Puget Sound faults about 1100 years ago (AD 900—930) an earthquake of magnitude 7+ uplifted Restoration Point and Alki Point, dropped West Point (the three white triangles in the Seattle Basin on the map), caused rockslides in the Olympics, landslides into Lake Washington, and a tsunami on Puget Sound. It extends as far east as (and probably terminates at) the Rattlesnake Mountain Fault Zone (RMFZ; the southern extension of the SWIF) near Fall City. This seems geologically reasonable, as both the SWIF and RMFZ appear to be the contact between Tertiary Crescent Formation basement of Puget Sound on the west and the older
Electricity in the Puget Sound region are among the lowest in the nation at an average 7.6 cents per kilowatt-hour in 2016. Historically this has been due to the large supply from public utility-owned sources. Three investor-owned electric utilities in Washington (Avista (formerly Washington Water Power), PacifiCorp (formerly Pacific Power and Light Company), and Puget Sound Energy (PSE)) are regulated by the Washington Utilities and Transportation Commission (WUTC) which sets rates. Of the three only PSE operates in the Puget Sound area. Public utility districts are independent taxation and regulation authorities and are not regulated by WUTC. All Puget Sound counties except Pierce and King have