Elprom Heavy Industries
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.
- Company typePrivate
- Founded1949
- HeadquartersSofia, Bulgaria
- Headcount101–250
- GTM typeB2B
- OfferingHardware or Manufacturing
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.
Elprom Heavy Industries firmographics
Firmographics- 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
Elprom Heavy Industries industry classification
Industry- 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
Where Elprom Heavy Industries is headquartered
LocationHeadquarters
- HQ city
- Sofia
- HQ country
- Bulgaria
- HQ region
- Europe
Offices1 record
Markets served
Elprom Heavy Industries business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Personnel, Operations, Infrastructure, Technology or R&D
Revenue model
- 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.
- 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.
- Transport and Logistics Services: End-to-end transport and logistics management for transformers including road, rail, and sea delivery to installation sites worldwide.
- 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
Elprom Heavy Industries product offering
Product offeringCore 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
Companies that use Elprom Heavy Industries
Customer profileNamed customers3 records
Segments3 records
Ideal customer profiles3 records
Elprom Heavy Industries technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
Elprom Heavy Industries partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered core and strategic.
- ETD TransformátorycoreJoint 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.
- VOLTAPcoreVOLTAP 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 MRstrategicLong-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 EnergystrategicLong-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
Elprom Heavy Industries competitors and assessment
Company assessmentBroad 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
Elprom Heavy Industries social profiles
Digital presenceElprom Heavy Industries compliance and trust
Trust signalCompliance6 records
Elprom Heavy Industries financial estimates
Financial estimateRevenue estimate
Valuation estimate
Elprom Heavy Industries leadership team
Management profileNumber of profiles
Profiles1 record
Elprom Heavy Industries funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Elprom Heavy Industries M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Elprom Heavy Industries
What does Elprom Heavy Industries do?
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.
Is Elprom Heavy Industries a public or private company?
Elprom Heavy Industries is a private company. It is classified as corporate owned and is currently operating.
When was Elprom Heavy Industries founded?
Elprom Heavy Industries was founded in 1949. It employs 101 to 250 people.
Where is Elprom Heavy Industries based?
Elprom Heavy Industries is headquartered in Sofia, Bulgaria, in the Europe region.
How does Elprom Heavy Industries make money?
Four revenue lines are on record. Power Transformer Sales are the primary driver. The others are after-Sales Service and Support, transport and Logistics Services and laboratory Testing Services.
Who are Elprom Heavy Industries's main competitors?
Broad incumbents on record are GE Vernova, Hyundai Electric, Hitachi Energy, Toshiba Energy Systems & Solutions and Siemens Energy. Elsewedy Electric is listed as a regional player. Direct peers are CG Power & Industrial Solutions, TBEA, BEZ Transformatory and ETD Transformátory.
Does Elprom Heavy Industries have an API?
No public API is recorded for Elprom Heavy Industries.
What industry is Elprom Heavy Industries in?
Elprom Heavy Industries's product category is Power Transformers. Its primary akta.pro industry code is IMAGAAAA, Transformers (Power, Distribution, Instrument, Specialty). Its NAICS code is 335311 and its SIC code is 3612.