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PGE showcases 5MW Li-ion grid energy storage system; transactive control

Portland General Electric showcased its 5 MW lithium-ion energy storage system to the public today at the utility’s Salem Smart Power Center in South Salem, Ore. The energy storage facility is 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 US Department of Energy funds. The regional demonstration is a five-year, $178-million project that launched in 2010.

The battery is part of a highly reliable, localized power zone called 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 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.



The units are not right. 5MW is power not energy. Did they mean 5 MWH which would be energy? The units they really should be using are Joules which are Watt seconds. IE, 5MW equals 18000MJ or 18GJ


There's nothing wrong with the units.  If the storage system is capable of 5 MW of output, it can power 5 MW of loads even if the supply line goes down.  The stored energy is only relevant insofar as it is sufficient to supply demand until line power returns.


According to NREL, the system is a 5 MW capacity system with only 1200 kWh of energy - so it could only operate at full capacity for 15 minutes.


15 minutes is plenty of time to command the DSM systems to turn off HVAC and water heaters, shed other interruptible loads, try to reconnect the line, and start emergency generators.  Most customers wouldn't notice.

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