Abuur nooc ka mid ah weedhan adag Shirkadda waxaa la aasaasay 1889 sida Shirkadda Washington Water Power.
Dabcan, qaab kale oo adag oo xukunka ah waa "Shirkadda waxaa la aasaasay 1889 shirkadda Washington Water Power Company, ilaa guddiga agaasimayaashu ay oggolaadeen in magaceeda loo beddelo Avista Corporation, laga bilaabo Janaayo 1, 1999".