Conditions on the grid becoming more strained as heat wave intensifies
Even greater reductions in energy use needed to maintain reliability
September 6, 2022 - FOLSOM, Calif. – Record-breaking temperatures are leading to historic high forecasted demands for power, putting even greater strain on the California Independent System Operator (ISO) electrical grid and significantly increasing the likelihood of rotating outages unless consumers can reduce their energy use even more than they have so far.“This is an extraordinary heat event we are experiencing, and the efforts by consumers to lean in and reduce their energy use after 4 p.m. are absolutely essential,” said Elliot Mainzer, the California Independent System Operator’s president and CEO. “Over the last several days we have seen a positive impact on lowering demand because of everyone’s help, but now we need a reduction in energy use that is two or three times greater than what we’ve seen so far as this historic heat wave continues to intensify.”
The ISO declared an Energy Emergency Alert 1 (EEA) on Monday morning. That emergency designation signals to utilities and consumers that all resources are committed or forecasted to be in use, and that energy deficiencies are expected. A Flex Alert urging consumers to reduce their power use in the late afternoon and evening is in effect for Tuesday, marking seven consecutive days the call to cut demand has been issued.
As they monitor a host of factors including wildfires and generator availability, grid operators will determine later today if the emergency notifications need to be elevated to an EEA 2 or beyond.
EEA 2 would trigger deployment of a suite of emergency tools designed to keep supply and demand for the power system balanced during extreme conditions, and potentially freeing up to a few thousand megawatts of additional resources.
If conditions continue to deteriorate, an EEA 3 may be declared. If reserves are then exhausted the ISO would instruct utilities in its service area to manage shedding load.
Utilities make the determination of how best to spread and rotate the outages across their service territory, with the goal of keeping them as short as possible. For two days in August 2020, outages affecting about 800,000 homes and businesses lasted anywhere from 15 minutes to about 2½ hours, marking the first time outages were ordered in California due to insufficient supplies in nearly 20 years.
“We never want to get to that point, of course,” Mainzer said, “but we want everyone to be prepared and understand what is at stake. We can’t control the weather, but we really can bend the demand curve and get through this successfully if everyone doubles down and reduces their energy use as much as possible.”
For more information, see our Rotating Power Outages fact sheet.
Forecasted loads are currently very high, with Tuesday showing peak demand at 51,145 megawatts (MW), which would set a new record from the previous high of 50,270 MW in 2006. Wednesday’s load is forecast at 50,002 MW. For context, see our Peak Load History report.
The ISO is projecting supply deficiencies of 400 to 3,400 MW between the hours of 5 p.m. and 9 p.m. today.
Consumer and commercial demand response, including Flex Alerts, has been helping to extend tight resources over the past week, with a load reduction of around 1,000 MW for each of the past several days, with more now needed as the heat continues to increase.
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.
Learn more about conserving energy or sign up for text notifications at www.FlexAlert.org.
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: Washer and dryer, Dishwasher, 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
Source: CA. ISO
