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@feld@bikeshed.party tbh it is a problem, if the energy price goes negative, that means nobody wants it, and you essentially just have to shut down your solar panels if you didn't manage to sell all of your energy, and your investment on the panels has no returns.

And usually it still costs something to consumers, since transmission prices don't go down during that time, and actually even might go up as transmission network might get maxed out on power, and consumers can start competing for electricity.

Now, the solution to the problem is building more balancing infrastructure, and close to the solar panels if possible, but that's either expensive battery farms, or very location dependent pumped storage plants. Moving more consumers to dynamic (by hour) plans to make them more aware of energy pricing and as such trying to move/create demand to try to better match the supply can help as well.