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Maguire: Texas and California extend their clean energy lead over the rest of US

Texas and California have driven U.S. clean electricity supplies to record-high levels so far in 2025. They are also building a wider lead over the remainder of the country when it comes to the share of power generated by clean energy sources.

LSEG data shows that the combined clean power output of the main power systems from California and Texas reached new highs from January to August, and increased by 10% compared to the same months in the year 2024.

The clean output growth in California and Texas was nearly two times as high as the total electricity generation elsewhere.

Texas and California are also leading the U.S. for new installations of combined solar and battery storage capacities so far in 2025. This will likely lead to a further concentration of clean energy growth in these states.

Other states could now fall further behind Texas in terms of clean energy and total power generation.

It could lead to a lopsided growth in national electricity, as states with large clean capacity footprints will outpace states who have adopted clean generation capacity more slowly over the past few years.

FORGING Ahead

According to LSEG, data shows that from January to August, 74% of wholesale electricity generated by the California Independent System Operator - CAISO came from clean sources.

This was the highest share of clean generation ever recorded for California. It compares with a 68% share in the same months a year ago and a 60% percentage for the same period in 2023.

Electric Reliability Council of Texas, which covers the majority of Texas, generated 46.5% of their power from clean sources between January and August. This was a record-breaking share, up from 43% in 2013 and 41% in 2023.

LSEG data show that the total volume of clean energy generated by CAISO from January to August 2024 increased by 4%, to a new record of 3.8 million Megawatt Hours (MWh).

ERCOT generated 6.4 million MWh between January and August, which is 14% higher than the same period the previous year. It's also a record high.

This combined total of clean generation from these two states reached 10.2 million MWh. This represents a 10% increase from the previous year.

The rest of the U.S. generated clean power at a rate of 39.9 millions MWh from January to August, which is also a record. However, this was only a 2.6% rise compared to the same months in 2020.

Shares Expanding

California and Texas have expanded their clean energy generation faster than the rest the country. Their combined share of national clean electricity generation has reached a new record of 20,4% in 2025.

This share is compared to 19.3% from January to August 2024 and a 19% during January to July 2023.

Clean power supply in CAISO & ERCOT has grown at a rapid pace. In January to August of this year, clean power accounted for 54% of total combined power generation. Fossil fuels made up 46%.

LSEG data show that the remaining U.S. power generation system is composed of a mix of 39% fossil fuel and 61% clean energy. CAISO and the ERCOT systems also accounted for a large portion of the U.S. new solar and battery storage capacities over the last year. According to the data portal Cleanview, 36% of the new solar capacity and 66% new battery capacity was built.

These additions place CAISO/ERCOT in a position of strength to continue outperforming other states in harnessing and deploying new clean energy, even as power operators from other states struggle with reduced federal funding for clean energy.

This means that Texas and California are more likely to be able to keep up with national power demand growth than other states, and this could result in a divergence of power market dynamics among ERCOT and CAISO.

These are the opinions of a columnist who writes for.

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(source: Reuters)