Power outages are predictable — ice storms, hurricanes, wildfires, grid maintenance. A generator turns an outage from a crisis into an inconvenience. Two main approaches: portable generators (cheap, manual, limited coverage) and standby generators (automatic, whole-home, expensive). Both have their place; the right choice depends on outage frequency, length, and what you need to power.

This guide is organized the way the decision actually plays out in practice: what matters, what does not, and the reasoning behind each recommendation. Numbers and ranges reflect 2026 Connecticut, Massachusetts, and New York conditions and pricing.

Quick answer

Portable generators: $500-$2,500 for unit; require manual setup each outage; 15-25 year life; can't support central HVAC without specific backfeed setup. Standby generators: $4,500-$18,000+ installed; automatic activation within seconds of outage; run on natural gas or propane; 20-30 year life; can support whole home with proper sizing. Essential add-on: automatic transfer switch ($500-$2,500). Sizing: portable 5-8 kW for essentials (refrigerator, furnace, some lights); standby 14-26 kW for most single-family homes. Critical safety: never run portable generators indoors, in garages, or within 20 feet of windows — CO poisoning is the leading generator-related fatality.

Field context

Cost ranges published in a guide like this are benchmarks, not guarantees. Each range reflects a band within which most fair-market invoices actually land — low end for a clean, uncomplicated job in normal business hours, high end for predictable complications and peak-season pricing. The middle is where most real invoices sit. The ranges are built from trade-association wage data, aggregated regional cost-guide benchmarks, manufacturer and retailer equipment pricing, and current utility rebate schedules. Three important caveats follow from how the ranges are built.

First, the ranges are not negotiating targets. Contractors price to their local market, their own overhead and schedule, and the specific scope of the job in front of them. A contractor whose bid comes in near the middle of the published range is not overcharging; a contractor whose bid falls 15% below the low end is usually missing scope rather than offering a better deal. The useful pattern is three bids on identical written scope, not a single bid compared to the published range.

Second, the ranges shift materially with seasonality, location, and labor market conditions. Peak heating and cooling seasons push HVAC and plumbing invoices 10-20% higher than shoulder seasons. Coastal Connecticut, Boston metro, and New York City metro labor rates run 15-25% above national averages. The ranges here are calibrated to 2026 CT/MA/NY conditions; readers in markedly different markets should adjust expectations.

Third, cost is not the same as value. The lowest number that completes the job correctly, with licensed work by a contractor who stands behind it, is usually the cheapest outcome over a 10-year horizon even when it is not the cheapest invoice in the quote stack. Most homeowners who look back at a major project with regret report choosing on price alone.

Generator types

Portable gasoline generator

Wheeled unit with 120V and 240V outlets. Runs on gasoline.

Pros: cheapest; versatile; usable elsewhere.

Cons: manual setup each outage; fuel storage issues; CO risk; limited power.

Portable propane/natural gas generator

Like gasoline but cleaner fuel, longer-lasting.

Inverter generator

Quieter, cleaner power (sine wave), more efficient. Good for sensitive electronics.

Cost: $800-$3,500.

Standby generator

Permanently installed, automatically activates during outage. Runs on natural gas or large propane tank.

Cost: $4,500-$18,000+ installed.

Solar + battery backup

Not a traditional generator but serves similar function. See solar article.

Sizing

Essential circuits only (5-8 kW)

  • Refrigerator
  • Furnace or boiler (not AC)
  • Some lights and outlets
  • Sump pump
  • Well pump (if applicable)

Expanded essentials (10-14 kW)

Add:

  • Kitchen receptacles
  • Some bedrooms
  • Small AC or window unit

Whole home without central AC (14-20 kW)

All circuits except central AC.

Whole home with central AC (20-26 kW+)

Full coverage including central AC.

Large home with electric heat or EV charging (26-40 kW)

Larger standby units; dual-fuel configurations.

Automatic transfer switch (essential for standby)

A transfer switch senses utility power loss and starts the generator, then switches home circuits from utility to generator. When utility power returns, it switches back and shuts the generator off.

Without an ATS, you're back to manual generator operation — effectively a large portable generator.

Installation requirements for standby

  • Concrete pad or gravel base
  • Natural gas or propane connection
  • Electrical connection to ATS and panel
  • Proper clearances (manufacturer-specified, typically 18 inches from house, 5 feet from windows/doors)
  • Permit and inspection

What standby installation actually costs in 2026

National ranges.

Scope Low end Typical High end
Portable gasoline generator (5-8 kW) $500 $1,200 $2,500
Portable inverter generator (3-5 kW) $800 $1,500 $3,500
Standby generator unit (10-14 kW) $3,500 $4,800 $6,500
Standby generator unit (20-26 kW) $4,500 $7,500 $11,500
Standby generator unit (large, 30-40 kW) $8,500 $14,000 $22,000
Automatic transfer switch $500 $1,200 $2,500
Professional standby installation (typical) $2,500 $4,500 $7,500
Full turnkey standby installation $6,500 $11,000 $18,000
Full turnkey large home installation $12,000 $18,000 $28,000
Natural gas line extension $500 $2,500 $8,000
Propane tank installation (for sites without gas) $800 $2,500 $6,500
Concrete pad $300 $650 $1,500
Annual maintenance $175 $300 $500
Permit and inspection $100 $300 $800

Safety: the CO warning

Portable generator carbon monoxide kills dozens of people every year, particularly after storms.

  • Never run indoors — including garage with door open
  • Never run in basement, shed, or enclosed porch
  • Minimum 20 feet from house
  • Point exhaust away from house
  • CO detector in the house
  • Newer generators with CO shutoff are a meaningful safety improvement

When to call a professional

Standby installation is professional-only. Portable generator operation is homeowner scope but electrical connection to home circuits requires a transfer switch installed by an electrician.

Stela Home earns no referral fees from contractor connections.

Diligence and documentation

Diligence on cost management centers on three practices. First, written scope before any contractor conversations. A scope document listing every line item — equipment, labor, materials, permits, disposal, warranty terms — standardizes quotes and exposes where contractors are pricing differently. Second, three competitive bids on identical scope, not three contractor interviews followed by loose estimates. Third, license and insurance verification through the relevant state registry, plus two references on similar jobs completed in the preceding two years. These steps take a few hours and routinely save five to fifteen percent on the final invoice, independent of any negotiation.

Documentation at the back end matters as much as diligence at the front. A paid invoice with itemized scope, photographs of the completed work, and a record of any permits pulled belongs in the homeowner's records — not just for warranty claims but for the eventual resale, where a documented maintenance and improvement history routinely adds real value at closing. The homeowners who build this habit from day one of ownership tend to recover disproportionately more of their project costs when they sell; the homeowners who treat records casually tend to give money back at inspection.

Bottom line

The honest bottom line on cost: the right number is rarely the lowest quote. It is the lowest quote attached to complete scope, licensed work, and a contractor whose license, insurance, and references check out. Every one of those three items has quietly saved more money than bid negotiation in the long arc of home ownership.

Related Stela Home coverage

How Stela Home helps

Three Stela Home tools work together on this kind of decision:

  • Stela Report — pre-purchase property intelligence with disclosure, condition, and risk flags.
  • Repair Calculator — modeled cost ranges by category and ZIP, calibrated with regional and complexity multipliers.
  • Stela Guides — step-by-step repair walkthroughs reviewed by licensed professionals, with safety callouts and disclosure.

Sources and further reading