[jqpabc123]

Like a lot of things in life, this boils down to a political problem.

Change the laws in your area so the electrical utility/grid operator is required to buy it from you at prevailing rates.

This is the case in many (if not most) areas of the USA. Excess power simply feeds back in the electrical grid. The electrical meter works both ways so power feeding back into the grid runs your meter backwards. If this reduces your bill to less than zero, the utility will send you a check for the amount due.