
Community Battery Demonstration
PSE plans to install one front-of-the-meter (FTM)* battery in a residential neighborhood that already has a high occurrence of customer-owned rooftop solar photovoltaic (PV) technology. The primary purposes of this project will be to manage the integration of excess solar PV electricity back-fed to the grid, form a microgrid, and test back-up power. We’re targeting a late summer 2020 install for this demonstration.
PSE plans to install a 1MW/2MWh lithium-ion battery at Tenino’s Blumaer substation. We also plan to install a 150kW solar array on land PSE owns adjacent to the substation. These installations will complement existing solar panels at Tenino High School, creating a microgrid “island” that the school can operate as an emergency shelter for the city. Currently, we are still in the contracting phase with the Department of Commerce for support through the Clean Energy Fund and expect to begin the installation process in 2020.
In late 2015, PSE installed a 2MW/4.4MWh lithium-ion battery system adjacent to the existing substation in the Whatcom County town of Glacier. The project is funded in part by a $3.8 million grant from the Washington State Department of Commerce, in addition to a $7.4 million investment by PSE. The Glacier demonstration project is designed to perform three primary functions: serve as a temporary back-up power source to “island” a portion of the local Glacier circuit during outages; reduce system load during periods of high demand; balance energy supply and demand, helping to support greater integration.* Front-of-the-meter (FTM) and behind-the-meter (BTM) are terms that describe a battery system’s position in relation to an electric meter. A BTM battery provides power on-site, without passing through a meter. FTM batteries are located on the utility side of the meter.