The United States no longer lacks transmission studies – it lacks transmission construction. A convergence of new analyses from the Department of Energy, FERC, and independent researchers confirms that electricity demand from data centers, manufacturing, and AI is outpacing grid expansion by years, turning a planning challenge into an economic competitiveness risk.
Study Consensus Highlights Accelerating Grid Capacity Shortfall
The DOE’s draft 2026 National Transmission Needs Study, released in late 2024, frames the challenge in stark terms: electricity demand is accelerating from data centers, domestic manufacturing, large industrial loads, and broad economic growth. FERC has responded by focusing on integrating data centers and other large loads into planning processes. Grid Strategies and Americans for a Clean Energy Grid (ACEG) have documented how regional and interregional planning frameworks still fail to produce the cross-border corridors the system needs. ClearPath’s Amping Up the Grid report adds a supply-side lens, modeling that cost-effective expansion requires both new greenfield lines and reconductoring existing corridors with advanced conductors.
What makes this moment distinct is the breadth of agreement. Organizations with different constituencies – federal agencies, industry alliances, clean-energy advocates, and conservative-leaning policy groups – are reaching the same conclusion using different analytical tools. The debate has shifted from whether more transmission is needed to how fast it can be deployed. For much of the last decade, the transmission conversation was tightly bound to renewable integration and decarbonization targets. Those drivers remain, but the aperture has widened dramatically: artificial intelligence workloads, hyperscale data centers, semiconductor fabs, and the reshoring of heavy industry now dominate load-growth forecasts. Resource adequacy, energy security, affordability, and international economic competitiveness have joined carbon reduction as co-equal imperatives.
This convergence reflects a physical reality that has been building for years. The interconnection queue now holds roughly 2 terawatts of generation and storage projects – more than the entire existing US generating fleet – waiting for transmission upgrades. Annual transmission construction has averaged 200-300 circuit-miles of high-voltage line over the past five years, well below the 1,000-plus miles per year that multiple studies indicate is necessary just to maintain reliability, let alone accommodate new load. The gap between identified need and delivered infrastructure is no longer a projection; it is a measured, growing deficit.
Reconductoring and Interregional Planning Emerge as Critical Levers
ClearPath’s modeling underscores a lever that has been underutilized in mainstream planning: reconductoring existing rights-of-way with advanced composite-core conductors can double or triple capacity on many corridors at a fraction of the cost and permitting timeline of greenfield construction. If deployed at scale across the existing 200,000-mile high-voltage network, reconductoring could unlock on the order of 80 gigawatts of additional transfer capability – roughly equivalent to the current installed base of utility-scale solar. That points to a near-term execution strategy that bypasses the most time-consuming steps of new-line development: routing, land acquisition, and multi-year NEPA reviews.
At the same time, the interregional dimension remains the hardest nut to crack. FERC Order No. 1920, finalized in 2024, requires regional planning organizations to evaluate long-term, multi-value transmission projects and consider interregional benefits. But the order stops short of mandating interregional cost allocation or creating a federal siting backstop. Without those mechanisms, the “seams” between planning regions – MISO/PJM, SPP/ERCOT, CAISO/Western markets – will continue to block the most efficient corridors. DOE’s 2023 National Transmission Needs Study estimated that interregional transfer capability needs to roughly double by 2035 to meet reliability and decarbonization goals. Current build rates suggest a shortfall of 50-70 percent against that target.
The economic stakes are rising in parallel. Hyperscale data center campuses now routinely request 100-500 megawatt connections, with some campuses planning gigawatt-scale loads. Semiconductor fabs under the CHIPS Act add similarly lumpy, high-reliability demand. These loads are not flexible; they require firm, 24/7 power and often locate in regions with constrained transmission (e.g., Northern Virginia, central Ohio, Arizona, Texas). That creates a new class of “must-serve” load that cannot be managed through demand response or curtailment, forcing utilities and planners to treat transmission as a binding constraint on economic development rather than a renewables enabler.
By comparison, China has commissioned over 30,000 circuit-miles of ultra-high-voltage (UHV) transmission since 2009, creating a national backbone that moves power from remote renewable bases to coastal load centers. The US has zero commercial UHV lines in operation. While the US system’s decentralized governance makes direct comparison imperfect, the scale differential illustrates the execution gap: a centralized planner can deploy backbone infrastructure in a decade; a fragmented, multi-jurisdictional US process struggles to permit a single 300-mile line in the same timeframe.
Implications for Key Industry Roles
- Utility planner: Load forecasts must now incorporate data center and industrial demand scenarios that exceed traditional IRP assumptions by 20-40 percent; planners should prioritize reconductoring assessments on congested corridors before greenfield alternatives.
- Storage or generation developer: Interconnection queue position is less predictive of commercial operation date than the transmission upgrade schedule; developers should model congestion revenue risk under multiple build-out scenarios and site storage where it can relieve local constraints.
- Policy analyst: The critical policy lever has shifted from study mandates to cost allocation and permitting; focus analytical work on interregional cost-sharing frameworks (e.g., MISO-PJM joint targeted interconnection queue) and state-level siting reforms that preserve local input but set statutory deadlines.
- Investor: Transmission-focused funds face 7-10 year lead times for greenfield equity; reconductoring and dynamic line rating deployments offer 2-4 year cash-flow visibility with lower regulatory risk – allocate capital accordingly.
Milestones That Will Signal Progress or Stagnation
- FERC Order No. 1920 compliance filings from all regional planning organizations (due 2025-2026) – watch for whether interregional projects with multi-value benefits are selected or deferred.
- DOE final 2026 National Transmission Needs Study publication – the final needs designations will trigger federal financing eligibility under the Transmission Facilitation Program.
- First major interregional project permitted under a new federal-state siting coordination framework (e.g., DOE’s Section 216 backstop authority or state-enacted “green corridor” statutes).
- Utility-reported reconductoring mileage and advanced conductor deployments in 2025-2026 FERC Form 1 filings – a leading indicator of whether the lowest-cost lever is being pulled at scale.
- Actual data center energization versus forecast load in key clusters (Northern Virginia, Columbus, Phoenix, Dallas) – divergence will signal whether demand growth is materializing as modeled or being deferred by power constraints.
Bottom Line
The bottleneck has shifted from analysis to execution – and the metric that now matters is not how many studies are published, but how many miles of high-capacity conductor are energized each year.
Read the full report at Energy Central.
Note: facts and figures attributed above to reflect that outlet's original reporting. Broader context, cross-sector connections, and forward-looking scenarios reflect independent analysis by our editorial team.
About this article: Drafted by Energy Ai with AI-assisted research and writing based on public reporting, then reviewed under our editorial process before publication.
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