What New Mexico Homeowners Ask About Solar Interconnection
Installing solar panels involves more than putting equipment on a roof. Before a grid-tied system can legally produce electricity, it needs to be approved and formally connected to the utility's grid — a process called interconnection. In New Mexico, where state policies have generally been supportive of residential solar, most homeowners move through this process without major friction, but there are common questions worth understanding before you start.
What Interconnection Actually Means
Interconnection is the formal relationship between your solar system and the utility's electrical grid. When your system generates more electricity than your home is using at any moment, that surplus flows back into the grid. For this to happen safely and legally, the utility needs to approve the system design and confirm it meets technical requirements for grid-tied operation.
The interconnection process typically happens between the solar installation company, the electrician, and the utility — not directly between the homeowner and the utility in most cases. Your contractor handles the applications and technical coordination. But understanding what's happening helps you follow the timeline and ask useful questions.
What Is Net Metering?
Net metering is the billing mechanism that makes solar financially viable for most homeowners. When your system exports electricity to the grid, the utility tracks that export and credits your account. When you pull from the grid — at night, on cloudy days, or when your loads exceed production — those credits offset what you owe.
In New Mexico, the Public Regulation Commission has oversight of net metering policy, and the specific terms — credit rates, how credits roll over, any caps — are set by each utility's approved tariff. The terms can and do change over time, which is why it's worth asking your utility specifically about their current net metering program before making decisions based on older information.
Who Manages the Interconnection Process?
Your solar installer or electrician typically handles the interconnection application to the utility. This includes submitting a single-line diagram of the system, equipment specifications, and whatever forms the utility requires. The utility reviews the application, may request changes, and ultimately approves the interconnection.
After the system is installed, the utility typically schedules an inspection of their own — separate from the city or county building inspection — to confirm the system meets their technical requirements before granting Permission to Operate (PTO). PTO is the green light that means your system can legally run in grid-tied mode.
Homeowners sometimes don't realize there are two separate approval steps: the building department permit and inspection, and the utility's interconnection approval. Both are required before the system can operate.
What Happens During a Power Outage?
This is one of the most common points of confusion for new solar homeowners. A standard grid-tied solar system automatically shuts off when the grid goes down. It does not continue supplying power to your home during an outage, even when the sun is shining.
This is an intentional safety feature. Utility workers repairing downed lines need to know that connected systems aren't energizing those lines. A grid-tied system that stayed on during an outage would be a hazard.
If backup power during outages is important to you, a battery system paired with your solar installation changes this — but it requires a different equipment configuration and separate interconnection consideration. Discuss this goal with your electrician or installer early in the planning process.
Questions to Ask Before Moving Forward
What utility territory am I in? PNM, El Paso Electric, and several smaller co-ops serve different parts of New Mexico. Interconnection and net metering policies vary between them.
What is the current wait time for interconnection approval? Utility timelines vary. In busy periods, interconnection approval can take several weeks after installation, which delays the PTO date.
Does the system design I'm considering have any special interconnection requirements? Some battery configurations, multi-system setups, or export limitations require additional documentation.
How will changes to net metering policy affect systems already installed? Utilities sometimes grandfather existing systems into current terms when policy changes. Ask your utility what protections apply to systems installed today.
Ready to Explore Solar for Your Home?
If you have questions about how interconnection works in your specific utility territory, request a solar service quote and we can walk through what the process looks like for your area.