06.29.2026 NYISO Prepares for Heat Dome and Increased Demand on the High Voltage Electric System
Rensselaer, NY – A large heat dome will bring extreme temperatures to New York this week and drive up consumer demand on the electric system. When temperatures and humidity spike, increased demand for air conditioning can strain generation and transmission resources.
During extreme heat advisories and potential energy shortages, the New York Independent System Operator (NYISO) actively manages the power grid through a tiered alert system and various grid-reliability measures. The NYISO’s System Conditions page can be viewed at www.nyiso.com/system-conditions.
The NYISO may issue grid alerts if energy reserve margins drop below specified levels. These alerts are designed to raise awareness about grid conditions and inform the public if electricity conservation is necessary.