When the feed-in tariff is higher than the levelized generation costs of a (renewable) generation asset and the transformer station to the electrical grid is being optimized, the optimization problem can not be solved as the optimal solution would require an infinitive capacity/feed-in.
We need to cap this feed-in (eg. x times of total demand p.a.), to allow the solver to run-through. An message should then be displayed to the user, saying
"Please check the feed-in tariff and component costs. If both are correct, it might be a business plan to place a grid-feeding power plant inside your local electricity system."