The oldest maxim in politics is “follow the money.” That maxim also applies to electric grids. Following the billions of dollars that have been spent on the Texas grid explains why the state continues to have electricity shortages. On Monday, ERCOT, the state’s troubled grid operator, asked Texans to reduce their electricity use. That request came exactly four months after Texas residents were asked to conserve electricity due to a massive winter storm. Before going further, I’ll give you the punchline: As I explained in these pages in April, about $66 billion was spent on wind and solar in Texas...