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The Union of Concerned Scientists (UCS) recommends that Maine's offshore wind procurement process prioritize larger nameplate capacities to maximize grid reliability. Based on an analysis of winter seasons from 2000 to 2022, UCS found that offshore wind fleets of 1500 MW, 4000 MW, and 8000 MW could substantially reduce the number of days the New England grid faces elevated energy shortfall risk. The document argues that offshore wind is an ideal solution for winter reliability because its output typically increases during cold snaps, unlike fossil fuel supplies which are subject to global market volatility and import constraints.

The document examines the vulnerability of the US gas-fired power plant fleet to extreme winter and summer weather, noting that gas plants are the primary source of generation failures during major storms. It argues that current resource adequacy metrics overvalue gas reliability and recommends transitioning to probabilistic modeling, increasing transparency, and prioritizing renewables, storage, and demand-side solutions to ensure a resilient power grid.

The report argues that EPA's regulation of greenhouse gas (GHG) emissions from existing power plants under Section 111(d) of the Clean Air Act will not jeopardize electric system reliability. Unlike the unit-specific MATS rule, Section 111(d) employs a 'cooperative federalism' model, allowing states to develop State Implementation Plans (SIPs) with significant flexibility. This includes 'inside the fence' options like heat-rate improvements and 'outside the fence' options such as emission-averaging, carbon budgets, and demand-side reductions. The author notes that current industry conditions—including low natural gas prices, underutilized natural-gas-fired combined-cycle (NGCC) capacity, flat electricity demand, and the growth of renewables—provide a buffer that supports reliable compliance. The report concludes that as long as EPA, states, and industry engage in timely planning, the regulatory framework provides sufficient latitude to maintain power system adequacy and security.