Natural Gas Standby Generators: Costs, Efficiency, and Sizing

Updated September 26, 2026

A natural-gas standby generator may be convenient and economical during outages, but it does not automatically reduce a household’s utility bills—and no responsible buying guide can promise a fixed 73% savings. Standby generators usually consume fuel to produce backup electricity, so the real decision is whether the reliability and automation justify the purchase, installation, maintenance, and operating costs for your home.

Understand what “savings” could mean

A standby generator is normally used when utility power fails, not as a routine replacement for grid electricity. Natural gas may cost less or be easier to store than gasoline for extended outages, but total costs depend on local fuel rates, generator load, efficiency, outage duration, and service needs. Compare cost per delivered kilowatt-hour using local rates rather than a national percentage claim.

Size the system from actual loads

List essential circuits such as refrigeration, well pump, furnace blower, sump pump, medical equipment, lighting, and communications. Motors and compressors need extra power when starting. Central air conditioning and electric heat can dramatically increase generator size. A qualified installer can perform a load calculation and determine whether load management would cover priorities more efficiently.

Check natural-gas capacity

The gas meter and piping must deliver adequate pressure and volume at full generator load while other appliances are operating. Pipe diameter, length, fittings, and meter capacity affect performance. Do not assume an existing outdoor gas connection is sufficient. Have the fuel system evaluated before selecting the final model.

Compare the complete package

The generator is only one component. Confirm the transfer switch type and amperage, load-management equipment, pad, cold-weather accessories, warranty, monitoring, permits, and installation labor. The transfer equipment must isolate the home from the utility to prevent dangerous backfeed.

Current Briggs & Stratton choices

Prepper Hideout currently lists options ranging from the PowerProtect 13kW to the PowerProtect 22kW NGMax and PowerProtect+ 26kW. Browse the home standby generator collection for current packages and specifications.

Before buying

• Complete a professional load calculation.
• Verify output on natural gas, not only the headline rating.
• Have the meter and piping assessed.
• Confirm transfer-switch and service compatibility.
• Plan code-compliant placement with safe exhaust clearances.
• Budget for scheduled maintenance and exercise fuel use.

Choose a standby generator for dependable outage coverage, not an unsupported savings promise. A correctly sized complete system provides the clearest value.