Interenergo
Interenergo is the regional operating brand of Kelag International (Kelag Group subsidiary) that invests in, builds, and operates solar, wind, and hydro assets and trades electricity across 15+ European wholesale markets, while delivering PPAs, energy contracting, and Guarantees of Origin to developers, industry, and public sector clients across 14 European markets.
- Company typePrivate
- Founded1923
- HeadquartersLjubljana, Slovenia
- Headcount11–50
- GTM typeB2B
- OfferingServices
What Interenergo does
Interenergo is a regional operating brand within Kelag International, itself a wholly-owned subsidiary of the Austrian Kelag Group (founded 1923, 100th anniversary celebrated in 2023). The company invests in, constructs, and operates renewable energy generation facilities — spanning solar, wind, and hydro technologies — and concurrently runs an energy-trading desk active on more than 15 European wholesale electricity markets. Its operating footprint is built around 12 subsidiary offices covering 14 European markets in the Iberian, Mediterranean, and South-East Europe regions, with the legal entity headquartered in Klagenfurt, Austria, and the Interenergo brand historically anchored in Ljubljana, Slovenia. Stated group-level production capacity is 1,400+ MW across the wider Kelag Group.
The commercial offering sits in three connected layers. The first is renewable generation, where Interenergo/Kelag International develops, builds, and operates solar, wind, and hydro assets; examples include the Jasenice wind-and-solar synergy project near Zadar, Croatia. The second is energy trading, where the firm buys and sells short- and long-term electricity across European wholesale exchanges, generating revenue through trading margins and market participation. The third is energy solutions, comprising energy contracting (long-term efficiency and supply arrangements for industry and public sector), Power Purchase Agreements (PPAs) structuring and delivery, and Guarantees of Origin (GOO) certification that validates renewable sourcing for energy consumers.
The business model is a mix of capital-intensive generation, transaction-based trading, recurring PPA/contracting fees, and licensing-style GOO revenue. Go-to-market is direct enterprise field sales targeting six customer segments — Developers, Land Owners, Power Producers, RES Investors, Industry, and Public Sector — with project-specific, quote-based pricing and no public pricing tiers. The firm is privately held, has a stated headcount of 11-50, and was consolidated in 2023 under the Tessera unified brand for European renewable-energy partnerships, subsuming the Interenergo brand identity.
Interenergo firmographics
Firmographics- Name
- Interenergo
- Legal name
- Kelag International
- Website
- https://interenergo.com
- Company type
- Private
- Founded year
- 1923
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Interenergo is the regional operating brand of Kelag International (Kelag Group subsidiary) that invests in, builds, and operates solar, wind, and hydro assets and trades electricity across 15+ European wholesale markets, while delivering PPAs, energy contracting, and Guarantees of Origin to developers, industry, and public sector clients across 14 European markets.
- Ownership category
- akta.pro rank
Interenergo industry classification
Industry- Product category
- Renewable Energy Services
- NAICS
- Electric Power Generation (22111), Wind Electric Power Generation (221115), Solar Electric Power Generation (221114), Hydroelectric Power Generation (221111)
- SIC
- Cogeneration Services & Small Power Producers (4991)
- akta.pro primary industry
- Wholesale Renewable Power Trading (Day-Ahead, Intraday, Bilateral) (EUAMAMAA)
- akta.pro secondary industries
- Renewable Energy Infrastructure (FSAAAKAG), Wholesale Energy Brokerage & Intermediation (EUAGAAAM), Energy & Renewables Specialty Contracting (Solar PV, Storage, EV Charging) (IMAFALAJ)
Keywords
Where Interenergo is headquartered
LocationHeadquarters
- HQ city
- Ljubljana
- HQ country
- Slovenia
- HQ region
- Europe
Offices12 records
Markets served
Interenergo business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Infrastructure, Operations, Personnel, Supply Chain, Technology or R&D
Revenue model
- Renewable Energy Production: Generation and sale of electricity from renewable sources including solar, wind, and hydro power facilities. Revenue derived from electricity sales to wholesale markets and through PPAs.
- Energy Trading: Short and long-term electricity trading across more than 15 European wholesale markets. Revenue generated through trading margins and market participation.
- Energy Contracting: Energy contracting solutions provided to industry and public sector clients. Services include energy efficiency projects and long-term energy management partnerships.
- Power Purchase Agreements: PPA structuring and management for power producers and energy buyers, providing long-term revenue visibility for renewable projects.
- Guarantees of Origin: Issuance and management of guarantees of origin certificates for renewable energy, enabling energy consumers to verify renewable sourcing.
Go-to-market motion1 record
Distribution channels3 records
Marketing channels4 records
Interenergo product offering
Product offeringCore offering
Interenergo invests in, constructs, and manages solar, wind, and hydro renewable energy facilities across 14 European markets. The company also conducts short and long-term electricity trading across 15+ European wholesale markets, and delivers energy solutions including energy contracting, Power Purchase Agreements (PPAs), and Guarantees of Origin (GOO) certification to industry and public sector clients.
Product overview
Kelag International operates as an integrated renewable energy services platform offering a comprehensive value chain of solutions across the Iberian, Mediterranean, and South-East European regions. The portfolio centers on three core areas: Renewable Energy production (spanning solar, wind, and hydro technologies), Energy Trading across 15+ European wholesale markets, and Energy Solutions including Energy Contracting, Power Purchase Agreements (PPA), and Guarantees of Origin (GOO). The platform provides tailored solutions for distinct customer segments including Developers, Land Owners, Power Producers, RES Investors, Industry, and Public Sector clients. The company, part of the Austrian Kelag Group with over 100 years of tradition, manages more than 1,400 MW of total rated power across 14 European markets.
Differentiator
Problem solved
Functional benefit
Brands
- Tessera: Unified brand for stronger European renewable energy partnerships, consolidating operations including former Interenergo brand
Products and services
- Renewable Energy Production Investment in, construction of, and management of facilities for the production of energy from renewable sources including solar, wind, and hydro power technologies. Targeted at developers, power producers, RES investors, and partners across 14 European markets.
- Energy Trading Short and long-term electricity trading across more than 15 European wholesale markets. Targeted at power producers and energy market participants seeking market access and trading margins.
- Energy Contracting Energy solutions providing reliable energy services for industry and public sector clients. Services include energy efficiency projects and long-term energy management partnerships. Targeted at industrial companies and public sector organizations.
- Power Purchase Agreements (PPA) Long-term energy purchase agreements structuring renewable energy procurement between power producers and energy buyers. Provides long-term revenue visibility for renewable projects. Targeted at power producers, industry clients, and public sector organizations.
- Guarantees of Origin (GOO) Certification service that manages and issues guarantees of origin for renewable energy, enabling energy consumers to verify renewable sourcing and meet sustainability reporting requirements. Targeted at industry clients and energy consumers.
- Solutions for Developers Renewable energy development solutions and support services for project developers, including project development, permitting support, land acquisition, and construction management. Targeted at renewable energy developers.
- Solutions for Land Owners Services enabling land owners to participate in renewable energy projects on their properties through land lease agreements, hosting arrangements, and community benefits. Targeted at property and land owners.
- Solutions for Power Producers Comprehensive value chain services for renewable energy power producers, including PPA structuring, GOO certification, energy trading, and operational support. Targeted at renewable power producers.
- Solutions for RES Investors Investment solutions and support for renewable energy source investments, including investment structuring, project financing, and co-investment opportunities. Targeted at RES investors.
- Solutions for Industry Tailored renewable energy solutions for industrial sector clients, including energy contracting, PPA procurement, GOO acquisition, and sustainability reporting. Targeted at industrial and manufacturing companies.
- Solutions for Public Sector Energy solutions designed for public sector organizations and government entities, including public sector energy solutions, green energy procurement, and sustainability mandates. Targeted at government and public institutions.
Quantifiable outcome
- 1,400+ MW of total rated power of production units through Kelag Group
- +1 more outcomes
Companies that use Interenergo
Customer profileNamed customers2 records
Segments6 records
Ideal customer profiles6 records
Interenergo technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
Interenergo partnerships and signals
Strategic signalPartnerships
Two partnerships are on record, tiered core and minor.
- ElancoreLong-term partnership established in 2018 with Elan, a manufacturing company. Initial project involved renovation of lighting in one of Elan's production halls. Partnership has successfully completed eight energy-efficient projects to date, supporting Elan's green transition objectives.
- Secondary School of Economics, Services, and Construction of the Kranj School CenterminorEducational partnership implementing the project 'Foundations of a Green Future' to educate students on efficient energy use. Project received recognition and award from the school.
Scale indicators5 records
Recent moves6 records
Expansion highlights5 records
Interenergo competitors and assessment
Company assessmentRegional players
- Verbund AG: Austrian-headquartered hydroelectric and renewable utility with strong SEE and Alpine footprint; while much larger, it is the closest regional Austrian/SEE utility peer to Interenergo's home market and operating geography.
Direct peers
- Sonnedix: Pan-European solar IPP that develops, acquires, and operates distributed and utility-scale renewable assets across multiple European jurisdictions, providing a directly comparable multi-country IPP-only focus.
- PNE AG: German wind and solar project developer with European operations, Power Purchase Agreement origination, and energy trading exposure, closely matching Interenergo's combination of development pipeline and market-access services.
- BayWa r.e. German-headquartered renewable energy developer, trader, and energy-services provider active across European markets, combining IPP assets, PPA origination, and wholesale energy trading — the closest analog to Interenergo's integrated renewable+trading+services model.
- Encavis AG: European solar and wind IPP that owns and operates a multi-market renewable generation portfolio and sells power via PPAs and merchant routes, mirroring Interenergo's IPP-and-market-access positioning at similar mid-cap scale.
- Eolus Vind: Swedish wind and solar developer and asset owner active across Northern and Southern European markets, comparable as a multi-jurisdictional European renewable developer with PPA-driven business model.
Broad incumbents
- EDP Renováveis (EDPR): Largest Iberian-origin renewable utility and one of the world's top wind/solar developers; overpowers Interenergo in Iberia but competes head-on for Mediterranean and SEE project rights.
- RWE Renewables: European renewable utility arm of RWE with utility-scale wind, solar, and battery development plus trading operations; a scaled incumbent whose Iberian, Italian, and SEE pipeline competes with Interenergo for industrial PPAs.
- Statkraft: Norwegian state-owned utility and Europe's largest renewable power generator, with a major wholesale trading desk across European exchanges — a scaled incumbent in the same renewable-generation-and-trading intersection Interenergo targets.
Emerging players
- Econergy Renewable Energy: Israel-origin, European-focused renewable developer building wind, solar, and storage pipelines across SEE and the Mediterranean — emerging competitor chasing similar offtake opportunities in adjacent geographies.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Interenergo social profiles
Digital presenceInterenergo financial estimates
Financial estimateRevenue estimate
Valuation estimate
Interenergo leadership team
Management profileNumber of profiles
Interenergo subsidiaries and ownership
Company hierarchySubsidiaries1 record
Interenergo funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Interenergo 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 Interenergo
What does Interenergo do?
Interenergo invests in, constructs, and manages solar, wind, and hydro renewable energy facilities across 14 European markets. The company also conducts short and long-term electricity trading across 15+ European wholesale markets, and delivers energy solutions including energy contracting, Power Purchase Agreements (PPAs), and Guarantees of Origin (GOO) certification to industry and public sector clients.
Is Interenergo a public or private company?
Interenergo is a private company. It is classified as corporate owned and is currently operating.
When was Interenergo founded?
Interenergo was founded in 1923. It employs 11 to 50 people.
Where is Interenergo based?
Interenergo is headquartered in Ljubljana, Slovenia, in the Europe region.
How does Interenergo make money?
Five revenue lines are on record. Renewable Energy Production is the primary driver. The others are energy Trading, energy Contracting, power Purchase Agreements and guarantees of Origin.
Who are Interenergo's main competitors?
Verbund AG is listed as a regional player. Direct peers are Sonnedix, PNE AG, BayWa r.e., Encavis AG and Eolus Vind. Broad incumbents are EDP Renováveis (EDPR), RWE Renewables and Statkraft. Econergy Renewable Energy is listed as an emerging player.
Does Interenergo have an API?
No public API is recorded for Interenergo.
What industry is Interenergo in?
Interenergo's product category is Renewable Energy Services. Its primary akta.pro industry code is EUAMAMAA, Wholesale Renewable Power Trading (Day-Ahead, Intraday, Bilateral), with a secondary code of FSAAAKAG, Renewable Energy Infrastructure. Its NAICS code is 22111 and its SIC code is 4991.