Iran’s nuclear programme is one of the most closely examined in the world, but its actual nuclear electricity sector is small. The country operates one commercial reactor, Bushehr unit 1, which provides less than 2% of Iran’s electricity.
This creates an important distinction. Iran has a broad nuclear programme that includes uranium conversion, enrichment, fuel research and research reactors, but most of those activities do not supply its operating power plant. Bushehr uses Russian-designed technology and Russian-manufactured fuel.
Iran intends to expand nuclear generation, beginning with additional units at Bushehr. Whether it can build a much larger fleet depends on foreign cooperation, construction progress, sanctions, financing and the safety of nuclear facilities in an increasingly unstable regional environment.
Bushehr Is Iran’s Commercial Nuclear Power Sector
Bushehr Nuclear Power Plant stands on the Persian Gulf coast in southern Iran. Its first unit is a Russian-designed VVER pressurised water reactor with a net generating capacity of approximately 915 MW and a gross capacity of 1,000 MW.
The plant’s history reflects Iran’s changing international relationships. Construction originally began under agreements with West Germany before the 1979 Iranian Revolution. The unfinished project was later revived with Russian assistance, requiring engineers to adapt a modern Russian reactor design to part of the existing site.
Bushehr unit 1 first supplied electricity to the grid in 2011 and entered commercial operation in 2013. In 2024, it generated approximately 6.4 TWh, accounting for about 1.7% of Iran’s electricity production.
That contribution is useful but not transformative. Iran’s power system is much more dependent on natural gas, supplemented by oil, hydropower and a growing amount of renewable generation. One reactor cannot significantly reduce fuel consumption across such a large electricity market.
Bushehr nevertheless has strategic value. It gives Iran experience in operating a commercial nuclear station, maintaining a large reactor, managing nuclear safety and training specialised personnel. It also provides a base for adding more units at a site that already has transmission, cooling and security infrastructure.
Russia Remains Essential to Reactor Operations and Expansion
Bushehr unit 1 is operated by Iran’s Nuclear Power Production and Development Company, but its reactor technology and fuel supply are closely connected to Russia.
Russia’s TVEL supplies fabricated fuel for the VVER reactor. The arrangement separates Bushehr’s electricity production from Iran’s domestic enrichment programme. Fuel for the operating plant is manufactured to the technical requirements of the Russian-designed reactor rather than being drawn directly from Iran’s stock of domestically enriched uranium.
This relationship has helped keep Bushehr operating despite sanctions affecting other parts of Iran’s economy. It also creates a dependency on Russian fuel, engineering support and nuclear supply chains.
The partnership extends to new construction. Bushehr unit 2 is a VVER-1000-class reactor with approximately 974 MW of net capacity. Construction officially began in September 2019. Iran and Russia have also worked on plans for a third unit at the site, although Bushehr unit 3 is not yet listed by the IAEA as a reactor under construction.
Adding units 2 and 3 would create a multi-reactor complex capable of supplying a more meaningful share of Iran’s electricity. It would also concentrate much of the country’s nuclear generation at one coastal location, making site protection, grid connections and emergency planning increasingly important.
New Reactor Ambitions Extend Beyond One Construction Project
Iranian authorities have presented nuclear power as a way to conserve oil and natural gas, diversify electricity generation and support long-term energy security. In principle, a country with large hydrocarbon reserves may still benefit from nuclear generation because gas used in power plants cannot be exported, processed into petrochemicals or reserved for winter heating.
Iran has discussed a much larger nuclear fleet and has announced projects beyond Bushehr. These include plans for a domestically designed reactor at Darkhovin in Khuzestan and additional nuclear capacity in coastal regions. However, announced ambitions remain far ahead of construction achieved on the ground.
Large nuclear projects require long-term financing, specialised components and reliable international supply relationships. Sanctions restrict access to many of these resources and increase the cost of procurement. Currency pressure and competing domestic investment needs add further difficulty.
Bushehr unit 2 is therefore the most important test of Iran’s ability to move from a single-reactor programme to sustained nuclear construction. Its value is not limited to the electricity it may eventually generate. Completion would show whether Iran and Russia can deliver another large reactor under difficult political and commercial conditions.
Electricity Generation and Uranium Enrichment Are Different Issues
International coverage often describes Iran’s “nuclear programme” as though power generation and uranium enrichment were one activity. They are technically connected through the nuclear fuel cycle, but they have different immediate purposes and different international implications.
Commercial light-water reactors generally use uranium enriched to low levels. Bushehr receives fabricated Russian fuel under a dedicated supply arrangement. Iran’s production of uranium enriched to 20% and 60% uranium-235 is not required to operate Bushehr unit 1.
This distinction explains why the international dispute surrounding Iran’s enrichment facilities is much larger than the electricity produced by its nuclear plant. Facilities such as Natanz and Fordow, along with uranium conversion and fuel-manufacturing operations, are central to safeguards and non-proliferation concerns rather than to Bushehr’s daily output.
The IAEA reported that Iran possessed hundreds of kilograms of uranium enriched to 60% by early 2026. It also reported major limits on inspection and verification activities following military attacks and political restrictions. Without regular access, the agency has said that its ability to confirm the status and location of nuclear material is reduced.
These disputes affect nuclear power development even when they do not involve Bushehr directly. Sanctions, diplomatic isolation and uncertainty around safeguards make international financing and supplier participation more difficult. They also reinforce Iran’s dependence on a small number of foreign partners.
Armed Conflict Has Made Nuclear Safety a Regional Issue
Bushehr was designed as a civilian power station, but its location and strategic importance have placed it within a broader security crisis.
During military conflict in 2026, Iranian authorities reported projectiles striking the Bushehr site or landing close to its perimeter. Initial incidents did not produce reported damage to the reactor, although a later event affected an on-site building and caused a fatality among protection personnel.
An operating power reactor requires continuous cooling, dependable off-site electricity and access for trained staff. Damage to transmission lines, cooling systems or emergency power arrangements could create serious risks even without a direct strike on the reactor building.
The consequences would not be limited to Iran. Bushehr lies on the Persian Gulf, close to several neighboring states and important coastal industries. A severe release could affect maritime traffic, desalination facilities, fisheries and communities across the region.
Physical protection and emergency preparedness have therefore become immediate parts of Iran’s nuclear energy outlook. Construction progress alone cannot define the programme’s success if the operating environment does not protect workers, equipment and essential external power supplies.
Iran’s Nuclear Future Depends on Completing a Second Reactor
Iran possesses extensive nuclear knowledge and infrastructure, but commercial nuclear power remains concentrated in one operating unit. Bushehr unit 2 is the clearest measure of whether that position will change.
Completion would nearly double Iran’s nuclear capacity and create a foundation for a larger station. Continued delays would leave nuclear generation as a small part of an electricity system dominated by natural gas.
The longer-term outlook depends on more than engineering. Iran requires stable international partnerships, dependable fuel supply, investment and an inspection environment that reduces political uncertainty. It also requires protection of operating nuclear facilities during regional conflict.
Iran’s nuclear power ambitions are substantial, but the near-term reality is narrower: one operating reactor, one large reactor under construction and a programme whose development is inseparable from diplomacy and security.
