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Energy Brief

Grid interconnection bottlenecks and refinery capacity shifts shape energy security

Today’s reporting points to tightening energy security signals on both the supply and the grid-connections side. U.S. refining capacity declined during 2025, reducing a key domestic link in fuel supply resilience. At the same time, PJM’s resistance to changing its fast-track interconnection waiver rules for a large gas project highlights how interconnection processes can constrain new capacity when demand for dispatchable generation is rising.

On the transition and demand-management front, state-level policy momentum continues to lower energy use through electrification and efficiency while expanding solar deployment pathways (including community solar, faster residential permitting, and defined agrivoltaics rules). These measures can partially offset broader infrastructure constraints, but the near-term reliability and timing of generation additions remain critical given the interconnection and supply-capacity signals.

Top Signals

1. U.S. refining capacity decline reduces domestic fuel supply resilience

Signal strength: Developing

A drop in operable refinery capacity can reduce buffer against supply disruptions and increase vulnerability to upstream shocks, potentially lifting downstream fuel-price and outage risks. For energy executives, this affects procurement strategy, hedging assumptions, and risk planning for refined products.

Supporting evidence

  • U.S. refining capacity decreased during 2025 — EIA Today in Energy, 2026-06-29. Reports operable atmospheric distillation (a primary refinery-capacity measure) totaled 18.2 million b/cd on Jan 1, 2026, down over 250,000 b/cd (~1%) vs a year earlier—indicating reduced domestic refining throughput capacity.

2. PJM limits fast-track interconnection waivers for gas capacity—timing risk

Signal strength: Early

Interconnection rules directly shape how quickly dispatchable generation can enter the market. PJM’s stance against a waiver for a $2B gas-fired plant signals potential delays and rejections within fast-track processes, affecting resource adequacy planning, investment pacing, and contract timing.

Supporting evidence

3. State policy accelerates electrification and solar deployment via permitting, incentives, and community programs

Signal strength: Developing

Multiple states are tightening the policy levers that speed adoption of solar and all-electric homes (including automated permitting and community solar). This can improve load forecasts, grid planning assumptions, and investment pipelines for residential and distributed energy—though execution still depends on grid readiness.

Supporting evidence

  • Connecticut’s new solar law is better than nothing — Canary Media, 2026-06-30. Highlights a package intended to boost solar including extended renewable incentives, a new community solar program, authorization of plug-in solar, and requirements for automated residential solar permitting—signals policy momentum to expand distributed generation faster.
  • Vermont is boosting new homes that can cut energy use in half — Canary Media, 2026-06-30. Describes delivery of superefficient, all-electric, heat-pump-equipped manufactured homes that slash energy use by more than half—supporting an electrification + demand-reduction trajectory.

4. Efficiency spending focus shifts toward affordability and public-benefit targeting

Signal strength: Developing

Efficiency is emerging as a direct bill-reduction and equity tool, not just a decarbonization measure. For executives, this affects program design, utility cost recovery expectations, and potential partnerships for low-income and institutional energy upgrades.

Supporting evidence

5. Solar expansion moves into regulated agrivoltaics—formalizing farmer-flexibility requirements

Signal strength: Early

Defining agrivoltaics can reduce permitting uncertainty and unlock new solar siting while addressing operational needs for agriculture. This creates a clearer project pipeline for developers and influences how land-use and permitting constraints may ease over time.

Supporting evidence

Supporting Stories

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