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Office open Mon to Fri, 7:30 to 5. Service and repairs: (603) 555-0143

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Keeplight Standby Power · Concord NH

Home standby generators · Concord, NH

Steady power for your home, sized honestly and kept ready.

We sell, install and service home standby generators across the Concord region. We size from what you actually want running, put the permits and the transfer switch on the quote, and come back every year so it starts when it should.

Get a quote How big do I need?
  • Free site visit and written quote within two business days
  • Installed ranges from $9,800, permits and switch included
  • We repair most standby brands, not only ours
A home standby generator on a gravel pad beside a blue-sided house, with the transfer switch and disconnect boxes mounted on the wall behind it

Hemlock 22 kW

Ready

Utility
Normal
Last exercise
Tue 10:00
Battery
13.2 V
Next service
April
Example controller readout, drawn for this page.

Where do you want to start?

Installed prices

What a working system costs, not just the generator.

Online prices are often the box alone. These ranges are for a running system in a typical home around Concord, with everything below included.

  • Generator and automatic transfer switch
  • Composite pad (air-cooled) or poured concrete pad (liquid-cooled)
  • Gas or propane line up to 30 ft from the meter or regulator
  • Electrical run up to 30 ft between the unit and the switch
  • Town electrical and gas permits, filed by us
  • Inspection booked and attended by us
  • Startup, test under real house load, and weekly exercise set
See every size and what changes the price

  1. 10 to 14 kW Air-cooled

    Essentials Smaller homes, or larger homes that only need heat, well, fridge, sump, lights and internet.

    $9,800 to $13,500

  2. 18 to 22 kW Air-cooled

    Most whole homesWhere most homes land Typical 1,800 to 3,000 sq ft homes with gas or oil heat, a well, and one central air system.

    $13,500 to $18,500

  3. 24 to 26 kW Air-cooled

    Larger homes Bigger homes, two AC systems, heat pumps, or an electric range you want to keep using.

    $16,500 to $21,500

  4. 30 to 48 kW Liquid-cooled

    Large and all-electric Large or all-electric homes, 400 A services, home offices and workshops that cannot pause.

    $27,000 to $42,000

Example ranges for this demo. Your written quote comes after a free site visit.

What an outage looks like

About fifteen seconds of dark, then an ordinary evening.

A standby generator does not need you home. Here is the usual sequence when the utility power drops and comes back.

  1. 0 s Utility power drops The transfer switch notices within a second.
  2. ~5 s It waits to be sure Short flickers do not start the engine.
  3. ~10 s Engine starts It warms up for a few seconds before taking load.
  4. ~15 s House moves over Heat, well, fridge and lights come back on.
  5. Later Power returns It waits a minute, hands the house back, then cools down and goes back to Ready.

Timings are typical for air-cooled home units and vary by model and settings.

A row of houses with their windows and porch lights glowing during a heavy evening snowfall
A snowy evening on a street like the ones we serve.

How an install goes

Four to eight weeks, and most of it is paperwork we do.

  1. Week 0

    Site visit

    About an hour at your house.

  2. Week 0 to 1

    Written quote

    Within two business days.

  3. Week 1 to 4

    Permits and fuel

    We file. Gas utility or propane supplier schedules their part.

  4. Week 3 to 6

    Install day

    One day air-cooled, two days liquid-cooled.

  5. Week 4 to 8

    Inspection and startup

    Town inspection, startup under load, walkthrough.

Full details on the standby installation page.

Fuel

Natural gas or propane: whichever your street has.

Gas reaches parts of Concord and a few towns around it. Most rural roads run on propane. We check your address before the site visit, so the quote is built on the right fuel from the start.

Natural gas

Piped to the house by the utility. Nothing to refill.

  • Reaches parts of Concord and a few neighboring towns
  • Most air-cooled units make about 10% less power on natural gas, so we size for it
  • The utility may need to upgrade your meter, which can add a few weeks
  • No tank, no deliveries, runs as long as the gas flows

Propane

Stored on site in a tank your propane supplier sets and fills.

  • The usual choice on rural roads without gas service
  • A 500-gallon tank (filled to about 80%) runs a 22 kW unit for roughly a week at half load
  • Your propane supplier sets the tank; lease or buy through them
  • We coordinate the tank spot, the regulator and the line to the generator
Two white propane cylinders set on the ground beside a building in autumn leaves
Propane is stored on site. Your supplier sets the tank; we run the line and set the regulator pressure for the generator.
Close-up of a remote monitoring module with status lights mounted on the side of a standby generator enclosure

Maintenance plans

A generator that waits all year still needs a visit.

Oil, filters, plugs and the battery age even when the unit only exercises. Every plan visit ends with a transfer test under your house's real load and a written report. Plans never renew unless you say yes.

  • Annual

    $289/yr

    1 visit a year

  • Twice a year

    $449/yr

    2 visits a year (spring and fall)

  • Monitoring add-on

    $99/yr

    Added to either plan

Read the plan terms

From neighbors we have worked for

Read more reviews, including the four-star ones

  • Ruth walked through the house with a list and asked what we actually needed. They talked us out of the bigger unit and put a load module on the dryer instead. The quote matched the bill to the dollar.

    Margaret H., Hopkinton 22 kW standby install · March 2026

  • Our generator showed a red light and the company that installed it had closed. Kofi found a dead battery and a loose plug wire, showed me both, and had it running the same visit.

    Dev P., Bow Repair, another installer's unit · January 2026

  • Good install and a tidy crew. It took longer than we hoped because the propane company was slow setting the tank, which Keeplight warned us about. Four stars only because of the wait.

    Carol and Jim W., Canterbury 18 kW on propane · November 2025

Talk to a person

Call (603) 555-0142 and a person answers during office hours. Each line below goes to the person who handles it.

Call (603) 555-0142

Site visits are free

Ready when the next outage is.

Tell us about the house in five short steps and we will book a site visit. Or start with the sizing calculator and bring the estimate with you.

Get a quote Estimate my size

Prefer to talk? (603) 555-0142, weekdays 7:30 to 5.

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