Weather Demand Risk in Texas: How Temperature Drives ERCOT Prices

No single factor drives ERCOT price volatility more consistently than weather. Texas extreme temperatures — both summer heat and winter cold — create demand surges that can push electricity prices from typical levels of $25-50/MWh to hundreds or thousands of dollars per megawatt-hour within hours. Understanding the temperature-price relationship is the starting point for energy risk management in Texas.

The Summer Heat Pattern

Texas summer energy risk follows a consistent pattern. As temperatures rise above 90°F, residential and commercial air conditioning demand increases. Above 95°F, demand accelerates as cooling systems run continuously. Above 100°F, statewide demand can reach near-peak levels, and ERCOT afternoon settlement prices rise accordingly. Days where temperatures remain above 95°F for consecutive days are higher risk than single-day events, as there is no overnight recovery.

The Afternoon Peak Window

Summer ERCOT price volatility is concentrated in the afternoon peak window from approximately 2:00 PM to 7:00 PM CDT. Solar generation peaks around noon and then declines through the afternoon, while demand remains high and residential air conditioning reaches peak load. This combination of declining supply and sustained demand creates the highest-risk pricing window of each summer day.

Using Weather Forecasts for Advance Planning

Texas Grid Intel integrates 7-day NOAA weather forecasts with ERCOT demand modeling to provide advance warning of high-risk temperature events. When forecasts show temperatures above 95°F for the next 3-5 days, the platform elevates monitoring priority and alert thresholds — giving operations teams advance notice rather than reactive awareness.