Comparison
Portable vs standby generator
Northern Illinois loses power from three directions: summer derechos, winter ice, and transformer failures on aging feeders. The question is not whether you will lose power but what happens to your house while it is out.
That framing matters, because the honest comparison between portable and standby is not really about cost. It is about whether the protection has to work when nobody is home.
Portable generator
Manual setup, refuelling, cords
$700 – $1,500
Standby generator
Automatic, permanent, natural gas
$6,500 – $16,000
| Factor | Portable generator | Standby generator |
|---|---|---|
| Equipment cost | $700 – $1,500 | $6,500 – $16,000 |
| Installation | None, or $1,200 for an interlock kit | $2,000 – $4,000 included in system price |
| Starts automatically | No — someone must be home | Yes, within seconds |
| Runs while you are away | No | Yes |
| Fuel | Gasoline, refuel every 6–10 hrs | Natural gas, unlimited runtime |
| Protects a sump pump overnight | Only if someone stays awake to refuel | Yes |
| Can run central air | Rarely | Yes, if sized for it |
| Permit required | Yes, for a transfer switch or interlock | Yes — electrical and gas |
| Annual maintenance | Minimal, plus fuel stabiliser | $200 – $450 per year |
| Adds value at resale | No, it leaves with you | Yes, it is a fixture |
The verdict
Which one you should actually choose
A portable is genuinely enough if…
Your outages are short, you are usually home when they happen, your basement does not flood without a sump pump, and nobody in the house depends on powered medical equipment. Paired with a properly installed interlock kit, a portable will run a fridge, a furnace and some lighting perfectly well for a few hours.
You need a standby if…
You have a sump pump and a yard that drains toward the house. This is the decisive case. An outage during a storm is precisely when the sump is needed most, and a generator that requires a human to be home, awake, and willing to go outside in that weather is not protection — it is a plan that fails on the night it matters.
A standby is also the right call if…
You are on a well, so an outage means no running water at all; someone in the household uses powered medical equipment; you travel and the house sits empty in winter; or you work from home and a day without power costs more than the annual maintenance contract.
Either way, do not backfeed
Running a portable generator into a dryer outlet with a double-ended cord — a 'suicide cord' — puts line voltage onto utility conductors that a lineworker believes are dead. It is illegal, it kills people, and a proper interlock kit costs a few hundred dollars. This is the one place in home electrical work where cutting the corner endangers somebody other than you.