Upstate New York customers have set a new record for electricity demand hitting a usage of 6,911 megawatts on Friday, says National Grid.
The previous record was 6,901 megawatts set on July 21, 2011.
National Grid says average use ranges between 5,500 - 6,000 megawatts.
National is asking customers to cut back on all unnecessary electricity use during daytime hours to conserve energy.
The utility says its electricity supply is sufficient, but fears the combination of heavy demands to keep cool and high temperatures could potentially challenge the regional network.
Gov. Andrew Cuomo is also urging people to cut back as much as possible to take pressure off the state's power grid and help prevent outages or brownouts.