You can always sell it at the current price, but with further environmental commitments by country the price of operating or closing a plant will probably only

You can always sell it at the current price, but with further environmental commitments by country the price of operating or closing a plant will probably only go up. But due to the hypothetical nature of those new environmental regulations they are probably not considered during the buyout process. But the current trend would point towards their cost only going up, and no regulation making fossil fuel plants any cheaper to run or decomission.