I'm not arguing wind/solar in some areas at some point won't become more cost efficient than the status-quo of staying on the grid. Innovation leads to better and cheaper market choices.
If 'alternatives' ever live up to the political hype, people will buy them. It is that simple. The reason they are talking mandates is because people aren't buying their 'green' snakeoil.
All government mandates and subsidies end up doing is driving up the price of energy for consumers. That's the lesson of Germany, Canada, UK, Greece etc. - the futility of government "climate change" policies.
"Green energy" = Obamacare on steroids