If grids are very conservative, that would also seem to suggest that grid operators would want existing solar farms topped up rather than replaced - old debugge

If grids are very conservative, that would also seem to suggest that grid operators would want existing solar farms topped up rather than replaced - old debugged solar farms declining, to be replaced by excitingly untested new ones, seems like an unnecessary risk? Compared to if one could just instead just slot in the new solar panels one by one, gradually, incrementally, into old trusty solar farms...