Transmission Reliability
Western Area Power Administration owns and operates more than 17,000 circuit miles of transmission lines, 258 substations and other electric power facilities in its 15-state service territory. To ensure reliable electric service, this system must be maintained and periodically upgraded. Also, facilities may need to be added or expanded to meet new demands.
Proposed Projects
The following are proposed construction projects on WAPA’s transmission system in which WAPA will participate, either as the lead agency or as a partner:
Headquarters
- Decision to join the Western Energy Imbalance Service Market (PDF 132KB)
- Proposal to Remove Price Caps and Modify the Open Access Transmission Tariff (PDF 160KB)
- Proposal to update and modify Open Access Transmission Tariff (Revision 19-01) (PDF 100KB)
Colorado River Storage Project
Desert Southwest Region
Please see WAPA DSW’s Environmental Review page for additional projects and information.
- Arizona Peaking Capacity Energy Storage Project, DOE/EA-2123
- Headgate Rock-Blythe No. 1, 161-kV Transmission Line Pole Replacement, AZ and CA, DOE/EA-1427
- Parker-Gila 161-kV Transmission Line Relocation, AZ, DOE/EA-1487
- Southline Transmission Project, AZ and NM
- TransWest Express Transmission Project
- Fall Protection Training Facility – Phase I (PDF 214KB)
Rocky Mountain Region
- Beaver Creek-Hoyt-Erie Transmission Line Rebuild, CO, DOE/EA-1508
- Cheyenne-Miracle Mile and Ault-Cheyenne Transmission Line Rebuild Project, CO, DOE/EA-1456
- Estes-Flatiron Transmission Lines Rebuild Project
- Granby Pumping Plant-Windy Gap Transmission Line Rebuild Project
- Lovell-Yellowtail and Basin-Lovell Transmission Line Rebuild Project
- Maintenance and Vegetation Management along Existing WAPA Transmission Line Rights of Way on National Forest System Lands in Colorado, Utah, Nebraska
- Platte River Cooperative Agreement PEIS, NE, CO and WY, DOE/EIS-0295
- San Juan Basin Energy Connection Project, BLM EIS [energy.gov] (cooperating agency)
- TransWest Express Transmission Project
- Windy Gap Firming Project
Sierra Nevada Region
- San Luis Transmission Project (SLTP)
- Coulsa Sutter Project (CoSu)
- Beale-WAPA Interconnection Project (BWIP)
- SN Exploration of Energy Imbalance Market (PDF 1MB)
Upper Great Plains Region
Last modified on May 11th, 2026