Current Customers

Thank you for choosing geothermal energy for your heat source. Please login for account information.


Geothermal Emergencies

For updates or information if a geothermal system outage occurs, please call (208) 608-7200 then press "2" to listen to a recorded message.

TTY: (800) 377-3529

10th Street Geothermal Construction Notice

The City of Boise is replacing aging sections of the geothermal system in Downtown Boise. These improvements will advance system reliability and allow for future growth and expansion of this clean, renewable resource. This important project is funded through American Rescue Plan Act funding, which requires funding to be spent by 2025. The City of Boise recognizes the disruption caused by construction to downtown visitors, employees, and businesses and is committed to ensuring open lines of communication through this effort to reduce the impact.

Please email with any questions about 10th Street.

Geothermal construction map

Updated Construction Schedule

April 29 - May 10 | GROVE TO MAIN

  • Full closure of 10th street between Grove and Main
  • 2 weeks (COMPLETED)

  May 28 - June 21 | MAIN ST FROM 10TH ST TO 11TH ST

  • Partial Main Street closure from 10th to 11th.
  • 4 weeks

  June 24 - June 28 | 10TH & MAIN INTERSECTION

  • Partial closure of 10th Street and Main Intersection
  • 4 weeks

  July 1 - 19 | MAIN TO IDAHO

  • Full 10th Street closure between Main and Idaho
  • 2 weeks

  July 22 - August 8 | IDAHO TO BANNOCK

  • Full 10th Street closure between Idaho and Bannock
  • 3 weeks

  August 12 - 30 | BANNOCK TO JEFFERSON

  • Full 10th Street closure between Bannock and Jefferson
  • 3 weeks

  September 2 - 4 | MAIN ST FROM 10TH ST TO 11TH ST

  • Partial closure of Main from 10th to 11th.

How Geothermal Works

Deep below our earth’s surface runs a natural resource that the City of Boise has been utilizing for more than a century. A river of geothermally heated water flows under our city’s foothills. From heating buildings to sidewalk snowmelt and warming recreational pools, the City of Boise’s geothermal heating utility is innovative, renewable – and sustainable to the core.

Why Geothermal

Competitive Advantage

Adding this to a list of your building’s sustainability factors increases attraction, differentiation, and marketability to tenants and their employees.

Value-Driven Choice for Heating Your Building

Compared to other utility choices, geothermal is not impacted by volatility in natural gas prices. The City of Boise’s dependable heating district is powered by a completely renewable natural resource – right under our feet.

Join the Nation's Largest Geothermal Heating Utility

Hands-on expertise from city staff can help optimize your own building’s system, while incentives make signing up easy.

Sustainable to the Core


The largest in the country, the City of Boise’s geothermal heating utility delivers the naturally heated 177° water through a network of pipes that as of 2019 warmed more than 6 million square feet of building space – a number that’s growing rapidly.

Local and Renewable

A truly closed-loop process, after the water is circulated through the heating district it’s safely added back into the aquifer.


Minimal electricity is required to power the system’s pump, with no fossil fuels used at any step in the process, this keeps the environmental impact of this resource lower than other heating options.

Where You Can Find It

Beneath the streets of Boise are over 20 miles of pipeline that heat over 6 million square feet. All over downtown, you'll find these plaques in buildings; including JUMP, City Hall, Treasure Valley YMCA, Boise State and more. 

History of Boise's Geothermal

Boise has used geothermal heat since the 1890s to heat Victorian homes and the original Natatorium. Back then, the cost to use the geothermal heat was just $2 a month for smaller homes and $3 a month for large homes. In 1983, the City of Boise started the beginnings of the Geothermal Heat system that is now a part of the largest, municipally-operated system in the country, heating over 90 buildings throughout downtown Boise.

Boise Warm Springs Water District

If you live within the Warm Springs District boundary, please contact the Boise Warm Springs Water District for geothermal information.

Warm Springs District boundary Map

Contact the District

Message Sent Successfully!

Message Failed To Send.

Send a Message to Geothermal

Thank you for your interest in Boise's geothermal system. Please fill out the form below and a representative from Public Works will be in touch with you.