The eia article The United States set record for daily natural gas power burn in late July by David Manowitz (8/26/2020) explains:
In the United States, natural gas consumed by electric power plants (power burn) set a daily record high of 47.2 billion cubic feet (Bcf) on Monday, July 27, according to S&P Global Platts estimates. Consequently, on the same day, natural gas-fired generation in the Lower 48 states also reached an all-time high of 316 gigawatts (GW) in the late afternoon, according to the U.S. Energy Information Administration’s (EIA) Hourly Electric Grid Monitor.
Before July 27, 2020, the record for U.S. natural gas power burn to generate electricity stood at 45.4 Bcf, and it was set on August 6, 2019. Natural gas power burn exceeded 45.4 Bcf per day on seven days in July 2020 and one day in August.
What else was used to generate electricity on July 27?
Of the electricity generated on July 27 in the Lower 48 states, natural gas held the largest share at 45%, followed by coal with a 24% share. Remaining shares included nuclear at 17%, renewable energy at 12%, and other sources at 3%.
There is other information, another graph, and links to data sources (check out the Hourly Electric Grid Monitor).