Elprom Heavy Industries

What Elprom Heavy Industries does

Elprom Heavy Industries is a privately held Bulgarian manufacturer of power transformers, headquartered in Sofia and operating since 1949 as a subsidiary of BEZ Transformatory (Slovakia) since 2020. The company designs and produces custom-engineered single-phase, three-phase, autotransformers, generator transformers, and special transformers rated up to 250 MVA and 420 kV, utilizing a Dynamic Design System for electrodynamic short-circuit, leakage flux, and thermal-rise analysis, alongside advanced core construction using low-loss cold-rolled grain-oriented silicon steel and C5M-grade tank coatings for harsh environments. Production is vertically integrated on a single site, covering core and coils, metal welding, active parts assembly, and an ISO/IEC 17025 accredited in-house testing laboratory capable of 50 Hz, 60 Hz, and 200 Hz testing.

The company serves utilities, grid operators, and renewable-energy developers across more than 85 countries, with documented project references in Greek wind, Bulgarian solar, and Georgian electricity distribution. Revenue is generated through one-time capital-equipment sales of custom-engineered units, supplemented by professional-service revenue streams including after-sales support, transport and logistics, and accredited laboratory testing. The business is certified under ISO 9001:2015, 14001:2018, 45001:2018, 3834-2:2021 and received an EcoVadis Bronze medal in April 2026.

Go-to-market is enterprise field sales through department-specific contact channels (Transformers, After Sales, Quality Assurance), direct inquiry via the corporate website, and relationship-based selling supplemented by trade-fair presence at major European energy events. Strategic component partners include VOLTAP, Reinhausen MR, and Hitachi Energy for on-load tap changers, and the company jointly exhibits with sister company ETD Transformátory (Czech Republic) to address European renewable-energy customers. Pricing is project-specific and not publicly disclosed.

Name

Elprom Heavy Industries

Legal name

Elprom Heavy Industries

Website

https://elpromgroup.com

Company type

Private

Founded year

1949

Operating status

Operating

Headcount range

101–250 employees

Short description

Elprom Heavy Industries is a Bulgarian power-transformer manufacturer (founded 1949, 103 employees) that designs and produces custom-engineered units up to 250 MVA and 420 kV for utilities, grid operators, and renewable-energy developers across more than 85 countries.

Ownership category

akta.pro rank

Product category

Power Transformers

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311)

SIC

Power, Distribution & Specialty Transformers (3612), Electronic Coils, Transformers & Other Inductors (3677)

akta.pro primary industry

Transformers (Power, Distribution, Instrument, Specialty) (IMAGAAAA)

Keywords

• Power transformers
• Transformer manufacturing
• High voltage equipment
• Grid infrastructure
• Substation transformers

Headquarters

HQ city

Sofia

HQ country

Bulgaria

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Infrastructure, Technology or R&D

Revenue model

1. Power Transformer Sales: Custom-engineered and high-performance power transformers sold as one-time capital equipment purchases. Products include single-phase transformers, three-phase transformers, autotransformers, generator transformers and special transformers up to 250 MVA and 420 kV.
2. After-Sales Service and Support: Technical support during installation and commissioning, ongoing maintenance guidance, fast-response troubleshooting, availability of spare parts and retrofit solutions, expert advice long after delivery. Field service engineers provide hands-on expertise.
3. Transport and Logistics Services: End-to-end transport and logistics management for transformers including road, rail, and sea delivery to installation sites worldwide.
4. Laboratory Testing Services: In-house accredited testing laboratory providing routine testing per IEC 60076 standards. Special tests available through internationally accredited independent laboratories such as KEMA (Netherlands) and CESI (Italy) upon client request.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

Elprom Heavy Industries manufactures custom-engineered power transformers (single-phase, three-phase, autotransformers, generator, and special transformers) rated up to 250 MVA and 420 kV. The company delivers a full-cycle offering spanning in-house design, core/coils production, tank fabrication, assembly, accredited testing, transport logistics, and after-sales support from quotation through energization, primarily for utilities, grid operators, and renewable energy developers worldwide.

Product overview

Elprom Heavy Industries offers a unified portfolio of power transformer products complemented by comprehensive service modules. The core product line includes Single-phase Power Transformers, Three-phase Transformers, Autotransformers, Generator Transformers, and Special Transformers, all rated up to 250 MVA and up to 420 kV. The company provides an integrated full-cycle service ecosystem comprising Design and Production Services, Quality Assurance Services, Transport and Logistics Services, and After-sales Service, enabling delivery from quotation to energization. The offering is enhanced by an in-house accredited Transformer Testing Laboratory and utilizes third-party tap changer components from VOLTAP (a long-term partner alongside Reinhausen MR and Hitachi Energy).

Differentiator

Problem solved

Functional benefit

Products and services

• Single-phase Power Transformers Power transformers rated up to 250 MVA and up to 420 kV, designed for single-phase electrical systems. Sold to utilities, grid operators, and energy developers worldwide.
• Three-phase Transformers Power transformers rated up to 250 MVA and up to 420 kV, designed for three-phase electrical systems. Sold to utilities, grid operators, and energy developers worldwide.
• Autotransformers Power transformers rated up to 250 MVA and up to 420 kV, designed with autotransformer configuration for efficient power transmission. Sold to utilities and grid operators for high-voltage transmission applications.
• Generator Transformers Specialized power transformers rated up to 250 MVA and up to 420 kV, designed to connect generators to the electrical grid. Used by power generation operators and renewable energy developers.
• Special Transformers Custom-engineered power transformers rated up to 250 MVA and up to 420 kV for specialized industrial applications. Sold to industrial and utility customers with unique specification requirements.
• Transport and Logistics Services End-to-end transport and logistics management including road, rail, and sea shipping, ensuring safe delivery of power transformers directly to installation sites worldwide.
• After-Sales Service and Support Comprehensive after-sales support covering technical assistance during installation and commissioning, ongoing maintenance guidance, fast-response troubleshooting, spare parts availability, retrofit solutions, and hands-on field service engineers.
• Transformer Testing Laboratory Services Accredited transformers test laboratory (ISO/IEC 17025, Certificate No. 234/29.07.2022) performing type, routine, and special tests on power transformers and tap changers, including lightning impulse tests, partial discharge measurements, heat run tests, and SFRA.

Quantifiable outcome

• Thousands of transformers delivered worldwide with proven reliability
• +2 more outcomes

Named customers3 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Four partnerships are on record, tiered core and strategic.

• ETD TransformátorycoreStrategic or Co-development Partner · 1 June 2026Joint exhibition partnership at Intersolar Europe 2026 at Messe München. ETD Transformátory (Czech Republic, founded 1921 as Škoda Works) and Elprom Heavy Industries are co-exhibiting to present combined expertise in power transformer manufacturing. Both companies are EU-based manufacturers serving utilities, grid operators, and energy developers across Europe and globally.
• VOLTAPcoreTechnology or IntegrationVOLTAP is a tap changer manufacturer with over 70 years of experience. Elprom Heavy Industries offers the opportunity to use own de-energized and/or on-load tap changers, with VOLTAP products featured as standard offerings. Products include unique designs for special applications, powerful tap changers for powerful transformers, universal tap changers for all applications, and compact light designs.
• Reinhausen MRstrategicTechnology or IntegrationLong-term tap changer partner offering on-load tap changers (OLTC) as part of transformer solutions. Mentioned alongside VOLTAP and Hitachi Energy as partner options for tap changer solutions.
• Hitachi EnergystrategicTechnology or IntegrationLong-term tap changer partner mentioned alongside Reinhausen MR and VOLTAP as partner options for on-load tap changer solutions in transformer products.

Scale indicators5 records

Recent moves12 records

Expansion highlights5 records

Broad incumbents

• GE Vernova: Major Western OEM of power transformers and grid equipment, serving utilities and renewable developers globally. Competes with Elprom on large transmission-class transformer deals, with deeper balance sheet and broader portfolio across the grid stack.
• Hyundai Electric: Korean power transformer and switchgear manufacturer and the former corporate parent of Elprom (privatized Elprom in 1997). Direct product overlap in large power transformers and shared history of technology transfer.
• Hitachi Energy: Global market leader in power transformers (legacy ABB Power Grids), serving utilities and renewables at scale up to 1,200 kV. Elprom explicitly lists Hitachi Energy as a long-term OLTC partner, confirming direct overlap in product category and customer base across the full voltage range.
• Toshiba Energy Systems & Solutions: Established Japanese manufacturer of large power transformers with global utility customer base. Competes in the same high-voltage transformer category and shares exposure to Asian and EMEA utility tenders.
• Siemens Energy: Tier 1 European-headquartered transformer OEM with broad grid solutions portfolio including power transformers up to 1,200 kV. Competes for the same European utility tenders Elprom targets, but at much larger scale and with broader grid-adjacent offerings.

Regional players

• Elsewedy Electric: Egyptian-headquartered power transformer and cable manufacturer with strong MENA and Africa footprint. Comparable product range in power transformers but primarily serves a different geographic customer base than Elprom's European core.

Direct peers

• CG Power & Industrial Solutions: Indian manufacturer of power and distribution transformers serving utilities and renewables globally. Comparable in scale and product mix to Elprom and competes in similar EMEA and emerging-market utility tenders.
• TBEA: One of the world's largest transformer manufacturers, producing power and special transformers up to 1,000 kV with strong presence in EMEA tenders. Competes head-to-head with Elprom in wind/solar interconnection projects.
• BEZ Transformatory: Slovak parent of Elprom Heavy Industries (acquired 2020) and itself a manufacturer of power and distribution transformers. Direct strategic and operational peer — same product family, same end-markets, and provides a clear template for how Elprom is positioned within the group.
• ETD Transformátory: Czech power transformer manufacturer founded in 1921 (Škoda Works heritage) and a strategic partner of Elprom — they co-exhibit at Intersolar Europe 2026 and share parent-group ties through BEZ Transformatory. Highly comparable product scope (medium- and high-voltage power transformers) and identical customer base in European utilities and renewables.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/elprom-heavy-industries-co-bulgaria

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Elprom Heavy Industries