U.S. Army’s Fort Sill in Oklahoma announced plans to upgrade its HVAC system for 1,700 military homes.

The multi-year energy modernization project will occur over the next three years.

Corvias, an infrastructure and resiliency partner to the U.S. military and higher education institutions, in collaboration with CRC Innovations, an integrated energy and infrastructure solutions pioneer, started the installation of high-efficiency ground source heat pump (GSHP) technology for the project.

Once the project is completed, it will lower  annual electrical consumption up to 40% and natural gas consumption up to 50%.

“By working hand-in-hand with Corvias, we’re making smart, future-focused improvements to Fort Sill’s housing infrastructure,” said Col. Derek Baird, Fort Sill Garrison Commander, in a statement. “These geothermal upgrades reinforce our commitment to energy resilience and independence and the well-being of our residents.”

The project does not require any upfront investment from the Army-Corvias partnership by leveraging an Energy Saving Performance Contract (ESPC) to provide capital improvements.

Fort Sill is one of three Army installations benefiting from this Corvias-led ESPC which will bring $200 million in capital improvements to U.S. Army military housing, including Fort Bragg, North Carolina, and Fort Meade, Maryland. Corvias previously started a $33 million ESPC project at Fort Johnson, Louisiana, expected to be completed later this year.