Renewable energy

As wind and solar energy grow, so do their challenges

Data: WoodMac; Chart: Axios Visuals

Costs for wind and solar electricity have plummeted in the U.S. and around the world, driving incredible growth in these cleaner sources of energy and helping combat climate change.

But, but, but: The costs associated with the variability of wind and solar — it’s not always windy or sunny — are growing as states, progressive politicians and corporations push for rapid increases in these resources to levels much greater than what we have today.

Expert Voices

Summer price spikes are a feature of Texas' power market, not a bug

electric transformers next to an office building
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.