The separately maintained grid is the exact reason for why it's terrible. There was a winter storm that knocked out power for 4 million people in February 2011, and then again earlier this year in February and around 500 people died. People were boiling snow for water. They didn't fix the problem for 10 years and it happened again. A 2019 study showed that Texas is the only region of the US with insufficient power reserves to meet peak demands during summer months. With climate change accelerating I can only imagine the problem getting worse.