Red RockMissile Base
← All projects

Transmission Line

RioSol Project

Entities

Owner: El Rio Sol Transmission, LLC MMR Group, Inc

Status Pre-Planning

Synopsis

RioSol to Saguaro Interconnect is a transmission-only Arizona interconnection segment associated with the broader RioSol/SunZia corridor.

The project-specific docket is Case 249, not the older SunZia docket. This interconnect is not itself a solar or battery facility.

The community tracker currently labels this project Pre-Planning. The dated record and official links below should be used to check that label and any later change.

Timeline & Milestones

Scroll or swipe to explore

  1. Completed Initial profile public process

    Line Siting Committee — El Rio Sol / RioSol to Saguaro interconnection hearing

    Evidentiary hearing (LS-249) on the RioSol-to-Saguaro interconnection. Applicant El Rio Sol Transmission, LLC. Testimony at that hearing pointed to construction late 2026 and in-service 2028.

    Line Siting Committee — El Rio Sol / RioSol to Saguaro interconnection hearing

    Evidentiary hearing (LS-249) on the RioSol-to-Saguaro interconnection. Applicant El Rio Sol Transmission, LLC. Testimony at that hearing pointed to construction late 2026 and in-service 2028.

    Full date and time
    Monday, October 6, 2025
    Status
    Completed

    Related projects: RioSol Project

    Related entities: MMR Group, Inc, El Rio Sol Transmission, LLC

  2. Completed Researched project record

    BLM review began

    Federal corridor review started.

    BLM SunZia Southwest Transmission Project
  3. Completed Researched project record

    BLM Notice of Intent

    Formal federal review notice issued.

    BLM SunZia Southwest Transmission Project
  4. Completed Researched project record

    BLM Record of Decision

    Federal corridor decision completed.

    BLM SunZia Southwest Transmission Project
  5. Completed Researched project record

    Arizona CEC application filed

    Case 249 opened.

    ACC Docket L-21328A-25-0186-00249
  6. Completed Researched project record

    Case 249 hearings opened

    Hearings were held October 6–7.

    Line Siting Case 249 notice
  7. Approved Researched project record

    ACC approved CEC 5-0

    Commission approval vote.

    ACC Docket L-21328A-25-0186-00249
  8. Approved Researched project record

    Decision 81565 issued

    ACC decision issued.

    ACC Docket L-21328A-25-0186-00249
  9. Proposed Researched project record

    Applicant projects late-2026 construction

    Projection, not a completed fact.

    RioSol to Saguaro Interconnect
  10. Proposed Researched project record

    Applicant projects 2028 in-service

    Projection, exact date unknown.

    RioSol to Saguaro Interconnect

How to get involved

How to participate in RioSol Project — L-21328A-25-0186-00249; Case 249; Decision 81565; DOI-BLM-NM-0000-2021-0001-RMP-EIS

Use the verified project record and monitor the correct agency for the next live notice.

Use the Case 249 docket for Arizona records. The BLM SunZia NEPA process is complete.

  1. Save the exact identifiers: L-21328A-25-0186-00249; Case 249; Decision 81565; DOI-BLM-NM-0000-2021-0001-RMP-EIS

    Use L-21328A-25-0186-00249; Case 249; Decision 81565; DOI-BLM-NM-0000-2021-0001-RMP-EIS in searches, subject lines, comments, and records requests. Do not substitute a similarly named project or general-policy docket.

  2. Read the project-specific record

    Open the official record linked below and verify the present status, scope, meeting location, submission method, and deadline before acting.

  3. Treat old deadlines as closed

    The October 6, 2025 special comment session and intervention deadlines are closed; no current BLM window is shown.

  4. Monitor the next live notice

    Monitor Case 249 and use the ACC portal for docket-specific comments. Check the BLM project page for any later federal notice.

Additional Resources

Upcoming

No upcoming events currently posted.

Past events

Line Siting Committee — El Rio Sol / RioSol to Saguaro interconnection hearing

Evidentiary hearing (LS-249) on the RioSol-to-Saguaro interconnection. Applicant El Rio Sol Transmission, LLC. Testimony at that hearing pointed to construction late 2026 and in-service 2028.

Full date and time
Monday, October 6, 2025
Status
Completed

Related projects: RioSol Project

Related entities: MMR Group, Inc, El Rio Sol Transmission, LLC