West News Wire: As the country prepares for the peak of hurricane season and the summer heat, US power companies are dealing with supply shortages that could affect their ability to keep the lights on.

The United States is experiencing an increase in the frequency of extreme weather phenomena like storms, wildfires, and drought. This summer, consumer power use is anticipated to reach all-time highs, which could put a strain on the nation’s electric grids at a time when government agencies are warning that the weather may affect grid reliability.

Utility companies have issued a warning about equipment supply shortages, which could make it more difficult to restore power during outages. Additionally, they are finding it more difficult to restock natural gas reserves for the upcoming winter as power generators burn record levels of gas as a result of the closure of numerous coal plants in recent years and extreme drought cuts hydropower supplies in many Western states.

“Increasingly frequent cold snaps, heat waves, drought and major storms continue to challenge the ability of our nation’s electric infrastructure to deliver reliable affordable energy to consumers,” Richard Glick, chairman of the US Federal Energy Regulatory Commission (FERC), said earlier this month.

Federal agencies responsible for power reliability like FERC have warned that grids in the western half of the country could face reliability issues this summer as consumers crank up air conditioners to escape the heat.

Some utilities have already experienced problems due to the heat. Texas’ grid operator, the Electric Reliability Council of Texas (ERCOT), was forced to urge customers to conserve energy after several plants shut unexpectedly during an early heat wave in mid-May.

In mid-June, Ohio-based American Electric Power Co (AEP.O) imposed rolling outages during a heat wave after a storm damaged transmission lines and knocked out power to over 200,000 homes and businesses.

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The US Midwest faces the most severe risk because demand is rising while nuclear and coal power supplies have declined.

The Midcontinent Independent System Operator (MISO), which operates the grid from Minnesota to Louisiana, warned that parts of its coverage area are at increased risk of temporary outages to preserve the integrity of the grid.

Supply-chain issues have already delayed the construction of renewable energy projects across the country. Those renewable delays coupled with tight power in the Midwest prompted Wisconsin’s WEC Energy Group Inc (WEC.N) and Indiana’s NiSource Inc (NI.N) to delay planned coal plant shutdowns in recent months.

Utility operators are conserving their inventory of parts and equipment as they plan for severe storms. Over the last several months, that means operators have been getting creative.

“We’re doing a lot more splicing, putting cables together, instead of laying new cable because we’re trying to maintain our new cable for inventory when we need it,” Nick Akins, chief executive of AEP, said at the CERAWeek energy conference in March.

Transformers, which often sit on top of electrical poles and convert high-voltage energy to the power used in homes, are in short supply.

New Jersey-based Public Service Enterprise Group Inc (PSEG) (PEG.N) Chief Executive Ralph Izzo told Reuters the company has had to look at alternate supply options for low voltage transformers.

“You don’t want to deplete your inventory because you don’t know when that storm is coming, but you know it’s coming,” Izzo said.

Summer is just starting, but U.S. weather so far this year has already been about 21% warmer than the 30-year norm, according to data provider Refinitiv.

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