[greenmartian]

There are some interesting points there.

1. (For those on the state-owned retailer/distributor) Although you can't be credited for any generation over 100% (up from 65%), the extra credit does carry over in a 6-monthly cycle (up from 3). Which means, while you can't make a profit out of your generation, it does cater for seasonal variations to keep your bill at zero. Not the best, but not terrible.

2. (For private retailers) As you said, there's nothing requiring them to do anything.

Also of interest is that, even with deregulation efforts in the early 2000s, the state still holds near-monopoly level of distribution/retail - especially in the residential market. The small number of private operators are either remote, or focused on industrial complexes.

On the generation side, there's plenty of major private players, but most of them simply sell to the state (again, because of the near-monopoly).