RioSol Transmission Project

Operational

In Development

RioSol Transmission Project Details

Project Scope	Transmission Line: 550 miles (~350 miles in New Mexico), 500 kV AC line Co-located with SunZia Transmission Line
Capacity	1,500 MW, enough to power 500,000 homes
Investment	RETA and RioSol are co-developers of the project Project cost is $2.4 billion Lease agreement was executed July 2022
Economic Benefit	Increased employment of 2,600 construction and long-term jobs Expected development expenses of $244 million before ground is broken $2.4 billion total project investment will drive $1.2 billion in economic benefit to New Mexico and Arizona over 30 years (2024 Economic & Environmental Consultants economic benefit report)

About the RioSol Transmission Project

RioSol is a high-voltage alternating-current (HVAC) transmission line rated at a capacity of 1,500 MW that runs parallel to SunZia, another RETA project that is the largest renewable energy development project in the western hemisphere. Under development since 2008, it was originally part of the SunZia transmission line project. This second line of SunZia was renamed RioSol after Pattern Energy Group LP purchased the first line of SunZia from SouthWestern Power Group in 2022.

RETA is co-developing this project with SouthWestern Power Group. Based on completion of SunZia, RioSol’s construction will commence in 2026 and will be in service by 2028. The projected in-service date provides New Mexico and Arizona communities the opportunity to tap into wind and solar power ahead of the renewable energy portfolio standard requirements that go into effect in 2040.

RioSol is currently finalizing its interconnection plan, which includes numerous interconnection points in New Mexico. These interconnection opportunities would provide regional reliability and resiliency to the grid and potentially make New Mexico wind power available to New Mexico utilities.