Louisiana utility companies still want to charge customers for the costs of a new energy efficiency program and for the electricity no longer needed due to that program.
The article is rather one-sided but this isn't actually as silly as it sounds. Utility company expenses don't go down to zero if people stop using electricity because power plants and electrical grids cost a lot of money just by existing. It's also possible that these efficiency improvements don't actually decrease peak loads much in which case utility companies might not even be able to shut down power plants. I think it's common for utility companies to add a constant fee just for being hooked up to the grid to cover such costs (for example, that's what California is doing) and because these companies are so heavily regulated, they need government permission to do that.
I don't think that's self-evident. In practice private companies can often be a lot more efficient than the government, but there's a more fundamental objection too: taxpayers can choose to invest the money they save from paying lower taxes into the private utility company and by doing so they get the same amount of "free money" that they would have saved by paying more taxes upfront for a government-owned utility. In other words, if owning a utility company is so great, you can do it yourself via the free market rather than via the government.
In Ontario, Canada if companies or individuals participate in energy savings programs where rebates are funded by the government then they increase rates to accommodate the list revenue from the savings of those programs. If you participate you still get a savings since when the rates go up you won't go up as much and if you don't then your at a loss since rates going up from other people participating will impact that.