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Recent studies and forecasts reveal a complex energy transition: utility-scale solar is set to outgenerate coal in Texas’s ERCOT grid by 2026, driven by rapid solar buildout and rising electricity demand, while coal and gas still supply much of the remaining power. At the same time, UK research shows aerosols—about half from coal-derived SO2—are shaving solar output globally, costing roughly 6% of potential generation in 2023 and leaving a larger regional burden in China. Together these stories highlight diverging trends: solar’s rapid expansion and grid gains, but also the lingering climate and air-pollution legacy of coal that reduces renewable yields and underscores benefits of emissions controls.
Tech professionals must plan for changing grid dynamics as utility-scale solar grows rapidly, affecting demand profiles, grid stability, and asset planning. Air-pollution impacts from coal also reduce solar output, altering yield forecasts for PV deployments and analytics.
Dossier last updated: 2026-05-22 22:17:47
U.S. electricity generation is shifting as rapidly expanding utility-scale solar and increased hydroelectric output are displacing coal on the grid. Analysts and grid data show coal-fired generation has declined while renewables — led by a surge in large-scale solar installations and stronger hydro flows — are filling the gap, reducing emissions and altering power market economics. The trend affects utilities, grid operators, and fossil-fuel plant owners facing lower utilization and revenue, while accelerating investment in transmission and storage to integrate variable renewables. This transition matters for energy policy, grid reliability planning, and companies involved in clean power, batteries, and grid modernization.
US grid data for Q1 2026 show renewables—especially solar—pushing coal further off the grid: solar generation jumped 24% year-over-year and renewables (wind, solar, hydro) grew 11%, outpacing the modest 1.5% rise in overall demand. Fossil fuel generation fell about 3% overall, with coal dropping over 10% while natural gas edged up slightly. An unexpected 22% surge in hydro output—likely from early snowmelt in the western US rather than new capacity—matched solar’s absolute growth and could reverse later if reservoirs are depleted. Renewables plus nuclear now supply over 45% of US electricity, underscoring the shifting generation mix and implications for utilities, grid planning, and energy markets.
A UK research team used a new global solar-facility inventory—augmented with AI-analyzed satellite imagery and crowdsourced location data—to estimate sunlight losses from clouds and aerosols and found significant impacts on solar output. In 2023 over a quarter of potential solar generation was lost: ~20% from clouds and ~6% from aerosols, amounting to ~500 TWh (equivalent to 84 1 GW coal plants). Aerosols alone cost roughly 75 TWh annually of newly installed capacity on average in the five years before 2023. The study attributes about half of aerosols to coal-derived SO2 and finds strong regional variation: China sees much larger aerosol-driven losses (7.7% overall, with ~30% of those losses from coal) versus ~3% in the U.S. The findings link air pollution and fossil-fuel use to reduced renewable energy yield, highlighting cross-sector impacts and the potential upside of pollution controls.
The U.S. EIA forecasts that in 2026 utility-scale solar generation in ERCOT will surpass coal for the first time, reaching 78 billion kWh versus coal’s 60 billion kWh. Solar’s share in ERCOT rose from 4% (2021) to 12% (2021–2025 average) while coal fell from 19% to 13%; natural gas remains dominant. Texas is expected to receive about 40% of U.S. solar capacity additions in 2026, including the 837 MW Tehuacana Creek 1 solar-plus-BESS project. No new coal plants are planned in ERCOT. Rising electricity demand from crypto mining, data centers, and industrial activity is driving capacity additions. EIA projects solar will continue to outgenerate coal in most months through 2027.