With a modern heat pump, it is more efficient (most of the time) to burn natural gas at the power plant and then use the generated electricity to heat the home

With a modern heat pump, it is more efficient (most of the time) to burn natural gas at the power plant and then use the generated electricity to heat the home (after accounting for generation and line losses, and other efficiency drains) than it is to burn the gas in a modern, super-efficient gas furnace in the home. So whether we fully renewablize™ the grid or not, we still should encourage (read: subsidize) the replacement of gas and heating oil furnaces with heat pumps.