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Boise plans to extend its geothermal heating network to a planned affordable housing development with more than 300 homes, with Micron Technology contributing $2.5 million toward the work. The project is expected to break ground in spring 2027 and open in 2028; the city says geothermal heat could cut residents’ utility bills by up to 80%.
Boise plans to extend its geothermal heating network to a planned affordable housing development with more than 300 homes, after Micron Technology contributed $2.5 million toward the expansion. The city says the project could lower future residents’ utility bills by up to 80%, though the housing development is not expected to open until 2028.
The Micron contribution fills a funding gap for extending the network to the development, which is planned for Boise’s Lusk District. The city puts the project’s total cost at about $140 million. The Housing Land Trust Program is partnering with J. Fisher Cos. on the multifamily housing project.
Boise expects construction to break ground in spring 2027, with residents expected to move in during 2028. The $2.5 million is for expanding the geothermal system; the source material does not specify the full breakdown of project funding or how many units will receive geothermal service.
The city says geothermal energy itself is free and estimates the network could save residents up to 80% on utility bills. That figure is a projected maximum, not a guaranteed saving for each household. Actual bills will depend on factors that have not been detailed in the announcement.
Lower Bills for Affordable Housing
Heating costs can add to the monthly burden for households in affordable housing. Connecting the development to a shared geothermal system could reduce that expense, according to the city, while giving Boise a way to use infrastructure it already operates. The potential utility-bill savings are the main direct benefit for future residents, but the city’s estimate is not a promise of a specific reduction for every household.
The plan also links two local priorities: adding affordable homes and extending carbon-free heating. If the project proceeds as scheduled, it will bring the city’s geothermal service to a new residential development rather than limiting it to the existing group of mostly public and commercial buildings.
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Boise’s Existing Geothermal Network
Boise operates what the source report describes as the largest geothermal heating system in the United States. The network distributes naturally heated water from underground at about 177 degrees Fahrenheit to roughly 100 buildings, including the Idaho State Capitol. The planned housing connection would build on that existing system rather than start a separate network.
In February, Bloomberg Philanthropies’ Mayors Challenge awarded Boise $1 million to upgrade the system for affordable housing and explore possible new uses. City communications senior manager Maria Ortega said early-stage technologies could potentially use hot water from the network to provide cooling. That possibility is exploratory; the current housing plan concerns geothermal heating.
Micron, headquartered in Boise, said its contribution reflects its investment in the community. Company executive April Arnzen said the company has had its headquarters in Boise for 48 years. The source report identifies the donation as support for the network expansion, not as the sole funding for either the housing project or the geothermal work.
““Boise has been Micron’s headquarters for 48 years, and investing in this community means investing in the people who call it home.””
— April Arnzen, Micron executive vice president and chief people officer and president of the Micron Foundation
Costs, Savings and Service Details
Several details remain open. The source material does not give a final schedule for building the geothermal connection, a breakdown of the approximately $140 million total project cost, or the number of homes that will receive service. It also does not specify how the city calculated the potential up-to-80% bill reduction or whether that estimate applies to heating costs alone or broader utility bills.
The project remains planned, with groundbreaking expected in 2027. Whether the development and network extension meet the forecast schedule is not yet known. The possible use of the network for cooling is also at an early stage and is separate from the announced heating plan.
Construction Expected in 2027
The next stated milestone is a planned spring 2027 groundbreaking for the affordable housing development. Boise and its partners will need to move the housing and geothermal work from planning into construction before the expected 2028 occupancy. Further information on the funding plan, connection design and projected household costs would clarify how the system will serve residents.
For now, the confirmed development is Micron’s $2.5 million contribution toward extending the network. The city’s savings estimate and opening timeline remain projections until the homes are built and the geothermal service is operating.
Key Questions
What is Boise planning to build?
The Housing Land Trust Program and J. Fisher Cos. are developing a planned multifamily affordable housing project with more than 300 homes in Boise’s Lusk District. The city plans to extend its geothermal heating network to serve the development.
How much is Micron contributing?
Micron Technology gave Boise $2.5 million to help fund the geothermal system expansion. The city estimates the overall project will cost about $140 million; Micron’s donation is not the full project budget.
How much could residents save on utility bills?
The city says geothermal service could reduce residents’ utility bills by up to 80%. That is a projected maximum, and the source material does not explain the calculation or guarantee a saving for individual households.
When will the homes be ready?
The development is expected to break ground in spring 2027 and be ready for residents in 2028. Those dates are projections, not completed milestones.
Will the geothermal system provide cooling too?
Boise is exploring whether early-stage technologies could use the network’s hot water to provide cooling, according to city communications senior manager Maria Ortega. That option is under exploration; the announced housing plan is for geothermal heating.
Source: canarymedia.com
