Sign up for our daily briefing

Make your busy days simpler with Axios AM/PM. Catch up on what's new and why it matters in just 5 minutes.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Catch up on the day's biggest business stories

Subscribe to Axios Closer for insights into the day’s business news and trends and why they matter

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Stay on top of the latest market trends

Subscribe to Axios Markets for the latest market trends and economic insights. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Sports news worthy of your time

Binge on the stats and stories that drive the sports world with Axios Sports. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Tech news worthy of your time

Get our smart take on technology from the Valley and D.C. with Axios Login. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Get the inside stories

Get an insider's guide to the new White House with Axios Sneak Peek. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Catch up on coronavirus stories and special reports, curated by Mike Allen everyday

Catch up on coronavirus stories and special reports, curated by Mike Allen everyday

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Denver news?

Get a daily digest of the most important stories affecting your hometown with Axios Denver

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Des Moines news?

Get a daily digest of the most important stories affecting your hometown with Axios Des Moines

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Twin Cities news?

Get a daily digest of the most important stories affecting your hometown with Axios Twin Cities

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Tampa Bay news?

Get a daily digest of the most important stories affecting your hometown with Axios Tampa Bay

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Charlotte news?

Get a daily digest of the most important stories affecting your hometown with Axios Charlotte

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Transformers at an electrical substation in Houston. Photo: George Rose/Getty Images

Demand for air conditioning across Texas helped drive wholesale electricity prices to the market cap of $9,000/MWh earlier this week, testing both the grid's capacity and the public's response to price spikes under the state's wholesale electricity market.

The big picture: ERCOT, the grid operator for most of Texas, operates an “energy-only” market that pays power plants only when they produce energy, and not merely for being available to do so. Many ERCOT plants thus rely on high-priced scarcity events to stay profitable in the otherwise low-cost grid, where prices are kept down by cheap natural gas prices and, to a lesser extent, renewables.

How it works: ERCOT boosts the wholesale market price when reserves are low, sending a market message that capacity is valuable. But this process has been criticized for not providing enough scarcity pricing to drive new investment across the electricity system.

  • The Public Utilities Commission of Texas responded this summer by accelerating the rate of price increases during high demand. Undesirable as they may appear, these high seasonal prices are a crucial part of how energy-only electricity markets work.

Flashback: ERCOT has seen this situation before. For the past two summers, its grid has had a lower reserve margin (power plant capacity beyond projected peak demand) than is considered economically optimal (8.6% this year vs. 10.25% optimal).

Where it stands: The grid has so far survived summer with no real damage, and the weather forecast promises near-term relief.

  • Some emergency response services were deployed, but there was still plenty of room in the system to maneuver.
  • Demand response has played an increasingly important role in the market: When prices spiked, demand dropped, helping the system keep lights on and air conditioners humming.

What they're saying: Some groups have tried to attribute higher prices to changes in Texas' electricity mix — including greater reliance on wind power, which this year could surpass coal in the #2 energy generation spot, behind natural gas.

  • Yes, but: Low natural gas prices have a bigger effect than renewables. And over the course of the year, a few high-priced days provide needed revenues in an otherwise efficient market.

The bottom line: Texas' energy-only market is still a relatively new concept. Some refinements may be needed, but the recent high electricity prices are a feature of the system, not a bug.

Joshua Rhodes is a senior energy system modeler and analyst at Vibrant Clean Energy and a research associate in the Webber Energy Group and the Energy Institute at the University of Texas at Austin, where he has served as the principal investigator of an ERCOT–sponsored research project.

Go deeper

1 hour ago - Health

CDC panel endorses Pfizer vaccine for 12- to 15-year-olds

Illustration: Brendan Lynch/Axios

An advisory panel for the Centers for Disease Control and Prevention on Wednesday endorsed the Pfizer-BioNTech coronavirus vaccine for 12-to 15-year-olds, following the FDA's emergency use authorization.

Why it matters: Approval from the CDC panel was the final step needed before inoculations could be offered at any vaccination site for this age group.

  • Pfizer has said its vaccine is 100% effective at protecting against COVID-19 in a trial of more than 2,200 children between the ages of 12 and 15.

GOP lawmakers downplay Capitol riot at House hearing

Photo: Jon Cherry via Getty Images

Republican members of Congress sought to minimize the Capitol insurrection at a House hearing on Wednesday, with statements calling pro-Trump rioters "patriots" and other lawmakers falsely denying demonstrators were supporters of the former president at all.

Driving the news: The hearing comes shortly after House Republicans voted to oust Rep. Liz Cheney (R-Wyo.) from leadership over her criticism of former President Trump's actions leading up to and on Jan. 6.

McConnell, McCarthy say 2017 tax law is "red line" in infrastructure talks

The top Republicans in the House and Senate told reporters after meeting with President Biden at the White House that "there is a bipartisan desire to get an outcome" on an infrastructure package, but stressed that revisiting the 2017 tax cuts is a "red line."

Why it matters: Wednesday marked the first time that Biden has hosted Senate Minority Leader Mitch McConnell (R-Ky.) and House Minority Leader Kevin McCarthy (R-Calif.) at the White House.