That is one of the beauties of these. The other is that the electric tariffs are customized for each renewable energy technology, as well as their location sometimes (different PV rates for deserts and temperate climate areas based on average insolation of regions).

Depending on how it is implemented there could be some adverse effects. Assuming transmission capacity is sufficient and PV supply capability fixed, we would want PV to be installed only in the highest insolation sites. Giving a greater incentive for someone in a cloudy location decreases the net power produced. Of course if the objective is to incubate a nascent industry which is expected to grow exponentially, then supporting the fastest possible growth rate for that industry should take precedence.