January 1, 2025 divides two very different positions
Customers installing solar from January 1, 2025 earn 9.3 cents per kWh for excess solar credits under the Mon Power and Potomac Edison arrangement.
Customers who signed up before December 31, 2024 were grandfathered into the previous, more favourable rates for 25 years.
Twenty-five years is close to the full working life of a residential solar system, so for those customers the change is largely academic. They keep what they signed up for.
That makes the sign-up date the single most valuable fact about any existing array in Mon Power or Potomac Edison territory, and it is not visible from the roof.
Designing at 9.3 cents for excess
At 9.3 cents per kWh for excess generation, exported electricity is worth meaningfully less than electricity you consume as it is generated, which offsets a purchase at the full retail rate.
That gap is smaller than in avoided-cost states but large enough to shape the design. Self-consumption is now clearly the more valuable outcome.
Ask what self-consumption share the savings model assumed, and ask for the savings split into avoided purchases at retail and excess generation at 9.3 cents.
Ask for a smaller system modelled alongside the proposal, since the marginal panels produce disproportionately more excess than the first ones do.
And rising retail rates on the other side
The Public Service Commission approved a double-digit residential rate increase for Mon Power and Potomac Edison customers. That raises the value of every kilowatt hour you consume yourself.
It does not raise the 9.3 cent excess rate, so rising retail rates widen the gap between self-consumption and export rather than lifting both.
That reinforces the design conclusion: weight the system toward what your household actually uses during daylight, and treat excess as a modest bonus.
Ask what escalation the projection assumed on the retail side and whether it assumed anything on the excess rate. Those should be handled separately because they move independently.
Building the number from the meter and the credit
The 30 percent federal Residential Clean Energy Credit under Section 25D expired for property placed in service after December 31, 2025, so a cash or loan purchase in Morgantown receives no federal tax credit, and West Virginia has no state solar tax credit.
Section 48E survives at 30 percent for third-party owners under leases and power purchase agreements, so ask what a provider claims and what reaches you in the rate.
What exists is retail value for self-consumed generation and 9.3 cents per kWh for excess under the Mon Power and Potomac Edison arrangement for systems from January 1, 2025.
Ask for those separated in the projection with the self-consumption share stated, and confirm your tier with the utility if you already have a system.