Folsom, CA…The California Independent System Operator (ISO) has issued a statewide Flex Alert, a call for voluntary electricity conservation, for today, Aug. 31 from 4 p.m. to 9 p.m., due to high temperatures pushing up energy demand and tightening available power supplies. With excessive heat in the forecast across much of the state and Western U.S., the grid operator is expecting high electricity demand, primarily from air conditioning use, and is calling for voluntary conservation steps to help balance supply and demand. Additional Flex Alerts are also possible through the Labor Day weekend as record-setting temperatures are forecast across much of the West.

In what’s likely to be the most extensive heat wave so far in the West this year, temperatures in Northern California are expected to be 10-20 degrees warmer than normal through Tuesday, Sept. 6. In Southern California, temperatures are expected to be 10-18 degrees warmer than normal. Death Valley is currently forecast to peak at 126 degrees on Saturday, which would tie the highest temperature ever recorded on Earth in the month of September.

Today’s Flex Alert is scheduled between 4 p.m. and 9 p.m., when the grid is most stressed from higher demand and less solar energy. During that time, consumers are urged to conserve power by setting thermostats to 78 degrees or higher, if health permits, avoiding use of major applicances and turning off unnecessary lights. They should also avoid charging electric vehicles while the Flex Alert is in effect.

To minimize discomfort and help with grid stability, consumers are also encouraged to pre-cool their homes and use major appliances and charge electric vehicles and electronic devices before 4 p.m., when conservation begins to become most critical.

Reducing energy use during a Flex Alert can help stabilize the power grid during tight supply conditions and prevent further emergency measures, including rotating power outages.

Flex Alert Conservation Actions
Before 4 p.m.:
 Pre-cool home by setting the thermostat to as low as 72 degrees
 Use major appliances, including:
o Washer and dryer
o Dishwasher
o Oven and stove for pre-cooking and preparing meals
 Charge electric vehicles
 Adjust blinds and drapes to cover windows
From 4 p.m. to 9 p.m.:
 Set thermostat to 78 degrees or higher, if health permits
 Avoid using major appliances and charging electric vehicles
 Turn off all unnecessary lights

About Flex Alerts
A Flex Alert is issued by the ISO when the electricity grid is under stress because of generation or transmission outages, or from persistent hot temperatures.

View the fact sheet on Emergency Notifications on our News webpage.
Follow grid conditions in real time at ISO’s Today’s Outlook, download the free ISO Today mobile app, and follow us on Twitter at @California_ISO.

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California ISO | 250 Outcropping Way | Folsom, CA 95630 | www.caiso.com
The California Independent System Operator (ISO) is a nonprofit public benefit corporation dedicated, with its partners, to continuous improvement and secure operation of a reliable grid operated for the benefit of consumers. It provides comprehensive grid planning, open and nondiscriminatory access to one of the largest networks of high-voltage transmission power lines in the world, and operates a $9 billion competitive electricity market. Recognizing the importance of the global climate challenge, the ISO is at the forefront of integrating renewable power and advanced technologies that will help provide a sustainable energy future efficiently and cleanly.
The Western Energy Imbalance Market (WEIM) is a real-time wholesale energy trading market that enables participants anywhere in the West to buy and sell energy when needed. The WEIM Governing Body is the governing
authority designed by regional stakeholders and has shared authority with the ISO Board of Governors to resolve rules specific to participation in the WEIM.