Five grid-equipment manufacturing projects announced between February 2025 and July 2026 have disclosed enough facility detail to replace the editorial estimates in Groundbreak's first tier map. Several of those estimates were wrong. The 28-foot clear-height minimum I used for the components tier does not match the 16–18-foot building HSP converted in Charlotte. The 1–5 MW power range I assigned to the same tier has no support in any comparator's disclosed electrical load. What follows replaces those figures with what the announced projects put on the record.
Tier summary
| Tier | What it produces | Disclosed investment range | Tier-3 viable? |
|---|---|---|---|
| Bushings and instrument transformers | Porcelain and dry-type transformer bushings, current and voltage transformers for substations | $18.5M–$106M | Yes |
| Switchgear and power-distribution assemblies | Metal-clad switchgear (4.76–48.3 kV), integrated power-distribution enclosures | $6.1M (Jabil contract-cell investment; OEM tooling separate) | Yes |
| Distribution/medium-power transformer assembly | Pad-mount and substation transformers, typically below 100 MVA | $102.5M | Yes |
| Large-power-transformer final assembly | Substation transformers above 100 MVA, autotransformers, generator step-up units | Not disclosed (Muscle Shoals) | No |
| Repair and refurbishment | Rewind, retank, oil processing, life extension of installed base | Insufficient data | Viable but omitted |
Out of scope
Large-power-transformer final assembly sorts most tier-3 markets out on shipping constraints alone. Virginia Transformer's Muscle Shoals plant requires roughly 600,000 square feet on 90 acres, a dedicated Norfolk Southern rail spur, and 1,100 workers for a product range of 2–500 MVA. Finished large power transformers exceed federal highway weight and dimensional limits; they move by heavy-haul rail or barge with oversize-load routing. Add the workforce depth, the test infrastructure, and the capital scale, and this tier is competing in a different class of market.
Repair and refurbishment is a viable tier-3 opportunity but is omitted here. Public facility data for active repair operations does not support binary attribute thresholds. The tier also carries a distinct regulatory profile: mineral-oil-filled equipment manufactured before July 2, 1979 may require PCB characterization before work begins, and oil-handling operations above 1,320 gallons of aggregate aboveground storage trigger SPCC plan requirements under EPA's oil-spill prevention rules. When comparator data supports it, this tier warrants its own map.
Tier 1: Bushings and instrument transformers
What this tier produces and who it sells to
Transformer bushings — porcelain-housed and dry-type, 25 kV through 765 kV — are the insulated conductors that carry current through a transformer's grounded tank wall. Instrument transformers (current transformers and voltage transformers) provide scaled-down signals for substation metering and protection systems. Both are components installed into larger equipment. Downstream buyers are transformer OEMs, switchgear assemblers, and utilities purchasing replacement units for installed substations.
Why it's moving now
Bushing lead times have been among the longest-duration bottlenecks in the transformer supply chain because the U.S. manufacturing base was thin before demand surged. Three projects are adding domestic capacity: PFIFFNER in Franklin, Georgia ($18.5 million, up to 60 jobs, operations expected 2027); Hitachi Energy in Alamo, Tennessee ($106 million expansion, 100 jobs, HVDC and dry bushings through 800 kV, mid-2027 target); and HSP in Charlotte ($60 million+, up to 140 jobs, 25–765 kV dry-type bushings, opened July 2026). The April 2026 DPA Section 303 determination on grid infrastructure equipment adds federal procurement and financing authority behind that capacity.
Charlotte is a metro, and this piece is not about Charlotte. The building HSP converted and the ramp-up model it used are what transfer to smaller markets.
Attribute thresholds
Physical site. Franklin is a greenfield build for up to 60 employees. Charlotte converted an existing industrial building at 800 Westinghouse Boulevard — marketed at 124,560 square feet with 16–18 feet of clear height, later expanded to what the city reports as 215,000 square feet. HSP reports 170,000. The discrepancy is unresolved. HSP added a high-voltage laboratory rated to 2,800 kV, which almost certainly required purpose-built high-bay space beyond the original clear height. Alamo is a 60,000-square-foot expansion of an existing Hitachi Energy operation.
The checkable question: do you have an existing industrial building of 50,000–125,000 square feet for an initial operation, or a pad-ready site for a purpose-built facility? Clear height below 20 feet does not automatically disqualify, since Charlotte started at 16–18 feet. But the prospect will need to tell you whether their test equipment and product line require high-bay additions.
Pre-conversion electrical service at Charlotte was 3,000-amp, 480-volt, three-phase with transformer capacity of 1.75 MVA. No comparator discloses actual operating demand. The earlier Groundbreak estimate of 1–5 MW is unsupported. Confirm three-phase 480V service availability and ask the utility whether the site's existing or planned transformer capacity can be upgraded to the prospect's stated load within their construction timeline.
No comparator discloses crane capacity for bushing operations. The prospect must specify.
Logistics. Finished bushings for the 230–765 kV class are large but within standard highway limits. Interstate access within 10 miles. Rail is advantageous but not universally required — Franklin and Charlotte are highway-served. Inbound materials (porcelain, resin, conductor, hardware) arrive by truck.
Workforce. Franklin's announcement names electromechanical assemblers, machinists, machine operators, and electrical and mechanical engineers. HSP trained U.S. employees at its German operations and stationed experienced German personnel in Charlotte during ramp-up. That is the mentor-cadre model in practice. The company imports the specialized knowledge and the city supplies trainable workers with adjacent skills. West Georgia Technical College is Franklin's identified apprenticeship partner.
The checkable workforce asset is a community college with existing electromechanical, machining, or industrial-maintenance programs within commuting distance. At this tier's scale (40–140 jobs), the binding constraint is quality of the training relationship, not pipeline volume.
Qualification pathway. Bushings are tested to IEEE C57.19.00 and IEC 60137. Instrument transformers are tested to IEEE C57.13. Tests include dielectric withstand, impulse, partial discharge, and ratio/accuracy measurements.
Read HSP's 2,800-kV in-house laboratory as a requirement, not an amenity. High-voltage bushings need on-site test capability because the units are too large and the test sequence too integrated with production for routine external testing. A facility's BIL rating — basic impulse insulation level, the voltage a product must withstand from a simulated lightning strike — determines the highest product class it can ship without sending units out. HSP tests to 2,800 kV. PTT's transformer operation tests to 650-kV BIL. The prospect's target voltage class sets the required test infrastructure, and that infrastructure drives a significant share of both the capital cost and the building specification.
Qualification timeline: HSP began assembly in February 2026, opened in July 2026, and expects first 230-kV deliveries by end of 2026 — roughly 10 months from assembly start to initial shipment. First 765-kV deliveries are planned for early 2028, approximately two years after assembly began. These are company schedules, not confirmed customer-acceptance dates. As in the precision-components piece, the date that matters to a jobs projection is not the ribbon cutting but the day a customer's quality organization authorizes that building to ship that part.
Permitting/regulatory. Dry-type bushings — HSP's product line — involve no bulk oil handling, which keeps the environmental permitting profile lighter than oil-filled transformer work. The high-voltage test laboratory may require electrical permits and safety clearances specific to your jurisdiction. If the prospect manufactures oil-impregnated porcelain bushings, SPCC applicability and secondary containment requirements enter the picture. Ask which insulation technology they use. That answer determines the permitting path.
Demand-side position. Bushings sell to transformer OEMs, who are themselves capacity-constrained and adding domestic production, and directly to utilities replacing installed units. A director's demand-side advantage is proximity to transformer manufacturers and to regions with high concentrations of public-power and cooperative utilities that purchase replacement bushings through their own procurement. APPA reports the highest state counts for public-power providers in Nebraska (143), Iowa (134), Minnesota (125), Kansas (118), Ohio (86), Missouri (85), Wisconsin (83), Texas (77), North Carolina (74), and Indiana (73). Cooperative density is highest in the South and Midwest. These counts indicate potential counterparties. They do not indicate procurement authority.
Tier 2: Switchgear and power-distribution assemblies
What this tier produces and who it sells to
Metal-clad switchgear rated 4.76–48.3 kV per IEEE C37.20.2, plus integrated power-distribution enclosures. These are the switching, protection, and distribution systems installed in utility substations, industrial facilities, and commercial buildings. Buyers are utilities, industrial end users, data center operators, and electrical contractors.
Why it's moving now
The Jabil/Siemens announcement in Prince George County, Virginia on May 27, 2026 is the clearest signal. Jabil is establishing a roughly 300,000-square-foot contract manufacturing operation to produce Siemens medium-voltage switchgear and integrated power-distribution systems, projecting 352 jobs. Jabil's own capital investment is $6.1 million; the OEM's product tooling and design investment are separate and undisclosed. Production is planned for fall 2026.
Prince George is the only publicly disclosed contract-cell switchgear project at this writing, so treat it as a structure rather than a trend. It is the OEM-backed contract-cell arrangement described in Issue #5: Siemens owns the product design and quality system, Jabil provides manufacturing execution, and neither owns the building. Other switchgear OEMs face the same domestic capacity constraints and could place similar cells elsewhere. The April 2026 DPA Section 303 determination covers switchgear alongside transformers and bushings.
Attribute thresholds
Physical site. The Prince George building is a former advanced-manufacturing facility offering approximately 300,000 square feet, 28–36 feet of clear height, two 10-ton bridge cranes, and three 2-ton cranes. Electrical service is 480-volt, three-phase with seven switches totaling 28,000 amps and dual 25-MVA feeds from Prince George Electric Cooperative. These are inherited specifications from a prior tenant — an aerospace manufacturer — not Jabil's measured consumption. The building probably exceeds what switchgear assembly strictly requires. It still establishes what one OEM found acceptable.
The checkable threshold: an existing building of 200,000+ square feet with clear height above 28 feet, overhead crane service in the 10-ton class, and three-phase 480V power. Alternatively, a pad-ready site where a spec building of that profile is financeable. Switchgear assembly is less crane-intensive than transformer work, since individual units are lighter than transformer cores, but completed switchgear line-ups are long and the assembly floor has to hold parallel production bays.
Logistics. Switchgear ships by flatbed truck. Interstate access within 10 miles. Rail is not required. Shipping is frequent — switchgear is produced to order in moderate volumes — so proximity to the customer base matters more than heavy-haul capability.
Workforce. Prince George's announcement includes a state-customized recruitment and training program. Switchgear assembly requires electrical assembly technicians, wire harness fabricators, sheet-metal workers, and quality inspectors with electrical testing competence. In the contract-cell model, the OEM provides the product-specific training curriculum. The city provides the trainable labor pool and the training infrastructure.
At 352 projected jobs, this is the largest single-facility workforce among the comparators. That scale requires a labor market with measurable depth in electrical assembly and industrial manufacturing employment. Check BLS Quarterly Census data for existing employment in NAICS 335 (electrical equipment manufacturing) and adjacent codes within commuting distance. A community college with electrical technology, industrial maintenance, or mechatronics programs is the relevant pipeline.
Qualification pathway. Switchgear is tested to IEEE C37.20.2 and IEC 62271-200. Type tests — short-circuit, internal arc, temperature rise — are performed on representative samples and can use external laboratories. Routine production tests for dielectric withstand, mechanical operation, and wiring checks occur on every unit and require in-plant capability. That in-plant test infrastructure costs less than the equivalent for high-voltage bushings or transformers, because the voltage levels are medium rather than transmission class and the equipment is correspondingly smaller.
The contract-cell arrangement compresses the qualification timeline substantially. The OEM's existing type-test data and UL listings typically transfer to a new production location after a UL Initial Production Inspection, which requires engineering review and factory audit but not full re-testing of the product design. Prince George was announced May 27, 2026 with production planned for fall 2026 — roughly four months — because the product design, quality system, and certification all belong to Siemens.
Permitting/regulatory. Switchgear assembly is an enclosure, wiring, and testing operation at medium voltage. No bulk oil handling, no high-temperature processing, no significant air emissions. Standard industrial building permits and electrical permits apply. If the operation includes paint or powder-coat finishing for enclosures, check whether your jurisdiction requires an air permit for coating operations. Of the three tiers mapped here, this one carries the lightest permitting profile.
Demand-side position. Switchgear demand is broad-based: utilities, industrials, data centers, commercial construction. In the contract-cell model, the OEM manages the order book, and the city's role is providing the production platform. What makes one platform more attractive than another is fairly narrow: available building stock in the 200,000+ SF range, a labor market with electrical assembly skills at wage rates competitive with the OEM's existing facilities, and a truck-based logistics position that reaches the customer base. A city with an idle former-manufacturing building and an underemployed industrial workforce has most of what this model selects for.
Tier 3: Distribution and medium-power transformer assembly
What this tier produces and who it sells to
Pad-mount distribution transformers, small and medium substation transformers, typically below 100 MVA. These are the units installed on utility poles, in ground-level enclosures, and in distribution substations. Buyers are investor-owned utilities, public-power systems, cooperatives, and electrical distributors.
Why it's moving now
Distribution transformers have been the most publicly visible grid-equipment shortage, with lead times that stretched past two years at peak. DOE has tracked the constraint through multiple supply-chain analyses. PTT's $102.5 million expansion in Raeford, North Carolina — two facilities totaling approximately 300,000 square feet, 217 projected jobs — is the tier-3 comparator. PTT is an established domestic manufacturer adding a dedicated pad-mount facility next to its existing operation. The April 2026 DPA Section 303 determination applies to distribution transformers alongside other grid infrastructure equipment.
Raeford is the only publicly disclosed greenfield-scale distribution transformer expansion by a domestic manufacturer at this writing. Other capacity additions in this product class have been expansions at existing OEM sites. A city pursuing this tier is chasing a project type with few active comparators and a window that is narrowing — as noted in Issue #1, lead times for some distribution-transformer classes have already shortened as new capacity comes online.
Attribute thresholds
Physical site. PTT's existing Raeford operation occupies ten acres and 56,000 square feet with a 60-ton lifting system. The expansion adds approximately 300,000 square feet across two buildings. Transformer assembly requires high-bay space; PTT describes a high-bay operation but discloses no clear-height figure. Core stacking, coil winding, tank fabrication, vacuum oil filling, vapor-phase drying, and high-voltage testing all occur under one roof or in connected buildings.
Minimum site: 10+ acres for an initial operation with expansion room. Building: high-bay industrial with overhead crane service in the 30–60-ton range, with the prospect specifying based on their largest unit. Floor loading has to carry transformer cores, winding equipment, oil-processing systems, and crane-column reactions. IBC baselines of 250 psf for heavy manufacturing are code minimums, not confirmation that a specific slab will hold this equipment. The prospect's structural engineer will evaluate.
Electrical service: three-phase 480V. PTT discloses vacuum oil filling, vapor-phase drying, oil de-aeration, and testing through 161 kV and 650-kV BIL — all significant power draws — but publishes no load figure. The earlier Groundbreak estimate of 3–15 MW for transformer work remains unsupported by any comparator record. Ask your utility whether the site can be served at the prospect's stated demand within their construction timeline, and what the study fee and lead time for a service upgrade would be.
Logistics. Distribution transformers ship by truck. Pad-mount units are heavy but within standard highway limits. Medium-power substation transformers at the upper end of this tier may require overweight permits. Interstate access within 10 miles. Rail is advantageous for inbound materials — electrical steel, copper, transformer oil in bulk — and for outbound shipment of larger units.
Workforce. Transformer assembly requires coil winders, core stackers, tank welders, vacuum-system operators, oil-processing technicians, and high-voltage test technicians. These are specialized skills with thin existing labor markets. PTT and Sandhills Community College launched pre-apprenticeship and apprenticeship programs in February 2026. Enrollment was four people across both programs. Eaton and Waukesha County Technical College ran a 120-hour coil-winding boot camp for six employees in 2022.
Both examples point the same direction. Transformer-specific training is employer-initiated, small-scale, and built around the manufacturer's proprietary processes. The city's workforce asset is a community college willing to co-develop a custom program, plus a labor market with adjacent industrial skills — welding, machining, electrical maintenance, crane operation. At 217 projected jobs in a skill set with almost no existing labor market, the manufacturer will train most of that workforce from those adjacent skills. The training relationship and the depth of the local industrial pool are what a director can actually offer.
Qualification pathway. Transformers are tested to IEEE C57.12.90, covering resistance, ratio, polarity, loss, impedance, dielectric, temperature rise, and sound level. EPRI procurement guidance adds manufacturer audits, source-verification points, test-equipment calibration review, production witness testing, receipt inspection, and post-installation testing to the customer-acceptance path. PTT performs in-house testing through 161 kV and 650-kV BIL. A new facility must replicate that capability or contract it out.
PTT targets building completion in Q4 2026 and initial shipments in Q1 2027. That three-month gap reflects an established manufacturer with existing quality-system certifications, customer relationships, and trained personnel. A new entrant faces a longer path. UL requires notification, engineering review, and Initial Production Inspection before a new production location can apply the UL Mark. No public source establishes a universal duration for that process.
Permitting/regulatory. Environmental permitting adds calendar at this tier, and it is the only one of the three where that is true. Transformer assembly involves bulk transformer oil: receiving, storing, vacuum filling, processing. A facility handling more than 1,320 gallons of aggregate aboveground oil storage must prepare an SPCC plan, and secondary containment must hold the largest single container plus freeboard for precipitation. A pad-mount transformer operation will exceed that threshold. Vapor-phase drying may require an air permit depending on jurisdiction and process chemistry. Get SPCC review timelines and air-permit requirements from your environmental compliance office before you quote a site-readiness date to the prospect.
Demand-side position. Distribution transformers sell to every class of electric utility. The public-power and cooperative concentrations noted in Tier 1 apply here with more force, because distribution transformers are the product class those utilities buy most frequently and in the largest volumes. A city in a state with 80+ public-power providers and 30+ cooperatives has a proximity argument worth making to a manufacturer choosing between sites. The checkable demand-side evidence is a named utility or cooperative with a forecast purchase volume and a procurement calendar.
What the comparators leave open
Five comparators ground this map in disclosed project data, and they also mark the edges of what is knowable from public records. Actual peak electrical demand is disclosed by nobody in any tier, and neither is slab load capacity or the square footage split between testing and production. Crane capacity appears only twice: PTT's 60-ton system and the Prince George building's 10-ton and 2-ton units. Qualification timelines from occupancy to first customer-accepted shipment are company schedules. None of them has been verified against a delivered order.
These gaps are what a director asks the prospect in the first substantive conversation. The thresholds above tell you whether your city belongs in that conversation at all. Only the prospect's answers will tell you whether the project fits your site.
- DOE's $375 million program: DOE's Office of Electricity announced plans for a supply-chain program covering transformers, components, refurbishment, and standardization, but the reviewed sources do not yet establish a solicitation, eligible applicants, matching requirements, or application timeline.
- Weirton's collapsed transformer project: Cleveland-Cliffs' abandoned $150 million transformer-core plant — confirmed in an April 2026 SEC filing disclosing the decision not to develop and the site's listing for sale — is a primary-source case showing that an incentive package, available building, and announced workforce plan do not establish execution.
- Subcomponent bottlenecks persist: A Prolec GE representative told DOE's March 2026 webinar that while distribution-transformer lead times had normalized, secondary breakers, specialty switches, fuses, and arresters remained constrained — a reminder that component-level shortages can persist inside an improving headline.
- FERC's large-load reliability order: FERC's July 2026 Order RD26-7-000 directed NERC to submit new reliability standards addressing large computational loads by December 31, 2026, formalizing data-center demand as a grid-planning subject with potential downstream effects on equipment procurement timelines.