If you've bought a portable generator or you're planning for backup power in your DFW home, you've probably run into this question: should I get a generator interlock kit or a transfer switch? Both connect your generator to your home's electrical system safely. But they work differently, cost differently, and suit different situations. Here's what you actually need to know.
A generator interlock is a mechanical device installed on your existing electrical panel. It physically prevents the main breaker and the generator breaker from being on at the same time — which is what keeps your generator from back-feeding power onto the utility grid and endangering lineworkers. With an interlock, you manually switch between utility power and generator power at the panel.
Typical installed cost in DFW: $400–$1,400, depending on your panel brand, location, and whether a generator inlet is included.
A transfer switch is a dedicated subpanel that isolates selected circuits from the main panel and allows you to power them from a generator. Manual transfer switches require you to flip a switch; automatic transfer switches (ATS) detect an outage and switch over without any action from you.
Typical installed cost in DFW: $800–$2,500+ for a manual transfer switch. Automatic transfer switches for whole-home standby generators run higher — call for a quote based on your specific setup.
Yes — generator interlock kits are fully legal in Texas and compliant with the National Electrical Code (NEC) when properly installed by a licensed electrician with a permit. In most DFW cities, an electrical permit is required for the installation. Grizzly pulls the permit, handles the inspection, and makes sure everything is done to code. Don't let anyone install an interlock without pulling a permit — it's a safety and liability issue.
It depends on your situation. Here's a straightforward comparison:
For most DFW homeowners with a portable generator, an interlock kit paired with a proper generator inlet is the most cost-effective solution. For whole-home standby generators, an automatic transfer switch is the right call.
Whether you go with an interlock or a transfer switch, you'll also need a generator inlet — the outdoor connection point where you plug your generator into your home's wiring. This is a separate installation from the interlock or transfer switch, and it also requires a permit in most DFW cities. Grizzly installs both as part of a complete generator connection package.
Grizzly Electrical Solutions installs generator interlocks and transfer switches throughout the Dallas-Fort Worth area — Rowlett, Plano, Garland, McKinney, Frisco, Richardson, and beyond. We pull permits, handle inspections, and do the job right the first time. Call (469) 863-9804 or contact us here for a free estimate.
Grizzly Electrical Solutions serves Rowlett, Garland, Plano, Richardson, and the greater Dallas–Fort Worth area. Get a quote or call for 24/7 emergency service.