Decision Guide
Idaho Power PSPS: Should You Get a Standby Generator?
Published September 9, 2026 · Updated September 9, 2026
Short answer
If you are in the Boise Foothills, southern Ada County or the valley's rural edges, yes — those are the zones Idaho Power has named as most likely to see a Public Safety Power Shutoff, and events have run 8 to 16 hours. In dense Boise on a short feeder, the case is weaker.
What a PSPS actually is
A Public Safety Power Shutoff is Idaho Power deliberately de-energizing lines when high wind combines with dry fuel, to prevent its equipment starting a wildfire. It is a last resort, it is planned, and — unlike a storm outage — you usually get warning.
The first time Idaho Power used that authority in the Boise area, more than 8,000 customers across the north and east edges of the city lost power. It happened during a heat wave that had topped 99 degrees for a record 17 consecutive days. Customers were texted an estimated duration of 8 to 16 hours. Roughly 55,000 customers received warning notices that morning.
This is now a standing operational tool, not a one-off.
Who is most exposed
Idaho Power has identified higher-risk zones based on vegetation, weather patterns, fire history and structure density. The areas named as most likely to see shutoffs:
- The Boise Foothills
- Southern Ada County
- Rural communities including Emmett, Homedale and Parma
If you are in Eagle's foothills, on acreage in Kuna or Star, or anywhere the terrain rises, you are more exposed than someone in central Boise.
Customers outside active PSPS areas can still be affected. During elevated fire risk, Idaho Power increases the sensitivity of protective devices and limits automatic re-energization of tripped lines — which means more outages and longer ones, even without a formal shutoff.
The winter half of the problem
PSPS gets the attention, but winter produces a different failure mode. Riming — heavy frozen mist accumulating on conductors — and snow loading put mechanical stress on lines, and restoration in terrain can be access-delayed.
A summer PSPS costs you air conditioning and a freezer. A January outage in a house with a heat pump and no wood stove is a different kind of problem.
When a generator genuinely pays
The case is strong if you have:
- A well pump. A property with no water becomes unlivable far faster than one with no cooling. This is usually the deciding load on acreage.
- No alternative heat source and a heat pump.
- Medical equipment that cannot lose power.
- Significant refrigeration — a chest freezer of game or a wine room.
- A home office with no tolerance for a lost working day.
The case is weaker if you are in a dense Boise neighborhood on a short feeder with gas heat, a gas range and a gas water heater. You will be restored quickly and you can cook and stay warm meanwhile. We would rather tell you that than sell you a generator you do not need.
What to size it against
The honest question is not "run everything" but "run what for how long."
Summer: air conditioning is the hard load, because a condenser's starting inrush is several times its running current. A generator sized on running watts alone will stall trying to start it.
Winter: heat pump backup heat is the hard load. Electric resistance strips can draw more than the compressor, and sizing to run them means a much larger machine than sizing to keep the house above freezing on the compressor alone.
Acreage: the well pump, which has its own substantial starting current.
Load management is the middle path: a smaller unit that automatically sheds non-essential loads — water heater, dryer, one HVAC zone — carries a larger house for most of an outage at materially lower cost.
The safety point that is not optional
Never connect a generator to your house through an improvised connection. Backfeeding a de-energized line puts lethal voltage onto conductors that Idaho Power crews are working on — and during a PSPS, crews are actively patrolling lines before re-energizing them. A listed automatic transfer switch makes that physically impossible, and it is why a permitted installation is not just bureaucracy.
Bottom line
If you are in the Foothills, southern Ada County or on rural acreage, PSPS is a predictable, repeating, day-long outage and a standby system pays for itself in events you can plan for. If you are in central Boise on gas appliances, it probably does not. Call 208-856-4826 and we will tell you which one you are.
Related questions
How much warning do you get before a PSPS?
Idaho Power sends notices in advance — around 55,000 customers received warnings the morning of the first Boise-area event. That advance notice is what makes PSPS different from a storm outage, and it is why preparation is actually possible.
Will a portable generator do?
For a few circuits, through a correctly installed inlet and interlock, yes — and it is much cheaper. What it will not do is start automatically, run a well pump plus HVAC, or work while you are away from the house. Never run one through an improvised connection.
Does surge protection matter for PSPS?
It matters for the restoration. A planned shutoff ends with a controlled re-energization, and every switching operation is an opportunity for a transient. Service-level surge protection is cheap relative to the HVAC control boards and heat pump inverters it protects.