The Avista utility is using a $3 million state grant to test using large batteries to store electricity generated by wind and solar power.

The Avista utility is using a $3 million state grant to test using large batteries to store electricity generated by wind and solar power.

The company says the battery storage system at a Pullman substation will be able to store enough electricity to power about 100 homes for up to three hours.

The Spokesman-Review reports (http://bit.ly/1jdJgSC ) the Spokane-based utility could expand the use of batteries if the test is successful.

Utility officials are looking for a way to even out the supply of electricity generated by the intermittent wind and solar sources.

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Information from: The Spokesman-Review, http://www.spokesman.com