Hudson Ranch
Location: CA
Operator: EnergySource LLC
Configuration: 1 X 49.5 MW
Operation: 2012
T/G supplier: Fuji
EPC: AMEC, Performance Mechanical Contractors
Quick facts: The Hudson Ranch-I plant in Imperial Co was synchronized on 1 Mar 2012, the first new geothermal plant in the Salton Sea area in 20yrs. The Salton Sea GRA is a very hot and extremely permeable liquid-dominated resource, with high minerals concentration. Construction of the $400mn plant began in May 2010. The project has three production wells and four injection wells. All energy, capacity and environmental attributes are sold to Salt River Project for a term of 30yrs. In late 2011, SRP announced a second PPA for the 49.9-MW Hudson Ranch-II. The phase one project created more than 200 jobs during construction and will have an operating staff of about 55.

Photograph courtesy of EnergySource LLC
Posted 10 Mar 2012

NCPA-2
Location: CA
Operator: Northern California Power Agency
Configuration: 2 X 55 MW
Operation: 1985-1986
T/G supplier: Ansaldo
EPC: Dravo

Photograph courtesy of Power
Posted 19 Feb 2005

Puna
Location: HI
Operator: Ormat Technologies Inc
Configuration: 10 X 3 MW
Operation: 1993
T/G supplier: Ormat
EPC: Ormat
Quick facts: This is Hawaii’s first commercial geothermal power plant. It is located on the lower east rift zone of Kilauea Volcano atop lava flows erupted in 1955. As of 2002, the plant had three production wells drilled to depths between 1,220m and 1,830 m. Geothermal steam and brine is brought to the surface and routed through binary generating modules. Brine, condensed steam, and other gases are injected back into the ground via three wells to depths between 1,830m and 2,134m.

Photograph courtesy of U.S. Geological Survey
Posted 7 Jan 2007

Raft River
Location: ID
Operator: US Geothermal Inc
Configuration: 16 MW
Operation: 2007
T/G supplier: Ormat
EPC: Ormat
Quick facts: The Raft River geothermal resource is located in Idaho, 200mi southeast of Boise at the site of a former U.S. Department of Energy installation. DOE's 7-MW plant was the first commercial-size, binary-cycle geothermal power plant in the world and was successfully constructed, and tested at this site in 1980-1982. Over $40mn was invested in studies and geothermal infrastructure. US Geothermal owns and/or leases approximately 10.8mi² in the area with a proven geothermal reservoir which may be capable of producing up to 110 MW according to estimates from GeothermEx Inc. The Raft River project has a 10-MW, 20yr PPA with Idaho Power Co and US Geothermal has reserved 36 MW of capacity on a 138kV transmission line adjacent to the project. Construction began in Jun 2006 and the plant reached full power on 3 Jan 2008. The site has 5 production wells and 4 injection wells.

Photograph courtesy of Power
Posted 12 Jan 2008

Stillwater-1
Location: NV
Operator: Amp Resources
Configuration: 14 X 1.25 MW
Operation: 1989 (ret)
T/G supplier: Ormat
EPC: Ormat
Quick facts: The original Stillwater facility was taken out of service by new owner Enel Green Power North America and replaced with a new 32-MW installation in 2009. Photo is dated Jun 1989.

Photograph by Larry Garside and courtesy of Nevada Bureau of Mines and Geology
Posted 21 Sep 2011

Thermo
Location: UT
Operator: Raser Technologies Inc
Configuration: 14 MW
Operation: 2008
T/G supplier: UTC Power
EPC: Raser
Quick facts: Also known as Lightning Dock, this was the first new geothermal plant in Utah in over 20yrs. The Beaver Co site was selected as it was on private lands and had an existing production well. Raser has a 20yr PPA with Anaheim Public Utilities for palnt output. The plant cost about $35mn and was built in less than 6mos with 50 modular, PureCycle binary units from UTC. This was the launch, commercial-scale application for these machines.

Photograph courtesy of Power
Posted 28 Jan 2009

West Ford Flat
Location: CA
Operator: Calpine Corp
Configuration: 2 X 13 MW
Operation: 1988
T/G supplier: MHI, Electric Machinery
EPC: S&W, TIC
Quick facts: This is one of 22 power stations at The Geysers, the largest geothermal complex in the world.

Photograph courtesy of Power
Posted 13 Aug 2005