How much can you sell electricity back to the grid for?

Excuse me, could you please elaborate on the process of selling electricity back to the grid and how much one might potentially earn from it? I'm interested in understanding the specifics, such as the rate per kilowatt-hour that utilities typically pay for renewable energy fed back into the grid, as well as any potential incentives or subsidies that may be in place to encourage such practices. Is there a standard or average figure that can be expected, or does it vary greatly depending on location and the type of renewable energy source being utilized?