Portland General Electric's 5-Megawatt Lithium-ion Battery

5-megawatt lithium-ion battery system

Portland General Electric's 5-megawatt, lithium-ion energy storage system was shared as part of PGE's contribution to the Battelle-led Pacific Northwest Smart Grid Demonstration Project.

Half of PGE's $23-million portion of the regional project was paid for with U.S. Department of Energy funds. The regional demonstration is a five-year, $178-million project that launched in 2010.

The battery is part of a microgrid that will enable about 500 southeast Salem customers to tap into a power reserve during electricity disruptions such as blackouts. The battery and microgrid are examples of the innovative technologies and methods being tested through the Pacific Northwest Smart Grid Demonstration Project.

The energy storage system will respond to regional grid conditions with the help of a key aspect of the demonstration called transactive control. Transactive control is based on technology from DOE's Pacific Northwest National Laboratory, which is managed by Battelle. The technology helps power producers and users decide how much of the area's power will be consumed, when and where. This is done when producers and users automatically respond to signals representing future power costs and planned energy consumption. The cost signals originate at Battelle's Electricity Infrastructure Operations Center in Richland, Wash. They are updated every five minutes and sent to the project's participating utilities, including PGE.

The automated signals allow project participants to make local decisions on how their piece of the smart grid project can support local and regional grid needs. Participants are now gathering data to measure how the signal can help deliver electricity more effectively, help better integrate wind power onto the power grid and more. The Salem battery will use the signal to coordinate its charge and discharge cycles with the power grid's supply and demand.

PGE's role: As an investor-owned utility that serves about 830,000 customers in 52 Oregon cities, PGE is testing several smart-grid technologies in the Salem area for the demonstration project. Beyond the energy storage system unveiled today, PGE is working to integrate renewable power sources to the power grid. It is also implementing a demand-response program with residential and commercial customers to help meet peak demand. All these resources will be optimized with the automated transactive control signal.  (Science Daily, 6/1/2013)