The Utility Service Upgrade and Its Timeline

Why this matters

A service upgrade is the one part of an electrification job the shop does not control. The electrician controls the panel and the meter base. The inspector controls the inspection date. The utility controls the drop, the transformer, the meter and the day the power comes back, and it runs on its own queue. A shop that quotes "about two weeks" because its last upgrade took two weeks will, sooner or later, have a customer whose furnace was removed in October and whose new service is waiting on a transformer in January.

This card lays out the parts of the process, who owns each one, where the time goes, and how to set the customer's expectation so the plan survives the slow case. Whether the house needs an upgrade at all is a load question owned by the sibling card on measuring existing load, and the sibling card on alternatives to a service upgrade covers the ways to avoid one.

The parts, and who owns each

A residential service has a utility side and a customer side, and the line between them is set by the utility's service rules (approved by your state public utility commission), not by the electrical code. A common split:

• Utility side. The distribution line, the transformer, the service drop (overhead) or the service lateral (underground) up to the point of attachment or the meter, and the meter itself.
• Customer side. The meter base (often supplied or approved by the utility, installed by the customer's electrician), the mast or riser, the service entrance conductors, the main disconnect and the panel.

Some utilities own the underground lateral and some make the customer own it; some require the customer to dig the trench and set the conduit. Know your utility's split before you scope.

The sequence

1. Scope and load calculation. The electrician determines the new service size and what changes: a larger meter base, new service entrance conductors, a new mast, a new panel.
2. Utility service request. The electrician or the customer files a request to upgrade the service, usually with the new size and a load summary. This is the step that starts the utility's clock, so file it early.
3. Utility review and design. A utility planner or designer checks whether the existing drop, lateral and transformer can carry the new service. Often there is a site visit.
4. Permit. The electrician pulls the electrical permit from the authority having jurisdiction (AHJ, the local building or electrical department).
5. Utility-side work, if any. A larger drop, a new lateral, a transformer change, tree trimming along the drop.
6. The cutover. The utility disconnects the service, the electrician replaces the meter base, mast and panel, and the work is inspected.
7. Inspection and release. The AHJ inspects. In most jurisdictions the inspector's approval is what releases the service to the utility for reconnection, sometimes on paper, sometimes electronically.
8. Reconnect and meter set. The utility reconnects and sets the meter.

Where the weeks go

The electrician's part is usually a day of work. The calendar is everything around it.

• The utility's review queue. A simple upgrade where the existing drop and transformer are adequate can be reviewed in a few weeks. Utilities with heavy electrification or solar demand run longer queues.
• The transformer. A neighborhood pole-top or pad-mount transformer is often shared by several houses and sized for the load they had decades ago. If the design shows it cannot carry the upgraded house, it gets replaced, and transformer supply has been tight since the early 2020s, with lead times in some regions running many months. This is the single biggest variable.
• Excavation. An underground lateral replacement needs locates, possibly a street or sidewalk permit, and a crew. In cold regions, non-emergency excavation may wait for thaw.
• The disconnect appointment. Some utilities let a qualified electrician pull the meter for a same-day swap under the utility's authorization; others require a utility crew to disconnect and come back to reconnect, which means two scheduled visits.
• The inspection. Some AHJs inspect same day on request; some take several business days, during which the house may be without power unless the utility allows a reconnection on a temporary release.

Planning numbers worth giving a customer, as a shop's own starting points rather than a promise: a few weeks to a couple of months when the utility side is adequate, and several months when the transformer or the lateral has to change. Ask your utility for its current numbers every season, because they move.

The outage day

The cutover means the house is without power for most of a working day, commonly 6 to 10 hours for a meter base and panel replacement, longer if something on the utility side is also changing. Tell the customer in advance and walk through what that means for them:

• Medical equipment. Oxygen concentrators, CPAP, powered beds. This is a hard question, not a footnote. If someone in the house depends on powered equipment, the plan has to include battery backup for it or a day elsewhere.
• Heat and cooling. Schedule the cutover for a mild day. A house without power in deep cold loses heat steadily, and pipes in an exterior wall can freeze before evening.
• Refrigerator and freezer. Keep doors closed; a full freezer holds well for a day.
• Well pump, sump pump, garage door opener, internet, security system, electronic locks. Each one goes down. A sump pump in a wet week is a flooded basement.
• Work from home. The customer may want to be elsewhere.

Hazard on the cutover: the utility's disconnect is the only thing that makes the service conductors dead, and the line side of a meter base is energized until the utility opens it. Nobody on the shop's crew works on the meter base or service conductors until the utility has disconnected and the conductors are proved dead with a meter tested on a known live source before and after (per NFPA 70E Article 120 (120.5 in the 2021 edition, renumbered in 2024), with work practices at 29 CFR 1910.333(b)(2)). Pulling a meter under load can draw an arc, which is why many utilities forbid anyone but their own crews or authorized electricians from doing it. At reconnect, the main breaker stays open until the utility has set the meter and confirmed voltage, the electrician then closes the main with the branch breakers open and brings circuits on one at a time, standing to the side of the panel.

Worked example: a winter conversion meets a transformer

A customer signs in early September to replace a gas furnace with a cold-climate heat pump with electric backup, replace a gas water heater with a heat pump water heater, and add an EV charger. The load calculation says the 100 amp service must go to 200 amps. The customer wants the gas furnace gone before heating season.

• Week 1. The electrician files the utility service request and the permit application.
• Week 4. The utility's designer visits. The house shares a pole-top transformer with three neighbors; the upgraded load puts the transformer over its rating. A replacement is ordered. The utility will not give a date, only a range of "8 to 16 weeks for the transformer".
• Week 12 at the earliest, week 20 at the latest, for the transformer. Week 4 plus 8 is week 12; week 4 plus 16 is week 20. Then the cutover gets scheduled, which in this utility's territory has been running about two weeks behind delivery, so the new service lands somewhere around week 14 to week 22. Week 1 was the first week of September, so that window runs from early December into early February.

The original plan, furnace out in October, does not survive that. The shop's revised plan:

1. October: install the heat pump on the existing 100 amp service, and keep the furnace connected as the backup heat (a dual-fuel arrangement, see the sibling card on backup heat), so the heat pump does the heating and the electric strip heat waits for the upgrade. The heat pump alone fits the existing service; the strip heat would not.
2. Hold the EV charger and the water heater until the new service is energized.
3. After the cutover: add the strip heat or confirm the customer would rather keep the furnace as backup, install the water heater and the charger, cap the furnace's gas outlet and close out the gas service if nothing gas is left.

The customer is warm all winter, the shop is not on a callback list in January, and the gas furnace leaves on a mild day in spring instead of in a hurry.

What changes the answer. If the designer had found the transformer adequate, the same job runs about 4 to 6 weeks and the original plan works. If the customer had no gas furnace to keep (an electric resistance or oil system), the interim heat question becomes the hard one: an oil system can stay in place the same way, but a resistance furnace on a full 100 amp service cannot share it with a heat pump's backup strip, and the sequencing gets tighter. The order of the whole conversion is the sibling card The Whole-House Electrification Sequence, which owns this.

Setting the expectation

Say it before the contract, not after the utility calls:

• What the shop controls and what it does not. "Our part is a day. The utility's part is anywhere from a few weeks to a few months, and we find out which in the first month."
• The decision point. The utility's design review is when the timeline becomes known. Tell the customer you will call them with the real number when you have it, and do.
• The fallback plan. Never remove the only source of heat before the service that will replace it is energized. If the timeline turns long, the plan already says what happens.
• Who pays for what. Utility-side work may be covered by the utility or charged to the customer under its tariff. The shop does not know until the utility says. Do not promise it is free.

Failure modes in the field

• Filing late. The utility request goes in after the contract is signed and the equipment is ordered. File the request as soon as the load calculation says an upgrade is needed; withdrawing a request costs far less than waiting for one.
• Equipment in the garage for three months. Ordered to the original date, sitting in its crate. Order the parts that depend on the new service once the utility gives a date.
• The customer's own deadline. A home sale, a baby, a tenant moving in. Ask about it at the first visit.

References

• Your electric utility's service rules and tariff, as approved by the state public utility commission (ownership split, service request process, charges)
• NEC Article 230, as adopted by your jurisdiction (services); NFPA 70E Article 120 (120.5 in the 2021 edition, renumbered in 2024), and 29 CFR 1910.333(b)(2) for de-energized work
• See related: Measuring Existing Load Before You Sell a Service Upgrade
• See related: Alternatives to a Service Upgrade
• See related: The Whole-House Electrification Sequence