https://www.scientificamerican.com/article/after-blackout-questions-emerge-on-future-greening-of-texass-grid/ > Texas’ electric grid buzzes with contradiction. It is simultaneously the dirtiest power system in the country and the leading generator of renewable power. > The dueling superlatives reflect changes sweeping across the Texas prairie. The use of coal has been cut in half over the last decade, to 18% of generation, while wind surged to provide about a quarter of the state’s power.