PEC never paid greater than market rates, they simply gave a net credit since solar was only reducing load at the service drop for a neighborhood. The cost to them was swapping the meter for a bidirectional one. Now at some point if enough people started using solar, they have the option of either curtailment (which would be automatically reflected in the existing meters), which at that point would justify an increase in fees, but their study was specific that they lowered solar compensation due to being able to sell less power to solar users (not for infrastructure reasons), which makes no sense why they are singling out solar since they offer incentives for other efficiency measures such as more efficient AC units to lower power consumption.