SAN ANTONIO – Top officials of the Electric Reliability Council of Texas, the agency that regulates the state’s electric grid, said Friday that no energy source was safe from the massive winter storm this week. AdThat choice kept the state’s electric grid from a possible catastrophic blackout, ERCOT officials previously said. (KSAT)The deadly storm has reignited arguments about the state’s energy plan, including whether it over invested in renewable energy sources. Still, wind energy accounts for less than a quarter of the state’s electricity, a figure that is lower in winter months, ERCOT officials said. AdThat supply, according to ERCOT officials, would have been just as vulnerable to the elements.