Much of New Mexico Tribal Land Is Ripe for Geothermal

Estimated reading time: 5 minutes · Last updated: 2026-08-17

Rebecca “Puck” Stair, director of the Energy Conservation and Management Division at the New Mexico Energy, Minerals and Natural Resources Department, told the interim Indian Affairs Committee that much of the state’s tribal, nation and pueblo land could be suitable for geothermal development. She based her testimony on geological assessments, including a 2025 report from Project InnerSpace with New Mexico Tech and the New Mexico Bureau of Geology and Mineral Resources. As first reported by Source New Mexico, Stair emphasised geothermal’s low water demand and potential to generate revenue and strengthen energy sovereignty for tribes while helping meet the Energy Transition Act’s renewable targets.

If you’re using geothermal, the heat beneath our feet to generate electricity, that’s wonderful.

Rebecca “Puck” Stair, Energy Conservation and Management Division director, New Mexico Energy, Minerals and Natural Resources Department

How the geological case for tribal development was made

State energy officials and academic teams presented the same technical starting point: deep heat exists under broad tracts of land in New Mexico, and a 2025 assessment singled out many tribal holdings as having attractive subsurface temperatures. That 2025 study is credited to Project InnerSpace, New Mexico Tech and the New Mexico Bureau of Geology and Mineral Resources. The report frames geothermal not only as a source of low‑carbon electricity but also as a way to expand local jobs and give tribal governments new revenue streams.

Geothermal, in this context, means using naturally hot rock and fluids beneath the surface to produce steam or to drive heat-exchange systems that generate electricity or deliver direct heat. Stair emphasised geothermal’s relatively low demand for surface water compared with some other thermal technologies, a point the report echoes as relevant to arid regions and to tribal communities that prioritise water security.

Who is already operating and where the first projects sit

New Mexico already hosts at least one commercial geothermal site: Lightning Dock, near Lordsburg, is identified in the source as the state's lone utility-scale geothermal facility. PNM, the state's largest electric provider, has publicly said it tapped a southern New Mexico geothermal site to make electricity by using subsurface heat to produce steam that turns turbines. Those operations serve as both a technical proof of concept and a set of regulatory and transmission precedents that new tribal projects would inherit or need to adapt.

Local experience matters because early projects test how permitting, surface access and grid connections work in practice. For tribes considering development, developers and utilities will point to Lightning Dock and to PNM’s cited southern plant as models for technology selection, permitting timelines and potential revenue streams, but tribal leaders will also need clear, project‑level data before committing land or capital.

Policy drivers: the Energy Transition Act and tribal energy sovereignty

State policy frames much of the urgency. The Energy Transition Act, signed in 2019, sets concrete renewable targets for utilities: 50 percent by 2030, 80 percent by 2040 and 100 percent by 2045. Stair and other witnesses told lawmakers geothermal could help utilities and communities meet those deadlines while offering tribes greater energy sovereignty—control over local generation, revenue and resilience.

Representative Patricia Roybal Caballero (D-Albuquerque) urged collective tribal action, proposing that New Mexico’s 23 tribes, nations and pueblos consider pooling resources to create a shared geothermal development group. That idea links technical opportunity to governance: centralised development can lower costs and speed permitting, but it also raises questions about benefit allocation, decision rights and how projects would be governed across sovereign tribal authorities.

Practical hurdles: grid access, permitting and tribal coordination

Geothermal projects face a different set of barriers than wind or solar. Initial drilling costs and exploration risk are high because subsurface heat must be confirmed at depth before a full plant is built. Transmission capacity and where a project ties onto the grid matter: many promising heat resources sit far from major load centres, which raises the cost of connecting to the system and of meeting utility interconnection rules.

Permitting across federal, state and tribal jurisdictions can add time and uncertainty. The Project InnerSpace report and Stair’s testimony both point to the need for data and mapping, and for legal and contractual templates that tribes can use to manage partnerships with developers or utilities. That administrative work is a precondition for converting mapped potential into operating megawatts.

How geothermal on tribal land could play out

The bottom line

The technical case for geothermal on New Mexico tribal land is now explicit in state testimony and in a 2025 assessment by Project InnerSpace and academic partners. Turning mapped heat into operating projects will hinge on exploration financing, clear transmission paths and durable governance structures that respect tribal sovereignty. Lawmakers and tribal leaders are discussing pooled approaches; the next step is project‑level data releases and legal frameworks that let tribes decide whether to develop, partner or conserve these subsurface resources.

What to watch

• Watch for any formal recommendations from the interim Indian Affairs Committee; no date has been set for a final committee vote.
• Watch utilities’ plans and filings that set out how they will meet the Energy Transition Act goal of 50 percent renewable energy by 2030.
• Watch for follow-up mapping or dataset releases from Project InnerSpace or the New Mexico Bureau of Geology that quantify acreage of high subsurface heat on tribal lands; no release date has been set.