Hidden Mountain Extension Project

Operational

In Development

Hidden Mountain Extension Project Details

Project Scope	Extension Line: 21 miles, 345 kV alternating current (AC) line
Capacity	1,000 MW, enough to power more than 330,000 homes
Investment	RETA and Agua Fria LLC are co-developers of the project Lease agreement was executed in June 2025
Economic Benefit	Generate 20 to 30 local construction jobs Income to landowners Connection between PNM’s transmission system and RioSol Transmission

About the Hidden Mountain Extension Project

RETA has entered into a development and lease agreement with Agua Fria LLC for co-development of the Hidden Mountain Extension Project, located within Valencia County and running parallel to a portion of the PNM Western Spirit transmission line.

The project will connect the RioSol Transmission Line with PNM’s transmission system, enabling the transportation of up to 1,000 MW of renewable energy, helping to avoid an estimated 3.6 million metric tons of CO₂ emissions annually.

The project is slated for completion by December 2028.