This line of reasoning makes no sense to me. If the government was better at building things than "profiteers," why shouldn't we just have the government build everything? Why shouldn't the government make cell phones and iPads? Why does Silicon Valley even exist?
In fact, we tried your proposal at scale. Nearly every developed country privatized electricity generation in the 1980s. Many countries, like India, still have state-owned power companies. If they were better, we would know.
Germany was at 40% renewables last year, and its electric generation sector is private. The UK—which privatized its electric generation under Thatcher back in the 1980s—was at 43%. China was at 29%.
In fact, we tried your proposal at scale. Nearly every developed country privatized electricity generation in the 1980s. Many countries, like India, still have state-owned power companies. If they were better, we would know.