For most households a long outage is spoiled groceries and a cold shower. For a household with an oxygen concentrator, a feeding pump, a power wheelchair, or a refrigerated injection, the same outage is a countdown with a number attached. The difference between those two experiences is rarely money. It is whether anyone did the arithmetic in advance.
Two systems exist that most affected households never touch: the registry your electric utility keeps, and a federal map that already counts people like you by ZIP code.
What enrolling with the utility actually does
Electric utilities keep a list of customers whose health depends on the meter. The name changes by company: medical baseline, critical care, critical load, life support registry. The idea is consistent. The utility flags the address, sends extra notice before a planned shutoff, and in some states bills more of the household's usage at the cheapest tier.
California runs the version with the clearest public paperwork. The state's Medical Baseline program gives an additional allowance of gas and electricity at the utility's lowest rate, and eligibility runs through either a qualifying condition or a qualifying device. The published list covers life support equipment, paraplegia and quadriplegia, multiple sclerosis, scleroderma, and a compromised immune system. A doctor has to sign the application, so the paperwork moves at the speed of a clinic rather than a storm.
Here is the part people misread. Being on the list does not put your house on a protected circuit. Crews restore in the order that brings back the most customers per repair, and one flagged address does not jump that queue. What the flag buys is warning, a record that someone at the utility knows, and in some territories extra help: Southern California Edison hands out free portable backup batteries to enrolled customers in high fire risk areas. Enrollment is worth an afternoon. It is not a plan.
Counting electricity-dependent neighbors from Medicare claims
In 2015 the federal government started publishing something genuinely useful for local planning. The HHS emPOWER Map takes Medicare claims for electricity-dependent durable medical equipment, strips the identifying details, and publishes monthly totals down to the ZIP code, layered over live hazard data for storms, flooding, wildfire, and earthquakes.
The map exists so a county emergency manager staring at a forecast can see how many people in a ZIP have billed Medicare for equipment that stops when the lights go out. Anyone can open it, and two uses are worth your time. If your ZIP shows a few hundred electricity-dependent beneficiaries, you are not an unusual case, you are part of a documented population. And a county that has never mentioned this group in its hazard plan is ignoring a number its own health department can pull in a minute, which is a fair thing to raise at a public meeting.
One limit matters. The map counts Medicare beneficiaries, so a thirty-year-old on a home ventilator with private insurance appears nowhere in it, and every local count understates the real population.
Runtime math you can do on paper in ten minutes
Every backup decision starts with one number: how many hours a charged battery will run a given device. The label gives you watts, or amps and volts that multiply into watts. The battery gives you watt-hours. Divide the second by the first, then cut fifteen percent for conversion losses.
A device drawing forty watts against a five hundred watt-hour battery lands somewhere near ten usable hours. The same battery against a machine drawing two hundred watts gives you a bit over two. Heated humidifiers and anything else that warms air or water draw several times what the base device does, and switching that feature off is often the difference between one night and three. Run the arithmetic on your own labels in daylight, and redo it whenever a device is replaced.
Choosing between a battery, an inverter, and a generator
Three options cover almost every household, and they fail in different ways.
| Power source | What it is good for, and where it stops |
|---|---|
| Portable battery station | Silent, safe indoors, recharges from a wall or a car; capacity is fixed and refilling it needs power from somewhere |
| Car with an inverter | Already in the driveway and cheap to add; the engine must run outdoors, never in an attached garage |
| Portable generator | Runs heavy loads for days on fuel; exhaust is lethal indoors and fuel has to be stored and rotated |
The generator rule is not advisory. Federal guidance puts portable generators at least twenty feet from windows, doors, and attached garages, pointed away from the house, with working carbon monoxide alarms on every level inside. The gas is colorless and odorless, and every winter it kills people trying to keep a device running.
Cold storage for medicine when the fridge stops
Refrigerated medication follows different rules from refrigerated food, and mixing them up is expensive in both directions. A closed refrigerator holds its temperature for roughly four hours, a full freezer for about forty-eight. Food that sat above forty degrees for two hours or more gets thrown out.
Medicine is stricter. Federal guidance says to discard refrigerated medication after an outage longer than a day unless the label says otherwise, and to ask the prescriber how to replace it. That conversation goes better before the storm than after it. Ask how long the drug tolerates room temperature, and what the pharmacy's replacement policy is after a documented outage.
The cheap preparation is frozen water bottles filling the gaps in the freezer, a cooler staged where you can reach it in the dark, and a rule that the door stays shut.
Three calls to make while the power is still on
- Your electric utility. Ask for the medical or critical care registry by name, what proof and whose signature the form needs, and what enrollment changes about notification and restoration.
- The prescriber or equipment supplier. Ask for a written outage plan for each device, the runtime of any built-in battery, and what the supplier does when a delivery falls inside a declared emergency.
- Your local emergency management office, on the non-emergency line. Ask whether the county keeps its own registry, whether any designated shelter has powered outlets for medical equipment, and how transport works if you cannot drive yourself.
One boundary worth stating out loud: the emergency number is for a medical emergency, not a dead battery. Dialysis centers, oxygen suppliers, and home health agencies run their own storm protocols, and the time to learn yours is a weekday morning.
Building the one-page sheet this week
- List every device that must keep running, with its watts and its hours on whatever backup you own.
- Write the utility account number, the registry enrollment date, and the outage reporting number at the top.
- Add the prescriber, the supplier, and the pharmacy, with after-hours numbers rather than office numbers.
- Name a fallback address with power, and confirm that the person there expects you.
- Note which medications are refrigerated and what each label says about time at room temperature.
- Tape a copy inside a cabinet door, photograph it, and set one calendar reminder a year to check the numbers again.
The sheet takes an evening, and the references behind it are public: enrollment rules through your own utility and, in California, the state's Medical Baseline program page, plus the checklists on the federal Ready power outage page. A household that knows its own runtime does not panic when the lights go out. It starts a clock it has already counted down once.