Contrary to what most utilities and DPU folks would have us believe, solar is healthy for the grid. Please see this piece from NREL which has done a study with First Solar in the California ISO market. Bottom line is that solar helps with voltage, frequency, and ramping capacity.
The data from the test show how with advanced power controls a photovoltaic plant can morph from being simply an intermittent energy resource to one also providing grid services ranging from spinning reserves, load following, voltage support, ramping, frequency response, variability smoothing and frequency regulation to power quality, the report said.
Advanced design makes grid more resilient with solar and smart inverter technology.