Las Cruces solar: exports pay fuel cost, so size for yourself

A cheap-power desert city, framed without spin

Las Cruces counted 111,385 people at the 2020 census, second in the state, sitting at 3,901 feet in the Mesilla Valley with a cool desert climate that runs long triple-digit stretches in summer and roughly 69 light-freeze nights a year, per the city's documented profile. Sun is not the question. Economics are.

EPE's 2024 average residential price across its 94,760 New Mexico customers worked out to about 10.16 cents per kWh, per EIA Table 6. That is cheap power by national standards, and cheap power stretches paybacks. Median household income here is $55,176 across 46,661 households, with 55.6 percent owner occupancy, per the 2023 ACS. So we will not tell you solar is a slam dunk for every Las Cruces roof. We will show you the levers that decide it.

The export rules, straight from EPE's pages

Under EPE's interconnection program for systems of 25 kW and under, net consumption in a billing period is billed at your normal rate, while net production is credited based on the fuel and purchased power cost adjustments. EPE installs a bi-directional meter and a separate REC meter. The application fee for a 1 kW to 25 kW facility is $150, and the program runs under New Mexico PRC rules 17NMAC9.568 and 17NMAC9.570, per the utility's interconnection documentation.

There is also a hard ceiling. Net metering is limited to systems expected to produce no more than 120 percent of your annual consumption, whether you own the system or a third party does. Between that cap and the fuel-cost export credit, the sane design brief writes itself: size at or under your actual usage, spend nothing chasing surplus.

A $250 permit you can pick up over the counter

The Community Development Department at 700 N. Main St., Suite 1100, phone 575-528-3222, handles residential PV, with applications through the city's Accela portal and counter hours Monday, Tuesday, Thursday, and Friday from 7:30 a.m. to 5:00 p.m., Wednesdays 8:00 a.m. to 2:00 p.m., per the department's page. The fee is a flat $250 covering plan review plus the building and electrical inspections, per the city fee schedule. Start work without the permit and the fee triples.

Better still, the city's expedited PV program issues over-the-counter permits for systems of 10 kW or less. The conditions are specific: arrays designed for 115 MPH wind with a 100 F design high and 10 F design low, load-side connection only, and a New Mexico professional engineer's structural analysis if the array adds more than 5 psf of dead load, a 45 pound point load, or 200 pounds per truss. Given the spring dust storms and wind this valley throws at rooftops, we consider that 115 MPH design number a feature, not red tape.

Two exclusions to know. Batteries are outside the expedited lane and need their own permit. And a home in the Mesquite, Alameda-Depot, or Mesilla Park historic districts, described in the Las Cruces Bulletin's district overview, loses the straight over-the-counter path because Planning must complete a zoning review first.

What a Mesilla Valley roof produces, month by month

Our model puts downtown Las Cruces at 1,895.8 kWh per installed kW per year, one of the strongest figures on this site. The curve peaks in April at 180.6 kWh per kW, not midsummer, because extreme June and July heat costs panel efficiency and the late-summer monsoon brings clouds. December still clears 139.8.

PVGIS v5.2 NSRDB, run by Solar Learning Lab on August 31, 2026, 30 degree tilt, 14 percent losses, downtown coordinates. Method documentation at PVGIS. Note the shape against the tariff: peak production lands in flat-rate spring months, while the pricey summer tail block arrives when heat has already shaved output. One more reason self-consumption sizing beats maximum-roof sizing here.

Pencil out a system before anyone pitches you one

The estimator uses the EIA average EPE price and our city production run. It cannot see your summer tail usage or the fuel-cost export credit, so treat the output as a first sketch that a serious quote must improve on with your actual bills.

The file drawer

Reviewed September 1, 2026. Every claim above traces to one of these documents.

• Las Cruces Community Development, city fee schedule, expedited PV permitting document, and Accela portal
• NM PRC utility directory, EPE Rate No. 01 tariff, EPE tariff index, interconnection under 25 kW, and interconnection process detail
• NSMDTC program page, EMNRD guide, SB 55 legislative record, and CVNM session outcomes
• Section 7-36-21.2 NMSA, Section 7-9-112 NMSA, and CRS IN12611 on the federal 25D repeal
• EIA Table 6, Census ACS 2023, Las Cruces city profile, historic districts overview, and PVGIS