Why an underground service upgrade can cost more than the new panel

A bigger panel can require work beyond the panel

A Bay Area homeowner on Reddit considering a 100A-to-200A change reported high quotes and conflicting schedules for an underground service upgrade. The numbers in that discussion are not transferable quote evidence. The useful issue is scope: replacing a panel and increasing utility service can involve different work. Underground routes can add civil and coordination requirements that a photograph of the panel does not reveal.

Source: Upgrading electrical panel to 200amps

Read the tariff and the construction requirements together

PG&E Electric Rule 16 governs service extensions and separates applicant responsibilities, utility responsibilities and payments. The Greenbook gives service construction and equipment requirements. They serve different purposes: a compliant trench design does not answer who pays, and a tariff cost allocation does not establish a construction detail. Use the project’s written design and agreement to join those two records.

PG&E’s project-resources page identifies the 2026 Greenbook and applicable updates, plus a transition for qualifying earlier contracts. Confirm the governing edition with the project coordinator before pricing a route from an older PDF. State which existing conduits and facilities are accepted for reuse and which remain subject to investigation.

Source: PG&E Electric Rule 16: Service Extensions · PG&E Project Resources: 2026 Greenbook, updates and transition rules

Two 200A projects can have different underground routes

Illustrative scenario: two neighbors both want higher service capacity. One has a reusable route that the utility accepts for the project; the other needs a new crossing through finished paving and a different equipment location. The same nominal service target can produce very different construction. A quote that excludes restoration may appear attractive until the owner discovers that driveway, landscape, or hardscape work remains outside the electrical contract.

Draw the service delivery and ownership boundaries

Ask for an ownership and scope drawing from the utility connection point to the customer equipment. Identify excavation, conduit, conductors, trench inspection, backfill, surface restoration, traffic control where applicable, and access or easement requirements. Mark items still awaiting utility direction. Avoid proceeding with a trench based only on a contractor's generic assumption if the utility must approve its route or construction requirements.

Identify allowances and concealed conditions

Compare estimates using the same confirmed scope and stated allowances. Separate equipment, electrical labor, civil work, utility charges, permits, and restoration. Unknown subsurface conditions should be handled explicitly rather than concealed in a fixed promise. Have qualified professionals coordinate utility locating and excavation. Owners should not use a forum burial-depth recommendation as a construction specification for a utility service.

Sequence acceptance, inspection and utility completion

Before procurement, consider whether the desired new loads require the proposed capacity or whether a supported alternative could meet the operating need. If an upgrade remains appropriate, sequence design acceptance, customer work, inspections, and utility completion. Preserve as-built routes and photographs before concealment. Those records help future solar, charging, or electrification projects understand the infrastructure that was actually installed.

Ask what a transformer charge actually includes

A Reddit owner with overhead service questioned being charged for a transformer after a small load increase. It does not establish that a particular charge was correct or incorrect. Request PG&E’s written line items and applicable tariff basis: standard utility facilities, applicant civil work, excess service cost, requested special facilities and any applicable allowance are different categories.

Rule 16 separates the utility transformer from applicant work such as space, supporting facilities and access; utility ownership does not settle cost allocation. Under F.1.a, when PG&E determines its existing service facilities need replacement, the new-service-extension provisions apply. Ask which allowance and project classification govern, rather than assuming replacement means all work is free.

Relocation and conversion requests follow different rules: Rule 16 F.2.b assigns PG&E’s total estimated costs to the applicant for a requested relocation or rearrangement of existing PG&E service facilities agreed to by PG&E. Under F.4.b, an overhead-to-underground conversion for the applicant’s convenience requires the applicant to handle excavation and furnish and install the supporting underground structures, then pay PG&E’s total estimated installed cost to complete the new service and remove the overhead facilities.

E.7 specifically assigns distribution-line or service-extension costs for plug-in EV charging above the residential allowance to PG&E as common facility costs. Its footnote extends that interim policy indefinitely unless CPUC revises it. Ask PG&E to identify the eligible EV-related line items and excluded work in writing. This is not a promise to pay for every load increase, a customer panel, all civil work or a requested relocation.

Source: PG&E Electric Rule 16: Service Extensions · PGE wants to charge ME because their power transformer can't handle small electrical upgrade

Define what restoration means on the finished site

A narrow trench patch is different from full-width driveway resurfacing. Mark the included paving, landscaping and irrigation boundaries and identify who repairs each. Explain how unknown buried conditions change the price. A utility-accepted underground installation does not by itself establish that every owner-selected finish has been restored.

Put it into practice

A decision table to keep handy