Routed, Planned, & Moving Along
Amended Federal Record of Decision
Amended Federal Record of Decision Expected.
Start of Line 1 Construction
Pattern Energy expects to start full construction of Line 1.
RioSol/Line 2 starts Construction
SWPG expects to start full construction of RioSol (Line 2).
Line 1 starts Operating
Pattern Energy expects to complete construction and start operation of Line 1.
Early – Mid 2028
RioSol/Line 2 starts Operating
SWPG expects to complete construction and start operation of RioSol (Line 2).
Revised Final EIS Issued
Line 2 renamed RioSol
SWPG renames Line 2 RioSol to avoid confusion with Line 1 which is called SunZia.
Line 1 is sold to Pattern Energy
SWPG sells SunZia Line 1 to Pattern Energy and keeps Line 2.
Revised Draft EIS issued
BLM issues the Draft EIS for the re-routed Project.
NMRETA joins SunZia as co-development partner
SunZia and NMRETA sign a joint-development agreement.
Federal Permit is re-opened
SunZia submits an amended SF-299 to the BLM to re-start federal permitting for the re-routed portion of the Project.
Line 1 changes to HVDC
SunZia and Pattern Energy agree to change the technical basis for Line 1 from HVAC to HVDCwith 3,000 MW of capacity. Line 2 will now be HVAC with 1,500 MW of capacity.
SunZia and US Military agree on re-route
SunZia and the Dept of Defense agree to re-route a portion of the line in NM that avoids the Northern Call-Up area, north of WSMR.
SunZia selects Anchor Tenant
The Project selects Pattern Energy as anchor tenant for Line 1.
Arizona State Permit is granted
The Arizona Corporation Commission approves a Certificate of Environmental Compatibility for the Project.
Federal Permit is granted
The BLM issues the Record of Decision for the Project.
FERC approves SunZia cost recovery
FERC approves negotiated rate authority for Line 1.
Federal Permitting starts
The Project submits an SF-299 to the BLM to commence federal environmental permitting under NEPA.
Joint Development Agreement signed
SWPG and 4 other companies signed a joint development agreement for the SunZia Southwest Transmission Project.
Start of Project Development
SouthWestern Power Group (SWPG) started planning the development of an interstate transmission project between AZ and NM consisting of two, single-circuit 500kV transmission lines and associated substations.