# Wildfire Mitigation for Utility Companies: How to Upgrade Distribution Lines

**Author:** Julio Martinez

**Published:** October 11, 2026

**Last updated:** October 11, 2026

**Category:** Electric Utility & Cooperatives

**URL:** https://draftech.com/blog/wildfire-mitigation-engineering-services

**Title tag:** Wildfire Mitigation for Utility Companies: A Guide (2026)

**Meta description:** Wildfire mitigation for utility companies: compare covered conductor, undergrounding and sectionalizing against route conditions and utility protection studies.

**Visible word count:** 2720

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A utility can approve a wildfire mitigation budget while the route remains too uncertain to design. The map identifies an exposed feeder, but it does not establish whether existing poles can carry covered conductor or whether an underground alternative has a usable easement. Those gaps change the work being purchased.

We approach the assignment as distribution engineering for a specific corridor. This guide explains what to request from an engineering partner and how to compare the resulting packages. The utility supplies its mitigation priorities; we turn the selected treatment into a design that can be checked against actual field conditions.

## How to Choose Wildfire Mitigation Upgrades for a Distribution Circuit

Wildfire mitigation for utility companies means selecting distribution upgrades that address the circuit's ignition exposures. We compare 5 treatment families through [grid hardening engineering](https://draftech.com/services/electric-utility-engineering/grid-hardening-engineering/), checking supports for covered conductor, [undergrounding](https://draftech.com/services/electric-utility-engineering/overhead-to-underground-conversion/) feasibility and sectionalizing requirements from the utility's protection study. We carry the selected treatment into a route-specific design.

Begin with the failure mechanism. A conductor-contact concern points toward different work than a deteriorated pole supporting otherwise acceptable wire. We need the utility to identify the concern it wants addressed before we compare treatments. A stronger support cannot remove every contact exposure, and a covered conductor cannot repair an inadequate foundation.

### Owner Inputs Establish the Assignment

The utility's approved program should identify the feeder sections under consideration. It should explain each section's selection. We use that boundary to define survey coverage. An unlabeled shaded area on a planning map is insufficient when the design must distinguish a main feeder from the laterals that remain overhead after a conversion.

Ask for the operating model behind the map. The source configuration and alternate feeds matter when a proposed device changes the circuit arrangement. We also need the owner's construction standards, including their revision dates. Where the utility has approved a deviation, its limits belong in the design basis rather than in an email that never reaches the checker.

Set the acceptance criteria early. Engineering proposals should distinguish assumptions that support preliminary alternatives from field observations required for final design. If property access is unavailable, we identify the affected segment and the calculation it prevents. Calling the survey substantially complete does not resolve the missing span.

### Field Measurements Must Support the Comparison

We reconcile the asset map with the route before committing to reuse, because pole identity needs to connect the inspection record to the structure in the loading model. Survey captures attachment elevations and span geometry; condition information establishes whether the structure is a candidate for retention. A map coordinate alone does neither.

Clearance measurements need context. A conductor position observed during a field visit provides a starting point for checking the completed line under the required loading and temperature conditions. We record enough information to evaluate the controlling case under the applicable utility criteria instead of treating the survey photograph as the calculation.

Access can alter the preferred treatment before material is chosen. An overhead rebuild may need a work position outside the existing traveled way, while an underground route may need room for pulling equipment at a bend. We bring those constraints into the alternatives review while relocation remains possible, because discovering them after permit submission can force both design and permit revisions.

Our own preference for retaining a usable overhead corridor has a limitation: it can make reuse look attractive before the structural checks are complete. We require the pole work to be priced with that option. Otherwise, the comparison favors a conductor change that cannot actually be installed on the assumed supports.

A request for proposals should let the engineer identify these dependencies without disguising them as a fixed construction schedule. We separate the design effort from outside approvals. Permit decisions and confirmed equipment delivery dates require separate tracking from utility reviews and equipment quotations.

## Compare the Treatment Before Selecting Hardware

The alternatives below address different parts of the feeder. Each has a specific role. We use this comparison to establish the investigation each option needs; the final selection follows the route evidence and the utility's accepted design criteria.

| Treatment | Design question | Required engineering evidence | Limit to retain |
| --- | --- | --- | --- |
| Covered conductor | Can the circuit support the selected system? | Conductor ratings and revised mechanical checks | Covering does not eliminate every ignition mechanism |
| Pole hardening or replacement | Can the support carry the proposed assembly? | Condition assessment and structural calculations | A stronger pole does not remove vegetation exposure |
| Clearance-driven redesign | Where does the controlling geometry fail? | Survey-based sag and clearance evaluation | Observed clearance is not every design condition |
| Targeted undergrounding | Is the buried route constructible and maintainable? | Civil alignment and cable-system design | Transitions and aboveground equipment remain |
| Sectionalizing | Can the proposed boundary isolate the intended section? | Protection coordination and configuration review | A device location alone establishes no protection benefit |

### Covered Conductor Changes the Mechanical Design

The U.S. Department of Energy's *Utility Wires Investments: Resilience Investment Guide*, published September 2024, describes covered conductor as a distribution hardening measure and identifies additional conductor weight as a reason stronger supports may be needed. That is a useful starting point for scoping. We also need the selected product's engineering data to complete the design.

We review the proposed conductor system against the feeder's electrical requirements and its support geometry. Covering changes the assembly being evaluated. The designer must use the actual outside diameter and weight in the mechanical model, then check the applicable sag and tension cases rather than carrying forward the bare-conductor assumptions.

Product compatibility matters at the attachment. Specify the hardware intended for use with the selected conductor system. Show the transitions into retained equipment. A material substitution can change more than the purchasing line item, particularly where a different assembly affects support loads or the space needed at a dead-end structure.

We keep claims narrow: covered conductor addresses certain contact-related exposures. It does not make the line safe to touch or excuse the clearance review. The owner should receive the design assumptions needed to maintain that system, including which existing components were retained and which were replaced.

### Pole Hardening Needs a Complete Load Path

Start with condition, then capacity. Replacing a deteriorated pole is a different decision from strengthening a serviceable structure for a heavier assembly. We retain that distinction in the pole schedule so the owner can see why each location requires work instead of receiving a replacement list with no supporting reason.

Guying must fit the site. A calculation that depends on an anchor outside the available property rights describes an unresolved design. Where the intended anchor cannot be installed, we revise the support arrangement and recheck the affected spans before presenting the pole as ready for procurement.

The same discipline applies to joint-use attachments. A new pole position or changed conductor elevation can require communications make-ready. Our discussion of [pole loading analysis inputs](https://draftech.com/blog/what-is-a-pole-loading-analysis) explains why the attachment inventory has to match the structural model. We cannot assume another owner's cable will move merely because a proposed drawing shows it lower.

### Clearance-Driven Design Starts With the Controlling Span

Locate the actual constraint. Raising one support may improve a crossing while changing adjacent spans enough to require another check. We evaluate the affected geometry as a connected line section, including the proposed conductor's behavior, rather than issuing an isolated pole-height change.

Vegetation clearance and electrical clearance also need distinct responsibilities. Engineering can establish the proposed conductor envelope and flag conflicts against the owner's criteria. The utility's vegetation program determines the authorized vegetation work. We show where the design depends on that work so neither scope silently assumes the other has already resolved the conflict.

When these checks expose a corridor-wide problem, our [electric distribution engineering services](https://draftech.com/services/electric-utility-engineering/) bring the route design and support calculations into the same review. The decision then rests on the geometry the field can build, with the remaining vegetation dependency stated plainly.

## Test Undergrounding Against the Whole Cable Route

Undergrounding removes the overhead conductor from the converted segment, but the route still has to function as an electrical installation. We assess the complete cable path. A short section of trench on an alternatives map says little about whether the pull can be completed or the equipment can be maintained.

Start at the transition structure and follow the cable to its termination. We check the alignment against existing utilities and available property rights. If a crossing requires a different construction method, its entry and exit geometry must fit the cable design. The bend that looks harmless on a plan can control the pulling arrangement.

### Civil Feasibility and Cable Ratings Belong Together

Burial configuration affects thermal performance. We need the installation assumptions used for the cable rating to agree with the civil section shown on the drawings. A later change in duct arrangement or burial depth therefore returns to engineering review rather than being treated as a drafting correction.

Repair access belongs in the comparison too. The proposed equipment site must remain reachable for the work the utility expects to perform there. We ask how a failed cable section would be accessed and replaced before selecting a route that fits within an easement but leaves no practical maintenance position.

**Check the transition first:** locate the overhead-to-underground connection before treating a buried segment as feasible. A constrained transition can move the cable alignment and change the permit footprint.

Our [overhead-to-underground conversion guide](https://draftech.com/blog/overhead-to-underground-power-line-conversion) develops that interface further. For the wildfire package, we keep the retained overhead sections visible in the comparison. An underground alternative cannot be evaluated honestly if the estimate omits the pole work required at its ends.

We compare alternatives over the same functional boundary. Include the equipment needed to serve the same loads and account for the restoration work each method leaves behind. A trench-only estimate and a fully installed overhead estimate describe different purchases; their apparent cost difference cannot decide the route.

## Sectionalizing Depends on the Utility's Protection Study

A sectionalizing location defines the electrical boundary of the section to be isolated. We need to know which circuit section the owner intends to isolate. Device capability and the upstream protection arrangement determine whether that boundary performs the intended function.

### Apply the Utility's Study to the Design

The utility or its protection engineer provides the **protection study** for the circuit configurations the design must support, including alternate supplies and distributed generation where relevant. Draftech does not perform protection coordination or relay studies. We use the utility-approved results to reflect the required device capabilities and locations in the distribution design, with the applicable study revision identified.

A sectionalizer and a fault-interrupting device have different capabilities, and the utility's protection engineer establishes how the selected equipment interacts with upstream protection. We reflect those study results in the equipment specifications and installation drawings. Any claimed isolation function must trace to that utility-approved basis; ignition exposures still require review after a device is installed.

**Settings remain the utility's responsibility.** The utility or its protection engineer supplies the approved settings and supporting study revision; we identify that revision on the drawings and reflect its equipment requirements in the design. If the utility changes the study, we reconcile the affected installation details before release, while the utility retains approval and operating authority.

Remote control adds an interface that must be commissioned. We establish the required communications inputs with the owner instead of assuming coverage at the proposed structure. If the engineering scope includes that interface, the acceptance criteria should state how the installed control is checked before the utility relies on it.

## Choose the Next Step by Design Readiness

**Cooperative with incomplete asset records:** authorize the field investigation before fixing the rebuild quantities. We recommend a defined survey boundary and an alternatives checkpoint, because pricing pole replacements from uncertain attachments transfers the uncertainty into the construction package rather than removing it.

**Utility with an established covered-conductor standard:** procure segment-specific application of that standard. Require the support checks and the transition details that prove it fits this corridor. An approved material family reduces selection work; it does not establish that every existing pole can carry it.

**Owner evaluating underground conversion:** resolve the civil route before committing to the cable package. Keep the conversion boundary consistent with the overhead alternative. We recommend carrying access restrictions into the estimate now, while the owner can still change the alignment without withdrawing a completed permit application.

### Make the Release Usable in the Field

The checker should be able to trace a proposed structure to its calculation and the field record that supports it. We reconcile the issued drawings with the material quantities before release. Where a permit condition changes the alignment, the revision must reach the engineering model too; a corrected sheet alone can leave the underlying design inconsistent.

Record how field changes return to engineering. A substitution affecting conductor geometry cannot be accepted solely because the replacement material is available sooner. We review its effect on the design and issue the necessary revision before the changed assembly is built. The closeout record then captures the accepted installation.

Draftech performs engineering 100% in-house. For owners buying full turnkey construction, Draftech-managed subcontract crews deliver the construction under Draftech's QA/QC and safety program. Active in 24 states. Available across all 50 U.S. states. Our [engineering and turnkey service scopes](https://draftech.com/services) let the owner define responsibility for the distribution package it is purchasing.

**Set the release boundary:** keep a segment awaiting property access out of the construction issue set. [Discuss the route's unresolved design conditions](https://draftech.com/#dt-contact) before treating it as ready to build.

When a covered-conductor concept still lacks verified pole capacity, or an underground option ends at an unworkable transition, we can scope the engineering needed to resolve that specific gap. Send the route boundary and the utility's design criteria to [info@draftech.com](mailto:info@draftech.com) so the proposed assignment addresses the decision holding up the package.

For a qualifying route, our [no-cost design offer](https://draftech.com/free-design) covers Draftech engineering for the first 20,000 linear feet, from feasibility and field survey through permit approval. The owner reviews each request before Draftech commits the package. Use that review to establish whether the proposed distribution route qualifies and where its engineering boundary begins and ends.

## Frequently Asked Questions

### How do utilities choose wildfire mitigation upgrades for distribution lines?

Start with the ignition exposure and compare treatments over the same circuit boundary. The 5 treatment families discussed here address different failure mechanisms, so we check whether covered conductor fits the supports and whether an underground route can be built and maintained. For sectionalizing, the utility or its protection engineer supplies the study, and our design reflects its approved results.

### Can covered conductor be installed on existing poles?

Sometimes, but retaining a pole requires both condition and capacity review for the proposed assembly. The September 2024 DOE Utility Wires Investments guide identifies added conductor weight as a potential reason for stronger supports. We evaluate the selected system against the actual structure and its span geometry; a serviceable pole does not automatically have capacity for the changed loading.

### Does undergrounding eliminate the need for overhead design?

No. The 2 interfaces at the ends of a bounded conversion segment can still require transition structures and changes to retained overhead plant. We evaluate those interfaces with the buried cable route so the civil design does not end at an unusable connection. Equipment placement and repair access remain part of the comparison, even when the conductor itself is underground.

### Is a sectionalizing device enough to establish a mitigation benefit?

No, a device location alone establishes neither coordination nor the intended isolation function. For a feeder with 2 possible supply configurations, the utility or its protection engineer provides the protection study addressing the relevant conditions for each. We reflect its approved results in the distribution design; Draftech does not perform protection coordination or relay studies, and the utility retains operating authority.

### What does the no-cost route engineering offer cover?

Draftech engineers the first 20,000 linear feet of a qualifying route at no cost, from feasibility and field survey through permit approval. The owner reviews each request before Draftech commits the package. That review establishes whether the requested route qualifies and defines the engineering assignment, so a utility should submit its route boundary rather than assume every proposed segment is included.