Slovenska Elektrizacna Prenosova Sustava

What Slovenska Elektrizacna Prenosova Sustava does

Slovenská elektrizačná prenosová sústava, a.s. (SEPS) is Slovakia's sole designated electricity transmission system operator (TSO), operating as a regulated natural monopoly under the Energy Act (zákon č. 251/2012 Z. z.) and 100% owned by the Slovak Republic through the Ministry of Finance. Established on January 21, 2002 as a spin-off from Slovenské elektrárne, the company operates and maintains approximately 3,047 km of high-voltage transmission infrastructure (2,357 km at 400 kV and 690 km at 220 kV) across 22 electrical substations and 7,000+ transmission towers, with 12 cross-border interconnectors linking Slovakia to all neighbors except Austria. The national dispatching center (SED) in Žilina, operational since October 2005, performs real-time grid balancing, frequency regulation (target 50 Hz, limits 49.8–50.2 Hz), and cross-border coordination via SCADA/EMS systems and the proprietary Damas Energy information platform.

SEPS's service portfolio spans electricity transmission, cross-border capacity allocation via annual/monthly/daily auctions, ancillary services procurement (FCR, aFRR, mFRR) coordinated through European platforms (PICASSO, MARI, IGCC), and market coupling via SDAC and IDCC(d). It also implements the EU co-financed Danube InGrid PCI smart grid project in partnership with Slovak DSOs and Hungarian counterparts. Revenue is generated entirely from regulated tariffs (system services tariff, transmission tariff, ancillary services procurement costs) approved by ÚRSO, with FY2025 total revenues of €476.15M and net profit of €55.82M.

SEPS serves three regional distribution system operators (ZSD, SSD, VSD), large industrial direct consumers including U.S. Steel Košice and Duslo Šaľa, power plant operators, ancillary services providers, and electricity market participants trading on Slovak and European markets. As a member of ENTSO-E since 2004, SEPS participates in pan-European market coupling and balancing cooperation. The company does not engage in commercial sales; all customer relationships are governed by regulated agreements, public consultations, and statutory obligations.

Name

Slovenska Elektrizacna Prenosova Sustava

Legal name

Slovenská elektrizačná prenosová sústava, a.s.

Website

https://sepsas.sk

Company type

Private

Founded year

2002

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Slovenská elektrizačná prenosová sústava is Slovakia's state-owned, sole designated electricity transmission system operator, managing 3,047 km of 400/220 kV lines, 22 substations, and a national dispatching center. It serves three regional DSOs, large industrial consumers, and power generators under regulated tariffs set by ÚRSO.

Ownership category

akta.pro rank

Product category

Electricity Transmission Services

NAICS

Electric Power Generation, Transmission and Distribution (2211), Electric Bulk Power Transmission and Control (221121), Electric Power Transmission, Control, and Distribution (22112)

SIC

Electric Services (4911)

akta.pro primary industry

National & Regional TSOs (ISO/RTO/Grid Operators) (EUADAAAA)

akta.pro secondary industries

Cross-Border Interconnectors & Regional Transmission Coordination (EUADAAAB), HVAC Transmission Lines (EHV/UHV Overhead & Underground) (EUADAAAD), Transmission Reliability, Resilience & Emergency Restoration (NERC/ENTSO-E Compliance) (EUADAAAO), Circuit Breakers, Disconnectors, Earthing Switches & Switchgear Components (EUADACAH)

Keywords

• Electricity transmission
• Transmission system operator
• Grid balancing services
• Ancillary services procurement
• Cross-border capacity allocation

Headquarters

HQ city

Bratislava

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. System Services Tariff (Tarifa za systémové služby): Revenue from regulated tariffs charged to electricity market participants for system services, including ancillary services procurement, frequency regulation, and grid balancing. Costs are regulated by ÚRSO (Úrad pre reguláciu sieťových odvetví). The approved cost for ancillary services for 2023 was 322,740,030.84 EUR. SEPS procures ancillary services from providers via annual, daily, and mid-term tender procedures.
2. Transmission Tariffs: Regulated revenue from electricity transmission tariffs, covering the operation and maintenance of 400 kV and 220 kV transmission infrastructure, cross-border capacity allocation, and loss compensation.
3. Ancillary Services Procurement and Resale: SEPS procures ancillary services (podporné služby) from certified providers (power plants, industrial consumers, battery storage) through competitive tendering and resells the balancing capacity to the market. Procurement rules and costs are approved by ÚRSO.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

SEPS is the sole designated transmission system operator (TSO) of Slovakia, transmitting electricity across roughly 3,047 km of 400 kV and 220 kV high-voltage lines and 22 substations from generators to distribution networks and large industrial consumers. It operates the national dispatching center, procures ancillary services, manages real-time grid balancing, and allocates cross-border capacity.

Product overview

SEPS operates as Slovakia's electricity transmission system operator, providing a unified portfolio of services centered on high-voltage electricity transmission (400 kV and 220 kV lines spanning over 3,000 km) and system operations. The core offering includes capacity auctions via the Damas Energy platform, ancillary services procurement (FCR, aFRR, mFRR) coordinated through PICASSO and MARI platforms, and market coupling mechanisms (SDAC Flow-Based, IDCC(d)). Supporting services include dispatching operations, international grid cooperation (IGCC), energy data management, and REMIT compliance reporting. The Danube InGrid project represents a major infrastructure modernization initiative. The company does not offer a traditional SaaS product but rather operates critical energy infrastructure services.

Differentiator

Problem solved

Functional benefit

Products and services

• Prenos elektriny (Electricity Transmission) SEPS's core service: transmission of electricity across Slovakia via 400 kV and 220 kV high-voltage power lines, ensuring reliable delivery from generation facilities to distribution networks and large industrial consumers.
• Aukcie (Capacity Auctions) Auction services for cross-border capacity allocation on Slovak borders with the Czech Republic, Poland, Hungary, and Ukraine, including annual, monthly, and daily auction products for SK/CZ, SK/PL, SK/HU, and SK/UA profiles.
• Damas Energy Web-based information system for energy market participants providing registration, user account management, scheduling services, and contract transfer functionalities for balancing and ancillary services procurement.
• Podporné služby (Ancillary Services) Procurement and management of balancing and ancillary services including Frequency Containment Reserve (FCR), automatic and manual frequency restoration reserves, and replacement reserves to maintain grid stability and system balance.
• Dispečing (Dispatching Services) Real-time grid management and dispatching services including operational planning, outage scheduling, daily operation data, and annual energy statistics (Ročenky SED) for system balancing.
• Flow-Based Market Coupling Day-ahead market coupling mechanism (Single Day-Ahead Coupling) using flow-based methodology for coordinated capacity calculation across the Core capacity calculation region, optimizing cross-border trade and social welfare.
• Core Flow-Based Intraday Capacity Calculation (IDCC(d)) Intraday capacity calculation system providing updated cross-border transmission capacities throughout the trading day using flow-based methodology for the Core region, delivering intraday capacities by 09:45.
• ITC / CBT Inter-TSO Compensation and Cross-Border Trade services for managing international electricity exchanges and compensating for transit flows.
• REMIT Market integrity and transparency services compliant with EU Regulation on Energy Market Integrity and Transparency (REMIT), including data reporting and market surveillance.

Quantifiable outcome

• Zero blackouts recorded in Slovakia's history (as of 2023)
• +3 more outcomes

Named customers7 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability2 records

Feature3 records

Partnerships

14 partnerships are on record, tiered core and minor.

• AI.grids Initiative PartnerscoreStrategic or Co-development Partner · 18 June 2026SEPS joined a European initiative to create a common AI model for the power transmission sector. The initiative aims to establish a shared European technological, data, and methodological foundation for future AI use in transmission grid operations, market optimization, and system stability. Multiple European energy companies and organizations participate.
• Vodohospodárska výstavba, š. p.coreStrategic or Co-development Partner · 14 May 2022State-owned water management enterprise operating the Danube hydropower cascade including Gabčíkovo HPP. Provided the restoration power source for the 2022 island operation/blackout restoration test conducted by SEPS in cooperation with ZSD.
• Stredoslovenská distribučná, a.s. (SSD)minorStrategic or Co-development Partner · 14 May 2022SSD is the central Slovak DSO and cooperates with SEPS in grid operations, dispatching coordination, and island testing scenarios (e.g., 2026 Váh River cascade island test on northern Považie).
• Východoslovenská distribučná, a.s. (VSD)coreStrategic or Co-development Partner · 1 January 2022VSD is the eastern Slovak DSO and partner in Danube InGrid Wave 2 (from 2022). The collaboration focuses on eastern Slovakia, addressing reactive power flows from the distribution to transmission system, modernizing secondary systems, and deploying digital switchgear.
• ELMŰ Hálózati Kft. (Hungary)coreStrategic or Co-development Partner · 1 January 2022Hungarian distribution company participating in Danube InGrid Wave 2 (eastern/central Hungary), collaborating with SEPS and VSD on smart grid development and transmission-distribution coordination.
• Émász Hálózati Kft. (Hungary)coreStrategic or Co-development Partner · 1 January 2022Hungarian distribution company (MVM ÉMÁSZ Áramhálózati Kft.) participating in Danube InGrid Wave 2, cooperating with SEPS and VSD on northeastern Hungary / eastern Slovakia smart grid corridor.
• MAVIR ZRt. (Hungarian Transmission System Operator)coreStrategic or Co-development Partner · 5 April 2021MAVIR is the Hungarian TSO and key cross-border partner. SEPS and MAVIR jointly launched two new 400 kV cross-border interconnections (Gabčíkovo–Gönyű–Veľký Ďur and Rimavská Sobota–Sajóivánka) into commercial operation on April 5, 2021. Both projects were designated as PCI (Projects of Common Interest) by the European Commission and co-financed by the Connecting Europe Facility. The projects significantly increased cross-border transmission capacity between Slovakia and Hungary.
• Západoslovenská distribučná, a.s. (ZSD)coreStrategic or Co-development Partner · 1 January 2019ZSD is the western Slovak DSO and a key partner in the Danube InGrid PCI project (Wave 1). SEPS and ZSD are jointly implementing smart grid modernization in the Bratislava region, including construction of a new substation in Vajnory (400/110 kV transformation), and modernization of substations in Stupava and Podunajské Biskupice. ZSD also cooperated in the 2022 blackout restoration test using the Gabčíkovo–Bohunice route.
• E.ON Észak-dunántúli Áramhálózati Zrt. (Hungary)coreStrategic or Co-development Partner · 1 January 2019Hungarian distribution company and Danube InGrid partner (Slovakia-Hungary smart grid project, Wave 1). Cooperating with SEPS and ZSD on smart grid modernization in the northwest Hungary / western Slovakia corridor.
• ENTSO-E (European Network of Transmission System Operators for Electricity)coreStrategic or Co-development Partner · 29 June 2004SEPS is a member of ENTSO-E (accepted June 29, 2004). ENTSO-E coordinates cross-border TSO cooperation, develops European grid development plans (Ten-Year Network Development Plan, TYNDP), and implements market coupling mechanisms. SEPS participates in ENTSO-E working groups, regional initiatives (PICASSO, MARI for balancing, CORE CC for capacity calculation), and FCR cooperation.
• Slovenské elektrárne, a.s. (SE)coreStrategic or Co-development PartnerSlovenské elektrárne (SE) is the largest Slovak power generation company. SEPS cooperates with SE on grid operations including blackout prevention and restoration testing. SE provides generation capacity including nuclear (Bohunice V2) and hydropower, which are critical for system balancing and start-from-darkness procedures.
• ACER (Agency for the Cooperation of Energy Regulators)coreStrategic or Co-development PartnerSEPS operates under ACER regulatory oversight and participates in ACER-led capacity calculation region governance (Core CCR). ACER decisions on transmission capacity allocation, market coupling, and grid codes directly affect SEPS operations.
• CIGRE (International Council on Large Electric Systems)minorStrategic or Co-development PartnerSEPS participates in CIGRE (Conseil International des Grands Réseaux Électriques), an international professional association for power system expertise, knowledge sharing, and technical studies.
• Ochrana dravcov na Slovensku (Bird Protection NGO)minorStrategic or Co-development PartnerLong-term environmental partnership for bird protection. SEPS installs nesting boxes (búdky) for the sokol rároh (saker falcon) on transmission towers and installs deflection markers to prevent bird collisions. The saker falcon population in Slovakia grew from 9 to 50 breeding pairs due to these efforts. Also partner in LIFE Danube Free Sky project for reducing bird-tower collisions.

Scale indicators9 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• PSE (Poland): Polish TSO operating a comparable Central European 400/220 kV network; a direct SK/PL border peer with shared ENTSO-E and CORE CCR participation.
• MAVIR (Hungary): Hungarian TSO and SEPS's bilateral partner on the new 2021 SK-HU 400 kV interconnectors and Danube InGrid; same regulatory model under ACER oversight and matched in scale to the Slovak network.
• Swissgrid (Switzerland): Swiss national TSO running a regulated high-voltage transmission monopoly of similar scale; comparable in size, governance (state-backed), and ENTSO-E participation.
• Elering (Estonia): Estonian TSO with a comparable state-owned, regulated national monopoly profile; similar scale and ENTSO-E/Baltic integration, including synchronous-area transition work.
• ČEPS (Czech Republic): Operator of the Czech transmission system and SEPS's closest geographic partner; comparable national TSO role, similar 400/220 kV network, splits from the same parent (ČEZ/Slovenské elektrárne heritage) and co-coordinates on CENTREL legacy.
• Litgrid (Lithuania): Lithuanian TSO operating a smaller national transmission grid; comparable as a small EU TSO with state ownership, ENTSO-E membership, and EU-market coupling participation.
• Transelectrica (Romania): Romanian national TSO operating a regulated 400/220 kV system with ENTSO-E membership; closely comparable in business model, scale and EU regulatory oversight.
• HOPS (Croatia): Croatian national TSO; comparable scale and EU regulatory framework, with similar ACER/ENTSO-E integration and small-market regulated monopoly economics.

Broad incumbents

• 50Hertz Transmission (Germany): One of four German TSOs (Elia group); broader portfolio than SEPS but operates in the same CORE CCR Flow-Based Market Coupling region and on comparable HVDC/HVAC assets.

Regional players

• APG (Austria): Austrian TSO that is the one neighbor SEPS is not interconnected with; comparable regulated TSO role and Central European footprint, but operates in a different synchronous perimeter connectivity situation.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights7 records

Customer concentration

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

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 Slovenska Elektrizacna Prenosova Sustava