NAPA, Calif. (KRON) – With excessive heat comes the possibility of power outages — On Thursday night, PG&E warned more than 120,000 customers that rotating blackouts might be needed to balance the supply and demand.

Fortunately, California ISO ultimately did not implement those outages because people conserved enough energy but the initial warning still had people fearing they’d be left in the dark with no fans or air conditioning.

In a tweet, officials said PG&E has informed the city that the California Independent System Operator (Cal ISO) had issued a notice that outages may happen Thursday if the demand for electricity exceeds supply.

“PG&E may be required to turn off your power for 1 to 2 hours in a series of rotating block outages. These outages are not Public Safety Power Shutoffs, which are used to help prevent a wildfire, or for equipment maintenance. The decision to conduct these outages will be made by the grid operator, CAISO. PG&E strongly encourages customers to conserve energy to eliminate the need for rotating outages. However, all customers should prepare for a potential outage,” the city tweeted.

This possibility of losing power is becoming the norm here in wine country.

Cities like Napa are being warned during these extreme heat waves that their residents may lose power because the demand of electricity mostly from air conditioners can be too much for the overall grid.

Too much energy use because of sweltering temperatures may cause your electricity to go out.

The state’s electric grid operator, also known as the California ISO warns if the demand for electricity exceeds the available supply, a brief outage may be required.

These warnings keep residents of Napa on their toes.

Unlike the public safety power shut offs which are done during high fire threat situations, rotating outages happen in only specific blocks to prevent larger sections of the power grid from going dark.

Lately, these potential threats have become a normal part of life for people in wine country.

For more information, visit PG&E’s website.

At last check, current demand for electricity according to Cal ISO was at 41,296 MW; available capacity is 52,176 MW.