Eversource Question... Not a Rant

What makes Eversource in MA so different from Eversource in CT? I am talking strictly electricity, not other services. Are all of the pricing/policy differences strictly due to state regulators, or is the "electricity business" fundamentally different in the 2 states?

2 things personally that would be much friendlier to my bills if I were in MA: 1. Heat Pump rate 2. Rebate for EV charger install I am trying to be "green". I can't quite make the case for myself for solar. In MA, they still have net metering, but that has been done away with in CT as well. Is this all just PURA?