Geysers By The Numbers

The Geysers Geothermal Field 2017 Statistics

The Geysers Locations

  • 75 miles north of San Francisco, California
  • 10 power plants in Sonoma County: Aidlin, Sonoma, McCabe, Ridgeline, Eagle Rock, Cobb Creek, Sulphur Springs, Lake View, Socrates and Grant
  • power plants in Lake County: Big Geysers, Quicksilver and Calistoga.


Calpine Geothermal Operations

  • 29,000 acres (45 square miles)

Geothermal Wells

  • 322 steam wells
  • 54 injection wells
  • Deepest well: 12,900 feet, or over two miles
  • Average well depth: 8,500 feet
  • Total Calpine Geysers wells drilled to date: 591
  • Today’s Average Grassroots Drilling Time: 85 days (75 days drilling + 10 rig up/down)
  • First Exploratory Well: 1920
  • First Modern Well: 1955
  • 2017 average steam production per well: 36,036 pounds per hour
  • Average Reservoir Steam Temperature: 374 degrees Fahrenheit
  • Average Flowing Steam Pressure: 80.7 PSIG
  • Most recent steam well drilled: Prati 31, January 2017
  • Most recent injection well drilled: CMHC8, May 11, 2017

Facilities

  • 13 operating geothermal plants
  • Steam pipelines: 80 miles
  • Injection water lines: 69 miles
  • 21kV power lines: 70 miles
  • Project roads: over 167 miles

Water Injection

  • Two large-scale wastewater injection projects provide an average 15.09 million gallons daily (MGD)
    • Santa Rosa Geysers Recharge Project Average: 11.69 MGD
    • Calpine Southeast Geysers Effluent Pipeline Average: 3.4 MGD
    • Calpine + Northern California Power Agency: 7.00 MGD

Power Generation

  • First commercial power plant: Unit 1, Startup - September 1960
  • Most recent plant built: Aidlin, 1989
  • 2017 Average Load: 647.7 net megawatts
  • 2017 Generation: 5,673,647 net megawatt hours
  • 2017 Average Unit Availability: 94%

Visit The Geysers

Visit the Calpine Geothermal Visitors Center in Middletown, California, Wednesdays through Saturdays from 11:30 a.m. to 5 p.m. (admission is free).

Sign up for a free geothermal power plant tour led by an experienced Calpine team member. View the schedule and register for a tour by visiting www.geysers.com or call 1-866-GEYSERS or 707-987-4270 for more information.