system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how do you sell electricity back to the power company?
gpt
People with energy generation systems actually use a transformer to add their electricity to the public grid, and a meter counts how much they add. Power companies appreciate this as they can get a discount from their own energy generation, have a positive image (most home energy sellers are very eco friendly), and have a more distributed grid that is more resilient to power outages/problems. Also, some governments force energy companies to buy the energy in order to be more 'green.'