The difference is clear:

• Faster to build: Clean power projects spent an average of less than a year in development last year, while gas turbines spent two to three years in advanced development and construction.
• Faster to connect: Due to its robust project pipeline, clean power projects take six months to two years to connect to the grid, whereas unplanned gas generators can take an average of five to seven years.

Clean energy is keeping our country’s grid stronger and less reliant on slower, costlier sources of energy. To quickly and affordably meet future energy needs, we need to leverage the speed and low cost of clean energy projects.

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Across the areas most affected by the heatwave, wind and solar generation increased during the highest-demand hours compared to the days before and after the event, providing electricity when it was needed most. Markets with higher levels of clean energy experienced substantially lower wholesale electricity prices, while regions with relatively little clean generation experienced the highest prices despite having tens of gigawatts of clean energy waiting to connect to the grid.

To quantify the value of additional clean energy, 91AVÔ­´´ modeled a scenario in which advanced utility-scale solar, wind, offshore wind, and battery storage projects — totaling 74 GW — currently awaiting interconnection in MISO, PJM, NYISO, and ISO New England had already been operating.

The results were clear:

• More than $170 million in wholesale electricity cost savings during the July heatwave, thanks to clean power.
• Lower reliance on expensive gas, coal, and oil peaking generation.
• Improved system reliability, including avoiding modeled reliability shortfalls during the highest-demand hours.
• Lower wholesale electricity prices across every modeled region.

Extreme weather events are becoming more frequent, and electricity demand continues to rise. This analysis demonstrates that expanding clean power is not simply an emissions strategy — it is a reliability and affordability strategy. Bringing shovel-ready clean energy projects online faster would reduce consumer costs, strengthen grid reliability, and lessen dependence on the most expensive generating resources when Americans need electricity the most.

Resource updated 7/22/2026

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This tightens available supply, requires higher-cost generation to meet demand, and heightens risks to grid reliability. The heatwave clearly demonstrated which systems perform best under pressure—those with a diverse mix of power plants.

Key Takeaways: 

• Overall, clean energy saved the grid more than $114 million during the 3-day heatwave. Wholesale electricity markets with significant wind, solar, and energy storage representation saw lower electricity prices than those without.
• Regions with high clean power penetration kept electricity prices low during the heatwave. When the heatwave hit, more expensive thermal units and imported electricity were required.
• If clean power hadn’t been online, all of ERCOT’s thermal capability would have been needed and may not have been enough to meet electricity demand.

Resource updated 7/1/2026

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