Generac Generator Installation
in Nashville & Middle Tennessee
Generators of Nashville designs and installs Generac whole-home standby-generator systems for homeowners across Nashville and Middle Tennessee. Every installation is sized to your home's electrical loads, coverage goals, property conditions and fuel availability — not to whatever unit happens to be on a truck.
We are the specialized backup-power division of Evolution Electric, a licensed Tennessee electrical contractor with Generac dealer access and Generac University Air-Cooled HSB Installation training.
Why homeowners choose Generac standby power.
Generac is one of the most widely installed brands of residential standby power in the United States. Homeowners typically choose it for four reasons.
Automatic operation during outages
A properly installed Generac standby generator monitors utility power and starts automatically within seconds of an outage — no manual switches, extension cords or portable units to wrestle with.
Natural gas or propane fuel supply
Standby generators run on natural gas or propane, so runtime is limited by fuel availability rather than by a fixed battery capacity. That makes them well suited to longer or multi-day outages.
Whole-home coverage when sized correctly
With appropriate sizing and transfer equipment, a Generac generator can carry the electrical loads you care about most — HVAC, well pump, refrigeration, medical equipment, EV charging and general lighting.
Backed by a licensed electrical installation
The generator is only half the system. The transfer switch, service-panel integration, fuel connection and permitting all determine whether the equipment performs the way the manufacturer intended. That's the electrical side of the job.
Whole-home vs selected-load backup.
Every Generac installation ultimately answers one question: what stays on when the power goes out?There are two general approaches, and each has legitimate use cases.
Whole-home backup
The generator is sized to cover essentially everything in the home — HVAC, water heater, well pump, kitchen appliances, EV charging and general lighting/receptacles. The transfer switch is installed at the service level, and daily life continues almost normally during an outage. This is the most common choice for larger homes, rural properties on well water, and homes with medical or home-office requirements.
Selected-load (essential-circuits) backup
A load-management approach that prioritizes the circuits that matter most — often HVAC, refrigeration, well pump, a select group of receptacles and key lighting. A smaller unit can carry these loads while a load-shed module intelligently cycles higher-draw equipment. Homeowners often choose this route when the project scope must fit a specific electrical or fuel constraint, or simply to keep the installation more modest.
We present both configurations during the free assessment so the decision is yours, not the crew's.
How Generac generator sizing actually works.
Sizing is not a lookup by square footage. It's a load model. We collect the electrical characteristics of the equipment you want on backup, apply starting-current factors for motor loads, verify fuel supply, then match a Generac unit that can safely carry the actual demand without being needlessly oversized.
Square footage & occupancy
General baseline for lighting, receptacles and comfort loads.
HVAC configuration
Number of air handlers, tonnage, heat-strip or heat-pump backup, mini-splits.
Kitchen appliances
Electric range, oven, dishwasher, refrigerator, freezer, microwave, small appliances.
Water heating & well pump
Electric vs gas water heater, well pump horsepower, booster pumps, softeners.
Medical & lifestyle loads
Oxygen concentrators, CPAPs, chair lifts, home office, sump/ejector pumps.
EV charging
Level-2 EV chargers add substantial load and should be coordinated with the generator's capacity.
Fuel type & meter capacity
Natural-gas meter and regulator sizing, or propane tank size and vaporization rate.
The output of this exercise is the smallest Generac model that comfortably covers your target loads. Curious what a project like this looks like in practice? See our generator cost guide for what actually drives installation pricing in Nashville.
Transfer-switch integration is the electrical heart of the system.
The automatic transfer switch (ATS) monitors utility voltage, isolates your home from the grid during an outage, signals the generator to start, and reconnects utility power when it returns. It is the single component that determines whether the installation is safe, code-compliant and reliable.
We size the ATS to match both the generator and the electrical service, coordinate its location with the existing service panel, and integrate any load-management modules required to keep motor loads from overwhelming a smaller generator during startup. This is where a licensed electrical contractor matters more than a big-box generator sale.
Generator placement and electrical considerations.
A Generac unit is an outdoor combustion engine. Placement affects safety, code compliance, noise, and long-term serviceability.
- Clearances from windows, doors and fresh-air intakes per manufacturer and code
- Setback from property lines and structures required by your jurisdiction
- Proximity to the electrical service to minimize conductor runs and voltage drop
- Proximity to the gas meter or propane tank to minimize fuel-line pressure loss
- Level ground and a stable pad — composite pads or reinforced concrete
- Access clearance for annual manufacturer inspection and service by the homeowner or a service provider
- Consideration of prevailing wind direction, tree canopy and drainage
- Neighbor courtesy — orient exhaust away from patios and shared property lines when possible
Fuel-source coordination is part of the design.
Generac air-cooled home standby generators run on either natural gas or propane. The choice depends on what's already at the property and how long you want the unit to run without intervention.
Natural gas
If your home already has a natural-gas meter, we verify meter and regulator capacity, then run a gas line sized for the generator's demand. Runtime is limited only by utility supply.
Propane
For rural or off-main-line properties, propane is the standard. Tank size and vaporization rate are matched to the generator's fuel demand and to the outage duration you want to plan for.
Fuel work is performed by a licensed plumber where required by jurisdiction and coordinated as part of the overall installation.
Permits and inspections, handled correctly.
Standby generator installations in Tennessee require electrical permits, and gas work generally requires a plumbing permit. Some jurisdictions also require a mechanical setback review for the outdoor unit's placement.
We pull the appropriate permits, coordinate scheduling, meet the inspector on site, and address any punch-list items ourselves. This is a normal part of every installation, not an add-on.
Permits & inspections included in our installation scope.
What a Generac installation with us looks like.
Free backup-power assessment
We review your electrical panel, your home's typical loads and the outdoor site conditions. No pressure and no obligation.
Proposal & equipment selection
We match a Generac model to your load profile, fuel source and coverage goals — whole-home or a targeted-loads configuration.
Permits & utility coordination
We pull the electrical permit, coordinate with your gas provider where applicable and schedule the required inspections.
Site prep & pad installation
The generator is placed on a level composite or concrete pad, keeping clearances to windows, vents and doors per manufacturer and code requirements.
Electrical & fuel integration
Transfer-switch installation, service-panel work, generator wiring, fuel line by a licensed plumber where required, and equipment grounding.
Commissioning & homeowner walkthrough
We run the automatic transfer sequence, verify load pickup and walk you through exercise mode, alarms and homeowner monitoring.
Generac vs home battery backup.
Generac is often the right answer — but not always. We also design and install home battery backup, so we can compare technologies honestly rather than defaulting to whatever we happen to sell.
Generac Standby
Best for long outages, larger homes, rural properties, and anyone whose priority is unlimited runtime on natural gas or propane. Outdoor combustion unit.
Tesla Powerwall
Silent, indoor-safe lithium battery backup. Installs with or without solar and can grid-charge on its own. Often a great fit for homes that want backup without a fuel tank or an outdoor combustion unit.
See our full battery + generator services.
EcoFlow & Anker SOLIX
Modular, expandable whole-home batteries. Well suited to homes that want quiet, indoor-safe backup with room to grow, or to pair with rooftop solar over time.
If you're unsure which is right for your home, the fastest way to a real recommendation is our 60-Second Backup Power Quiz — it factors in home size, coverage priorities, fuel source and outage-duration expectations.
Why choose Generators of Nashville by Evolution Electric.
The generator is a big part of the project. The electrical installation is the other big part — and that's what determines whether the system performs the way Generac intended.
Generac-trained installation professional
Completed Generac University's Air-Cooled HSB Installation training for whole-home standby generator installation.
Generac dealer access
Evolution Electric maintains a Generac dealer account with access to the manufacturer's professional dealer network and purchasing system.
IBEW journeyman electrician
Professional electrical experience backed by rigorous IBEW apprenticeship training and journeyman-level expertise.
Licensed Tennessee electrical contractor
Over a decade of electrical experience. The installation is performed and backed by a licensed Tennessee electrical contractor — not an equipment reseller.
IBEW journeyman training reflects our electrician's professional background; it does not imply endorsement, certification, sponsorship or affiliation between IBEW and Generators of Nashville or Evolution Electric.
Middle Tennessee homeowners we serve.
Nashville and the surrounding counties. If you're outside this list, ask — we frequently serve neighboring areas by request.
Common questions about Generac installation.
Do you install Generac generators throughout Middle Tennessee?+
Yes. We install throughout Davidson, Williamson, Rutherford, Sumner, Robertson, Montgomery and Cheatham counties. If you're outside those, ask — we often serve neighboring areas by request.
Do I need a whole-home generator or a smaller unit?+
It depends on which loads must stay on. Some homeowners want everything covered so life continues as normal. Others prioritize HVAC, refrigeration, well pump, medical equipment and a subset of lighting circuits. We design either configuration and explain the trade-offs before you commit.
How is the size of a Generac generator determined?+
By modeling the actual electrical loads you want on backup, applying appropriate starting-current factors for motor loads, and checking the fuel supply's ability to deliver required flow. We do this during the assessment rather than guessing from square footage alone.
Can I get a Generac generator if I have propane instead of natural gas?+
Yes. Generac air-cooled home standby units are dual-fuel and can run on either natural gas or propane. Tank size, regulator and line sizing are then coordinated to match the unit's demand.
What is a transfer switch and do I need one?+
A transfer switch safely disconnects your home from the utility and connects it to the generator during an outage — automatically, in most residential installations. It is required for any permanently wired standby installation and is a core part of the electrical scope.
Are permits required for a Generac installation in Tennessee?+
Yes. Standby generator installations require electrical permits, and gas work generally requires a plumbing permit. We handle both, and we schedule the required inspections. Some jurisdictions also require a mechanical setback review for the outdoor unit's placement.
Is a Generac generator better than a home battery like Tesla Powerwall?+
It depends on the outage profile and the home. For long outages and rural properties on natural gas, a Generac often makes the most sense. For homes prioritizing quiet indoor operation, indoor placement, or a solar-plus-storage strategy, a Tesla Powerwall, EcoFlow or Anker SOLIX battery is often a better fit. We install all four and will show you a genuine comparison rather than pushing one platform.
Get a Generac plan for your home
in about 60 seconds.
Answer a few quick questions and we'll follow up with a right-sized Generac recommendation — or a battery alternative if that turns out to be a better fit for your home.