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What “burying a power line” actually involves
An existing overhead distribution circuit is normally replaced by a new underground system. Crews do not usually lower the same exposed wire into a shallow trench. They design a route, install duct or conduit and underground structures, pull in new cable, connect transformers and switching equipment, modify customer service connections where necessary, and test the system before transferring load.
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The work described here concerns local or neighborhood distribution conversion. Large transmission projects can use different engineering, permitting, land-acquisition and environmental processes, so the distribution sequence should not be treated as a universal transmission-line procedure.
- Planning: the utility evaluates why undergrounding is being considered and whether a route is feasible.
- Design and approvals: engineers, municipalities, property owners and other agencies settle the route, equipment locations, access rights and permits.
- Construction: crews trench or bore, install conduit and structures, prepare services, and place cable and equipment.
- Cutover: the utility energizes the new system and switches customers from overhead to underground service.
- Removal and restoration: after every affected service has transferred, the old facilities come down and disturbed public areas are repaired.
1. Project selection and feasibility
Why a utility may consider conversion
Utilities and local governments may study undergrounding for appearance, maintenance, reliability, safety or exposure to conditions such as high winds and vegetation contact. The reason matters because it shapes the route, the performance requirements and the alternatives considered. A project intended to reduce storm exposure may be evaluated differently from one initiated primarily for a streetscape improvement.
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In a community-led program, a city or other local government identifies a candidate area and works with the utility. Southern California Edison describes an early feasibility assessment by planners and surveyors before the project scope is established. At this stage, the team can identify conflicts with roads, drainage, existing utilities, rail corridors, private parcels, geology and available working space.
What feasibility work can establish
- Whether underground construction is physically possible along the proposed route.
- Where conduit, vaults, transformers, cable boxes and switching equipment could fit.
- How service connections would reach each affected property.
- Whether road closures, environmental review, railroad approvals or private easements will be needed.
- Whether another route, selective undergrounding or a non-construction mitigation would meet the objective with fewer impacts.
A feasibility decision is not a construction promise. The utility still has to produce a design, obtain approvals and establish funding before field work can begin.
2. Public process and detailed design
San Diego’s district model
San Diego provides a concrete example of a municipal process. The City Council creates an Underground Utility District after public hearings. Notices and maps are sent to property owners, defining the area under consideration. The city then works with the utility on design, gathers community input about equipment and streetlight locations, and coordinates surveys and property-connection planning.
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Design decisions residents may see
Designers map the main route, service laterals and locations for above-ground equipment. They also coordinate with water, sewer, telecommunications, transportation and drainage agencies. A line can be underground while some equipment remains visible: neighborhood systems may use pad-mounted transformers, cable boxes or pedestals near curbs so crews can operate and maintain the network.
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Community meetings and notices may address streetlight replacement, driveway access, tree locations, construction hours, traffic control and the appearance of cabinets. The final design must balance electrical clearances and operating access with sidewalks, parking, landscaping and private entrances.
3. Property access, easements and permits
When private property is involved
The route may stay entirely in a public right-of-way, but some projects require a service connection, conduit, equipment pad or access corridor on private land. The utility or municipality may request an easement or another access right. Read the project notice carefully: it should identify the area needed, the work proposed, restoration responsibilities and the contact for questions.
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Do not assume that a request for access means the utility can enter without an agreement. Rights vary by jurisdiction and by the existing franchise or easement documents. A property owner who is unsure what is being requested should ask for the plan and the legal instrument before signing.
Permits and outside approvals
Southern California Edison lists possible approvals such as road-closure authorization, environmental clearances, land-use permissions and railroad right-of-way approval. The required package depends on the route. Construction proceeds only after the necessary permits and land rights are in place, so an apparently ready design can still wait on an outside agency or property agreement.
Residents should rely on notices from their own utility and city for the controlling dates, work limits and access instructions. A general undergrounding schedule cannot replace those project-specific directions.
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4. Trenching, boring and service preparation
How the underground pathway is built
Crews may excavate an open trench, use directional boring for selected crossings, or combine both methods. They place conduit, vaults or other substructures, install warning and identification systems, and prepare the route for cable. The method depends on soil, existing utilities, road geometry, depth, environmental constraints and the need to keep traffic or property access moving.
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Preparing customer services
Electrical contractors may modify a building’s meter panel or other service equipment so it can accept the new underground connection. The utility may coordinate an appointment, inspection or temporary access window. Keep the service area clear and follow the stated preparation requirements; an unready panel can delay that property’s transfer even when the main conduit is complete.
Cable, transformers and switchgear
After the pathway passes inspection, crews pull or place the utility cable through the conduit and connect it to transformers and switchgear. The equipment is underground only where the design allows. Transformers, cable boxes and pedestals can remain above ground near curbs because operators need access for switching, protection and maintenance.
5. Testing, energization and the customer cutover
The utility tests the new circuit, verifies connections and confirms that customer service equipment is ready. It then transfers load from the overhead arrangement to the underground system. This is the point at which a planned interruption is most likely.
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Southern California Edison says a planned outage is required in most cases at the end of construction when switching customers, and that customers will be notified in advance if an outage is needed. That statement does not mean every project has the same interruption length or that an unspecified project will definitely have one. Follow the outage notice for the date, expected window and preparation instructions.
- Protect sensitive electronics with an appropriate uninterruptible power supply or by disconnecting them before the stated outage window.
- Keep electrically operated gates, garage doors, medical equipment and communications plans in mind.
- Do not reconnect or alter utility equipment; only the utility or its authorized contractor performs the cutover.
- Report an unexpected outage through the utility’s normal emergency channel rather than approaching an active work area.
6. When the poles and overhead wires come down
Overhead removal normally follows, rather than coincides with, underground construction. In San Diego’s process, the utility de-energizes and removes the old facilities after all properties in the district have switched to the new system. The sequence prevents a remaining customer from being left without a usable connection and allows the utility to retire the old circuit methodically.
Removal can include conductors, crossarms, transformers, communications attachments and poles, subject to the responsibilities of the different owners. A pole may remain temporarily if another utility or communications provider still needs it, or if a separate project has not yet completed its transfer. The project notice should identify what is included and who owns each facility.
7. Restoration of streets, sidewalks and landscaping
Pavement and public right-of-way
After conduit and connections are complete, contractors backfill and restore the excavated area. The finish may include asphalt, concrete, curbs, sidewalks, lane markings and drainage features. San Diego states that pavement restoration follows its Street Preservation Ordinance. Other jurisdictions use different specifications, inspection steps and warranty periods.
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Streetlights, trees and private areas
Undergrounding can require replacement streetlights or new locations for lighting equipment. Tree protection and replanting rules are also local. San Diego describes replanting a tree where the owner agrees to care for it. A private driveway, wall, planting bed or irrigation system may have a separate restoration commitment, so owners should document existing conditions and report damage through the project contact promptly.
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Restoration is not necessarily complete when the trench is filled. Final inspections, paving schedules, landscaping seasons and correction of settlement can extend beyond the day the electrical system is energized.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How long the process can take
Schedules vary with route length, permitting, property agreements, utility coordination, weather, geology and the number of services to transfer. The following figures are local examples, not a national standard.
| Phase or measure | Published duration or estimate | How to interpret it |
|---|---|---|
| San Diego design after district creation | 24–36 months | City of San Diego figure for its program; includes public and technical design work before construction. |
| San Diego construction and subsequent overhead removal on most large projects | 48–60 months | City of San Diego figure covering the underground system work, cutovers and later removal; not a national average. |
| Southern California Edison permit approval | As little as two months, or significantly longer | SCE says the circumstances of the project determine the actual approval time. |
Construction is often divided into trench and conduit work, cabling and connections, customer cutovers, and pole removal. A block may therefore look finished while the overall district remains active because another segment or property has not yet transferred.
What it costs and who may pay
California cost range
The California Public Utilities Commission reported estimates from California investor-owned utilities of $350 to $1,150 per foot, or $1.85 million to $6.072 million per mile, in 2019 U.S. dollars. The scope included trenching, conduit, substructures, cable and connections, meter-panel modifications, cutover, and removal of poles and wires. Population and building density, labor, terrain and geology can move a project toward either end of that historical range. It is not a current bid and does not predict an individual property owner’s bill.
California Rule 20 examples
| Rule 20 category | Funding description from the CPUC | Typical initiating party or condition |
|---|---|---|
| Rule 20A | 100% ratepayer-funded | Requested by local governments and subject to public-interest eligibility criteria. |
| Rule 20B | 20–40% ratepayer-funded | Has an applicant contribution; the exact share depends on the project. |
| Rule 20C | Majority funded by a municipality, property owner or developer | Used where the applicant bears most of the project cost under the applicable utility process. |
Applicants in California should consult the Rule 20 guidebook for their utility territory for application steps and timing. Funding outside California can be entirely different: a municipality, utility, developer, assessment district or individual owners may have different obligations under local law.
Benefits and trade-offs to weigh
Potential benefits
- Fewer exposed conductors and poles can improve the appearance of a street.
- Underground facilities are less directly exposed to some wind and vegetation-contact events that affect overhead lines.
- Removing poles can free right-of-way space after all attached facilities have been relocated.
Important limitations
- Undergrounding does not eliminate outages. The CPUC notes that underground faults can take longer to locate and restore.
- Underground facilities can be susceptible to flooding, and access for repair may require excavation.
- Trenching can be more disruptive during construction than installing an overhead line of equivalent rating. The UK government’s 2025 National Policy Statement for electricity networks infrastructure states: “Undergrounding an overhead line will mean digging a trench along the length of the route, and so such works will often be more disruptive – albeit temporarily – to the receptors listed above than would an overhead line of equivalent rating.” In that policy context, the statement is part of evaluating infrastructure impacts, not a prediction for every neighborhood project.
- Higher upfront cost, lifetime repair requirements, capacity upgrades, environmental effects, landscape and heritage impacts, and community disruption all belong in the comparison.
For a real overhead-versus-underground decision, compare engineering feasibility and route, upfront and lifetime cost, outage exposure and restoration time, construction and property access, environmental and heritage effects, and whether rerouting or another mitigation could meet the original objective.
What residents should do during a conversion
- Read the project map and notice. Confirm whether your parcel, frontage, driveway or service panel is included.
- Ask who controls each issue. The city may handle paving or traffic, while the utility handles electrical design, outages and service transfers.
- Clarify access rights. Request the proposed easement or entry terms before granting private access.
- Record existing conditions. Photograph pavement, walls, landscaping, irrigation and driveways before work starts.
- Plan for the notified outage. Arrange backup procedures for medical, security, garage and communication needs.
- Keep the work zone clear. Follow temporary parking, pedestrian and driveway instructions; never enter an excavation or handle utility equipment.
- Report restoration problems promptly. Use the project contact and keep a copy of the notice, photographs and repair request.
How to tell what applies to your project
Ask the utility or municipality for five specific documents or answers: the route map, the construction and traffic plan, the property-access terms, the cutover and outage notice, and the restoration standard. Those materials establish facts that cannot be inferred from another city’s program, including who pays, whether a panel upgrade is needed, when poles will be removed and what surface will be replaced.
The practical sequence is consistent enough to anticipate—plan, approve, build, connect, switch, remove and restore—but the legal process, funding, duration and resident obligations remain local. Treat California Rule 20, San Diego’s district process and Southern California Edison’s timing as examples to understand the lifecycle, not as rules for every utility project.
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