Ok, this is what the rules say:

By contrast, general measures are not regarded as State aid because they are not selective and apply to all companies regardless of their size, location or sector

So... offer all companies, no matter what size or sector or owner, the option of taking part in a massively diluting rigths issue, where the government injects, say 10 % of current equity in the company, and in return gets new shares equal to 1000% of the current number of shares. This would be equal and open to all, but no company would ever except the "offer", except one that is already 100% state-owned.

In this way you could issue sovereign bonds and transfer the cash into state-owned power companies while avoiding the illegal state aid rules.

Peak oil is not an energy crisis. It is a liquid fuel crisis.