Renewable energy is great
Having a power grid is great, needs money to maintain
Having on demand power generation is great, needs money to maintain.
The current model pays for the maintenance and carrying costs of the grid and always available power generation with usage.
The current model doesn't work when electricity has a negative cost. So we would lose either the on demand power generation or access to the grid.
It's not capitalism that's the problem, just the current pricing model.