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 - Podcasts

The child care tax on America's economy

Child care in the U.S. is in crisis, which makes it much harder for the American economy to recover — as providers struggle to stay in business and parents wrestle with work.

Axios Re:Cap digs into the problems and what can be done to solve them, with Vox senior reporter Anna North.

Viral load is a puzzle in COVID-19

Illustration: Eniola Odetunde/Axios

How sick a person gets from a virus can depend on how much of the pathogen that person was exposed to and how much virus is replicating in their body — questions that are still open for the novel coronavirus.

Why it matters: As people try to balance resuming parts of their daily lives with controlling their risk of COVID-19, understanding the role of viral load could help tailor public health measures and patient care.

Updated 2 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 4 p.m. EST: 32,048,333 — Total deaths: 979,454 — Total recoveries: 22,025,324Map.
  2. U.S.: Total confirmed cases as of 4 p.m EST: 6,962,333 — Total deaths: 202,467 — Total recoveries: 2,670,256 — Total tests: 97,459,742Map.
  3. Health: Cases are surging again in 22 states — New York will conduct its own review of coronavirus vaccine.
  4. Business: America is closing out its strongest quarter of economic growth.
  5. Technology: 2020 tech solutions may be sapping our resolve to beat the pandemic.
  6. Sports: Here's what college basketball will look like this season.

Get Axios AM in your inbox

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

Please enter a valid email.

Subscription failed
Thank you for subscribing!