No annual forfeit is a real advantage
Many states reset solar credits annually and forfeit whatever is unused. Washington grants unused credit to the utility on April 30, Oregon donates it at the end of the March billing cycle, and Colorado defaults customers to a year-end payout at a low rate.
Under the PNM arrangement for systems of 10 kW AC or less, excess generation accumulates as kilowatt hour credits applied to future bills, and those credits do not expire while the account remains open.
That means a summer surplus genuinely carries into winter rather than being wiped at a settlement date. It is one of the better net metering arrangements left in the country.
It also means the usual warning against any annual surplus does not apply here with the same force. The design conversation shifts from avoiding a forfeit to sizing sensibly for cost.
What still limits sensible size
The 10 kW AC threshold does. Above it, the arrangement changes to monthly payment for excess at the utility approved purchase rate, which is below retail, so a design just above the line should be examined closely.
The state credit does. It is capped at $6,000 per taxpayer per taxable year, so the 10 percent credit stops growing on system cost above roughly $60,000, which no ordinary residential system reaches, but the cap is still the ceiling on that line.
And capital does. Capacity you never consume represents money spent producing electricity that sits as credit rather than reducing a bill, even where the credit does not expire.
So build from your last twelve months of bills, ask what percentage of annual usage the design covers, and ask for the AC rating stated explicitly so the threshold question is settled.
The estimate to interrogate
Eastern New Mexico has a strong solar resource, and a production estimate built on a statewide or Albuquerque assumption may not reflect your address accurately in either direction.
Ask what data source the estimate used, whether it applies location-specific irradiance for your address, and for the annual figure in kilowatt hours rather than only in dollars.
Ask what it assumed about module temperature. Hot summers reduce efficiency, and a model applying irradiance without temperature correction overstates output in exactly the months production peaks.
Ask about soiling and about annual degradation. Panels lose a small amount of output each year, and a model that holds production flat across twenty-five years is overstating the back half of the projection.
What a projection here needs to contain
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 receives no federal tax credit. Section 48E survives at 30 percent for third-party owners under leases and power purchase agreements.
The state Solar Market Development Tax Credit remains at 10 percent up to $6,000, first come first served against a $30 million annual cap, with the application due to EMNRD within one calendar year after the year of installation.
Add the gross receipts tax deduction, the property tax exemption, and net metering at the retail rate under the arrangement matching your utility and system size.
Then add the electricity you stop buying, from an estimate that accounts for temperature, soiling and degradation. Ask for the AC rating stated and the application timeline agreed before you sign.