OKG

What OKG does

OKG Aktiebolag (Oskarshamns Kraftgrupp) is a Swedish nuclear power operator headquartered in Oskarshamn, established in 1965 and jointly owned by Uniper (54.5%) and Fortum (45.5%) since 2016. The company operates the Oskarshamn energy center on the Simpevarp peninsula, where it currently runs the O3 boiling water reactor at 1,450 MW — Sweden's largest reactor and one of the world's largest BWRs — supplying approximately 12% of Sweden's total electricity production and an amount equivalent to 500,000 homes' annual consumption. Two earlier reactors, O1 (decommissioned 2017) and O2 (decommissioned 2015), are now in large-scale dismantling and demolition, a responsibility that has expanded OKG's mandate from pure generation to full nuclear-lifecycle stewardship.

OKG generates revenue by selling all electricity output wholesale to the Nordic power grid via the Nord Pool exchange at market-determined prices, with additional commercial sales of fossil-free hydrogen produced since 1992 (used partly for generator cooling, with surplus sold to heavy transport and shipping customers). The company procures enriched uranium from URENCO under long-term contracts and operates dedicated training infrastructure, a public visitor center (Elektronen) jointly with SKB, and a mobile app for stakeholders. Decommissioning activities for O1 and O2 are financed through Sweden's Nuclear Waste Fund (KAF) under SSM oversight. OKG is also participating, alongside Uniper, Blykalla, KTH, and ABB, in the development of Small Modular Reactors (SMR) and an electric test reactor on the Simpevarp peninsula, representing its principal forward-looking growth initiative beyond the existing O3 asset.

Name

OKG

Legal name

OKG Aktiebolag

Website

https://okg.se

Company type

Private

Founded year

1965

Operating status

Operating

Headcount range

501–1,000 employees

Short description

OKG is a Swedish nuclear power operator jointly owned by Uniper (54.5%) and Fortum (45.5%), running the 1,450 MW O3 boiling water reactor at Oskarshamn and decommissioning two retired reactors. It sells electricity wholesale via Nord Pool and is developing SMR technology.

Ownership category

akta.pro rank

Product category

Nuclear Power Generation

NAICS

Nuclear Electric Power Generation (221113)

akta.pro primary industry

Boiling Water Reactor (BWR) Power Generation (EUACADAB)

akta.pro secondary industries

Gen IV / Advanced Reactor Systems (SFR, LFR, GFR, MSR, HTGR, Microreactors) (EUAKADAC), Steam Supply System & Turbine Island Interfaces (Steam Generators, Heat Exchangers) (EUAKADAF)

Keywords

• Nuclear power generation
• Wholesale electricity supply
• Fossil-free hydrogen production
• Nuclear decommissioning services
• Small modular reactors

Headquarters

HQ city

Oskarshamn

HQ country

Sweden

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Electricity Production and Sales: OKG generates electricity through its O3 nuclear reactor and sells it to the Nordic power grid via the Nord Pool electricity exchange. The company delivers approximately 10+ billion kilowatt hours annually. Revenue is derived from wholesale electricity sales based on market prices.
2. Hydrogen Sales: OKG has produced fossil-free hydrogen since 1992, primarily for cooling generators. Surplus production is sold commercially for applications in heavy traffic and shipping.
3. Nuclear Decommissioning Services: OKG is responsible for the full nuclear lifecycle including decommissioning of O1 and O2 reactors. Financing is managed through the Nuclear Waste Fund (KAF) according to Swedish regulatory requirements.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels7 records

Core offering

OKG (Oskarshamns Kraftgrupp) operates the Oskarshamn nuclear power plant on the Simpevarp peninsula in Sweden, generating fossil-free baseload electricity from its O3 boiling water reactor (1,450 MW), one of the largest BWRs in the world. The company also produces fossil-free hydrogen as a byproduct for generator cooling and commercial sale, manages decommissioning of retired O1 and O2 reactors, and is developing Small Modular Reactor (SMR) technology in partnership with Uniper, Blykalla, KTH, and ABB.

Product overview

OKG (Oskarshamns Kraftgrupp) is a Swedish nuclear energy company operating the Oskarshamn energy center on the Simpevarp peninsula. The company operates three reactors — O1 (decommissioned 2017), O2 (decommissioned 2015, under demolition), and O3 (currently operating at 1,450 MW). O3 is the flagship product and one of the world's largest boiling water reactors. OKG's portfolio includes fossil-free hydrogen production (since 1992), decommissioning and demolition of retired reactors, and involvement in Small Modular Reactors (SMR) development through partnerships. The company also manages nuclear fuel supply via URENCO, operates a joint visitor center with SKB, provides a mobile app for stakeholders, and delivers comprehensive training programs for staff and contractors through a dedicated training portal.

Differentiator

Problem solved

Functional benefit

Products and services

• Oskarshamn 3 (O3) Nuclear Reactor A 1,450 MW boiling water reactor (BWR) producing baseload electricity equivalent to the annual consumption of roughly half a million Swedish households, sold wholesale into the Nordic grid via Nord Pool.
• Fossil-Free Hydrogen Production Fossil-free hydrogen gas produced since 1992, used for cooling OKG's generators and sold as a commercial product for heavy traffic and shipping applications. Residual product is water (H2O), making it a zero-carbon fuel when consumed.
• Decommissioning and Demolition Services End-to-end decommissioning and dismantling services for the retired O1 and O2 reactors, financed through the Swedish Nuclear Waste Fund (KAF) under SSM oversight.
• Small Modular Reactor (SMR) Development Next-generation Small Modular Reactor (SMR) technology featuring passive safety systems and modular construction, being co-developed with Uniper, Blykalla, KTH, and ABB on the Simpevarp peninsula.
• Nuclear Fuel (Uranium) Supply Enriched uranium procurement and fuel assembly management for OKG's reactors, sourced from URENCO with approved countries of origin including USA, Australia, Canada, Kazakhstan, and Uzbekistan.

Quantifiable outcome

• O3 produces electricity equivalent to half a million homes' annual consumption annually
• +3 more outcomes

Named customers3 records

Segments2 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

Feature4 records

Partnerships

Five partnerships are on record, tiered core, major and minor.

• SKB (Svensk Kärnbränslehantering AB)coreStrategic or Co-development PartnerSKB is responsible for Sweden's nuclear waste management system. OKG collaborates with SKB for spent fuel storage (Clab) and final repository (SFR in Forsmark). OKG also operates a joint visitor center (Elektronen) with SKB in Oskarshamn.
• Uniper, Blykalla, KTH, ABBcoreStrategic or Co-development PartnerOKG (under Uniper) is collaborating with Swedish companies Blykalla, KTH, and ABB to develop Small Modular Reactors (SMR) on the Simpevarp peninsula, including building an electric test reactor.
• URENCOmajorTechnology or IntegrationURENCO is the supplier of OKG's annual enriched uranium fuel requirements. OKG's contract with URENCO specifies acceptable countries of origin including USA, Australia, Canada, Kazakhstan, and Uzbekistan.
• Figeholm KonferensminorChannel Partner/ Reseller/ DistributorFigeholm Konferens provides contractor accommodation near OKG's facilities, offering cabins, camping, and hotel rooms. OKG has accommodation agreements in place with this facility for contractors working at the plant.
• Nord PoolcoreChannel Partner/ Reseller/ DistributorNord Pool is the Nordic electricity exchange market through which OKG sells all its electricity production. OKG reports operational status and prices through this exchange.

Scale indicators10 records

Recent moves8 records

Expansion highlights5 records

Others

• Westinghouse Electric Company: Nuclear technology vendor and service provider; comparable as an adjacent/ecosystem participant supplying reactor technology, fuel, and services to operators like OKG.
• Studsvik AB: Swedish nuclear services and decommissioning specialist; comparable to OKG on the decommissioning/dismantling side of the business and as a Nordic nuclear ecosystem participant.

Emerging players

• Blykalla AB: Swedish lead-cooled SMR developer partnering with OKG on the Simpevarp test reactor; comparable as a co-developer in the same SMR initiative and an emerging player in next-generation nuclear.

Broad incumbents

• Électricité de France (EDF): World's largest nuclear operator with 56+ reactors; comparable as a fleet-scale nuclear utility supplying baseload low-carbon power, though operating across diverse geographies and reactor types.
• Vattenfall AB: Swedish state-owned utility and majority owner of Forsmark and Ringhals; a broader incumbent competing in Swedish nuclear generation with a diversified portfolio including hydro and wind.
• Constellation Energy: Largest US operator of nuclear power plants; comparable as a merchant nuclear generator selling clean firm power into wholesale markets and pursuing capacity extensions.
• KHNP (Korea Hydro & Nuclear Power): South Korean state-owned nuclear operator with a fleet of PWRs comparable in scale to OKG's single-asset fleet; relevant peer for fleet operations and life-extension practices.

Direct peers

• Teollisuuden Voima Oy (TVO): Finnish nuclear operator running Olkiluoto BWR units and EPR; comparable Nordic nuclear operator with similar baseload supply model and wholesale market exposure.
• Forsmarks Kraftgrupp AB: Operates three BWR reactors in Sweden supplying ~12% of national electricity; comparable to OKG in reactor technology (BWR), baseload role, and Swedish regulatory framework.
• Ringhals AB: Swedish nuclear operator at Varberg operating BWR and PWR reactors; the closest geographic and operational peer to OKG, both operating commercial-scale Swedish nuclear under SSM oversight.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/OKGaktiebolag
• LinkedInlinkedin.com/company/okg-ab
• Instagraminstagram.com/okg.se

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles13 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 OKG