Geysers By The Numbers

 2021 Statistics

The Geysers Locations

• 75 miles north of San Francisco, California
• 13 Operating Geothermal Power Plants
• 10 Power Plants in Sonoma County; 3 Power Plants in Lake County

Calpine Geothermal Operations

• 28,447 acres (45 square miles) 

Geothermal Wells

• 321 steam wells
• 72 injection wells
• Deepest well: 12,900 feet, or over two miles
• Average well depth: 8,500 feet
• Total Calpine Geysers wells drilled to date: 599
• Today’s Average Grassroots Drilling Time: 82 days (75 days drilling + 7 rig up/down)
• First Exploratory Well: 1920
• First Modern Well: 1955
• 2021 average steam production per well: 35,047 pounds per hour
• Average Reservoir Steam Temperature: 370 degrees Fahrenheit
• Average Flowing Steam Pressure: 84 PSIG
• Most recent steam well drilled: Prati 24 on February 11, 2021
• Most recent injection well drilled: BSC/Beigel on April 6, 2021

Facilities

• 13 operating geothermal plants
• Steam pipelines: 88 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
• 2021 Average Load: 630 net megawatts
• 2021 Generation: 5,519,169 net megawatt hours
• 2021 Average Unit Availability: 90.81%