The Connecticut Valley Electric Exchange (CONVEX) operates the electric transmission system in Connecticut and western Massachusetts, serving more than 1.7 million people. CONVEX provides safe and reliable electricity to help boost the economy and quality of life for this thriving region's residential and business customers.

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* Please note that all data is preliminary and is subject to change.

New England Load Graph

Connecticut Load Graph

CONVEX Load Graph


  • Rolling Blackouts
    Temporary interruption of electrical service. ISO New England would implement rolling blackouts only if and when New England's electrical system is unable to meet heavy peak demands because of an extreme deficiency in the power supply. By temporarily disconnecting electrical circuits on a rotating basis, a majority of customers have power, inconvenience is minimized and a more serious widespread problem is averted. Each rotation is of a specific duration, usually no longer than a few hours, but it could take longer in some locations due to the manual nature of the operation.
  • Power Warning
    Public appeals when an immediate reduction in power usage is necessary to avert overload of the electrical system. Public appeals are made when other efforts (e.g. emergency purchases, voluntary curtailment, contracted curtailment and voltage reduction) have been unsuccessful in bringing supply and demand back into balance.
  • Conservation Day
    Public appeal to customers to conserve electricity in anticipation of heavy electrical demand and unhealthy air quality conditions, usually due to humid weather.

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  • Q: What would happen if not enough people pay attention to the appeal to reduce consumption?

    If an extreme situation was to persist and public appeals were unsuccessful, it could be necessary to disconnect some customers. If load is extraordinarily high or generating units are off line, the system would automatically disconnect customers to avoid system instability, widespread blackouts and system damage. Depending on where problems occur, different areas would be disconnected.

    During such an emergency, utilities might not be able to keep power on at essential facilities such as hospitals, sewage treatment plants, airports and specific sections of large cities with networked circuits. The utilities would restore power to these essential facilities as quickly as possible, if necessary by disconnecting other areas as part of controlled rolling blackouts.

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