One major component of Grid modernization is the “building out” of the 765 kV grid, the backbone of the grid of the future. Once viewed as a specialized, regionally concentrated voltage class, 765 kV is again at the center of long-range transmission strategies as utilities and regional operators confront load growth, renewable integration, resilience requirements, and interregional congestion.
For utilities, the question is no longer whether ultra-high-voltage (UHV) transmission will play a role in the future grid—but how to approach it strategically, technically, and financially.
Why 765 kV, and Why Now?
At 765,000 volts, this voltage class represents one of the highest AC transmission levels deployed in the U.S. grid. It is optimized for bulk power transfer over long distances with lower losses per megawatt-mile compared to lower voltage alternatives. In practical terms, 765 kV serves as the interstate superhighway of the power system—moving large volumes of generation across regions efficiently and reliably.
Several converging forces are driving renewed interest:
Explosive load growth from data centers and electrification
Rapid expansion of wind and solar generation in remote locations
Increasing interregional congestion
Reliability and resilience concerns following extreme weather events
Policy-driven decarbonization goals
Lower voltage transmission systems—345 kV and 500 kV—remain critical. However, planners are recognizing that incremental additions at those levels may not be sufficient to address long range capacity needs. In many cases, 765 kV can move two to three times the power of a 345 kV corridor using fewer circuits, reducing right-of-way requirements per delivered megawatt.
Who Is Leading 765 kV Expansion?
The leadership landscape is shared between regional transmission organizations (RTOs), experienced utilities, and specialized equipment manufacturers.
Regional Transmission Organizations: The Planning Engine
The most significant momentum behind 765 kV build-outs is coming from organized markets and planning authorities:
PJM Interconnection
PJM operates the largest existing 765 kV network in the country and continues to include 765 kV projects in its Regional Transmission Expansion Plan (RTEP). Load growth in the Mid-Atlantic—particularly from data centers—has elevated the need for backbone reinforcement, including high-voltage corridors spanning multiple states.
Midcontinent Independent System Operator (MISO)
MISO’s long-range transmission planning has identified 765 kV backbone concepts in the Midwest. These projects are designed to integrate large-scale renewable resources while improving reliability and transfer capability across the region.
Southwest Power Pool (SPP)
SPP has advanced plans for a 765 kV regional backbone intended to significantly increase transfer capability compared to existing 345 kV infrastructure. This initiative reflects a strategic shift toward long-distance, high capacity corridors.
ERCOT (Texas)
Although historically dominated by 345 kV infrastructure, Texas is increasingly evaluating 765 kV solutions to accommodate rapid load growth and renewable development in West Texas and other remote areas.
These organizations do not construct assets directly but establish the planning framework, approve needs, allocate costs, and often solicit competitive transmission developers.
Utilities with 675 kV Experience
While many utilities operate high-voltage systems, only a handful have deep 765 kV expertise.
American Electric Power (AEP)
AEP pioneered 765 kV development in the United States and maintains one of the most extensive 765 kV networks. Its historical experience remains foundational to industry standards, design practices, and operational lessons learned.
Xcel Energy
Through SPP planning processes, Xcel has been selected to develop 765 kV facilities, expanding the voltage class into new geographic areas.
Oncor and Other Texas Utilities
As ERCOT explores higher voltage solutions, utilities in Texas are advancing proposals for 765 kV corridors to support load growth and renewable interconnection.
Other investor-owned utilities in PJM and MISO territories are also increasingly engaged as project sponsors or collaborators.
Equipment and Supply Chain Leadership
Ultra-high-voltage equipment manufacturing capacity is limited globally. Suppliers with demonstrated 765 kV experience in transformers, shunt reactors, circuit breakers, and GIS/AIS switchgear play an out sized role. Long lead times—particularly for large power transformers—can exceed 18 to 36 months, making early procurement strategy critical.
Utilities considering 765 kV expansion must view supply chain strategy as a central planning component, not a downstream activity.
“Building out the 765 kV grid network” is not a slogan. It represents a strategic shift toward reinforcing the high-capacity backbone of the U.S. power system.
Leadership today is shared among RTOs driving planning frameworks, experienced utilities executing complex projects, and specialized manufacturers enabling ultra-high-voltage equipment deployment.
For utilities, the path forward requires disciplined planning, regulatory engagement, supply chain foresight, and technical rigor. When approached strategically, 765 kV development can deliver transformative system benefits—moving large scale generation efficiently, strengthening resilience, and supporting the evolving energy landscape.
The next decade will likely determine whether 765 kV becomes a widely expanded national backbone or remains regionally concentrated. Utilities that engage early and execute thought fully will help shape that outcome—and define the future architecture of the American grid.