How Many Nuclear Power Plants Does Iran Really Have?

Overview of Iran’s Nuclear Power Program

Iran’s civilian nuclear program stands as a testament to the nation’s pursuit of energy independence and technological sovereignty, developed over decades amid complex geopolitical dynamics. As of September 27, 2025, Iran operates one nuclear power plant, with multiple units under construction and several more in advanced planning stages. This infrastructure is central to addressing the country’s growing electricity demand, which has been strained by population growth, industrial expansion, and seasonal shortages. The Atomic Energy Organization of Iran (AEOI) oversees these efforts, focusing on peaceful applications such as power generation, medical research, and desalination projects. Data from the International Atomic Energy Agency’s Power Reactor Information System (IAEA PRIS) confirms one operational reactor connected to the national grid, contributing modestly but significantly to Iran’s energy mix.

The program’s roots trace back to the 1950s under the Atoms for Peace initiative, but it gained momentum in the 1970s with plans for up to 20 reactors. Post-1979 Revolution, international partnerships shifted, leading to delays and self-reliance in key technologies. Today, Iran’s nuclear reactors are designed for dual purposes where feasible, such as combining electricity production with nuclear desalination to tackle water scarcity in coastal regions. Despite ongoing challenges, including the reimposition of UN sanctions on this very date, September 27, 2025, Iran’s commitment to expanding its nuclear power capacity in MWe remains unwavering. Recent agreements with international partners have injected new momentum, ensuring progress even as external pressures mount.

Iran’s nuclear electricity share currently hovers around 1-2%, but projections for the 2025 energy mix anticipate a rise to 5-10% as new units come online. This diversification is crucial in a hydrocarbon-rich nation facing electricity shortages, where nuclear power offers stable baseload energy unaffected by fuel price fluctuations or seasonal gas demands. The program’s evolution reflects broader regional trends, where Middle Eastern countries increasingly turn to nuclear energy for sustainable development.

Operational Nuclear Power Plants in Iran

At present, Iran’s operational nuclear footprint is anchored by a single facility, yet it serves as a foundation for broader ambitions. The Bushehr Nuclear Power Plant exemplifies Iran’s ability to navigate international collaborations and technical hurdles to achieve energy goals.

Bushehr Nuclear Power Plant: Iran’s Flagship Facility

Situated in the southern Bushehr province along the Persian Gulf, the Bushehr Nuclear Power Plant houses Bushehr Unit 1 (Bushehr-1), Iran’s sole operational nuclear reactor. This pressurized water reactor (PWR), a VVER-1000 model designed by Russia, boasts a net capacity of 915 MWe and a gross capacity of 1,000 MWe. It first connected to the grid on September 3, 2011, and commenced commercial operations in September 2013. Over the years, Bushehr-1 has demonstrated robust performance, with a capacity factor averaging 80-90%, though subject to periodic maintenance for refueling and upgrades.

Bushehr Nuclear Power Plant in Iran on the Persian Gulf coast

In 2024, the reactor generated approximately 6,439 GWh of electricity, offsetting the equivalent of millions of tons of fossil fuels and reducing reliance on oil and gas exports. This output addresses part of Iran’s chronic electricity shortages, which have intensified in recent summers due to aging infrastructure and high demand. Beyond power, Bushehr-1 integrates nuclear desalination, with a unit operational since 2014 supplying fresh water to local communities. An expanded desalination project, initiated in 2022, aims for 70,000 cubic meters per day, highlighting the plant’s role in multifaceted resource management.

Fuel supply for Bushehr-1 is managed through agreements with Russia’s Rosatom, which also handles spent fuel repatriation, aligning with global non-proliferation norms. Despite sanctions impacting spare parts and financing, the plant has maintained safety standards, enduring natural events like earthquakes without incident. Recent maintenance in May 2025, including refueling, ensured continued reliability amid growing national needs.

Nuclear Power Plants Under Construction

Iran’s expansion efforts are evident in ongoing construction projects, which aim to triple current capacity in the coming years. These developments underscore the nation’s strategic focus on indigenous capabilities and resilient partnerships.

Bushehr Unit 2 and Unit 3

Expanding the Bushehr site, Unit 2 (Bushehr-2) is under active construction since November 2019. This 974 MWe net capacity PWR, with a gross of 1,057 MWe, is slated for grid connection by 2028, though timelines have adjusted due to external factors. Unit 3 (Bushehr-3), similarly designed, is in preparatory phases, with full construction expected imminently. These units stem from a 2014 protocol with Rosatom, envisioning up to eight reactors across Iran.

Construction site of Bushehr Unit 2 nuclear power plant in Iran

Progress has been steady, with first concrete poured for Unit 2 in 2019. Officials anticipate both units joining the grid within four to five years, boosting nuclear output significantly. The recent $25 billion agreement signed on September 26, 2025, between Iran and Russia for four additional nuclear power plants further bolsters this trajectory, including potential enhancements at Bushehr. This deal, amid looming sanctions, demonstrates Iran’s adeptness in securing international support for its civilian program.

Darkhovin Nuclear Power Plant

In Khuzestan province, the Darkhovin Nuclear Power Plant represents a milestone in Iran’s self-developed technology. Construction on the 360 MWe IR-360 light water reactor commenced in December 2022, with a projected timeline of eight years and costs estimated at $1.5-2 billion. This indigenous design highlights Iran’s growing expertise, reducing dependency on foreign vendors.

Satellite imagery and reports indicate ongoing site work, despite regional disruptions, including military actions in June 2025 that affected nuclear infrastructure. Darkhovin is poised to support local industries plagued by power deficits, integrating into Iran’s broader energy strategy.

Design model of Darkhovin Nuclear Power Plant and water treatment facility in Iran

Hormoz Nuclear Power Plant

Near Minab and Sirik in Hormozgan, the Hormoz plant broke ground in February 2024. Planned for four units totaling 5,000 MWe at a $15 billion investment, it targets energy needs in this vital region. Early phases focus on infrastructure, with technology details evolving through partnerships.

Planned Expansions and Small Modular Reactors in Iran

Iran’s vision extends to achieving over 20,000 MWe by 2040, with plans for additional sites. A memorandum signed on September 24, 2025, with Russia for small modular reactors (SMRs) introduces flexible options for remote areas. Proposals include two 100 MWe SMRs on the Makran coast using Chinese technology, enhancing grid resilience.

3D model of small modular reactor design for nuclear power generation

Further expansions at Bushehr and new facilities in northern provinces align with the 2025 energy mix, where nuclear mitigates shortages amid a 14,000 MW summer deficit. These plans incorporate renewables, fostering a balanced portfolio.

Research Reactors vs. Power Plants in Iran

Distinguishing research from power reactors is key to understanding Iran’s program. The Tehran Research Reactor (TRR), operational since 1967 at 5 MW, focuses on isotopes and training. The Arak heavy water reactor (IR-40), redesigned post-JCPOA, supports scientific endeavors without power generation capabilities.

Isfahan hosts four small research units, including a Chinese-supplied miniature reactor. Plans for a 20 MW isotope reactor and a 10 MW unit at Shiraz emphasize civilian applications, all under IAEA safeguards.

Power plants, conversely, prioritize grid electricity, maintaining a clear separation for transparency.

Iran’s Nuclear Power Capacity and Electricity Generation

Current capacity is 915 MWe net from Bushehr-1, yielding 6,439 GWh in 2024. This saves substantial fossil fuels annually. With expansions, capacity could surpass 3,000 MWe by 2030, elevating the nuclear share.

High capacity factors at Bushehr underscore reliability, though outages occur. Nuclear’s baseload role is vital amid Iran’s energy crises.

Key Data on Iran’s Nuclear Reactors

To provide a clear overview, the following table summarizes Iran’s nuclear reactors:

Reactor Name	Location	Type	Status	Net Capacity (MWe)	Gross Capacity (MWe)	Grid Connection Date
Bushehr-1	Halileh	PWR	Operational	915	1000	2011-09-03
Bushehr-2	Halileh	PWR	Under Construction	974	1057	Expected 2028
Bushehr-3	Halileh	PWR	Planned	974	1057	Expected post-2028
Darkhovin	Khuzestan	LWR	Under Construction	360	N/A	Expected 2030
Hormoz Units 1-4	Hormozgan	PWR (TBD)	Planned	1250 each (total 5000)	N/A	TBD

This table draws from IAEA and industry reports, illustrating the program’s scope.

International Cooperation: The Role of Rosatom and Others

Rosatom’s involvement has been instrumental, from completing Bushehr-1 to recent deals for eight units by 2040. The September 2025 agreements, including SMRs, counter sanction effects.

China contributes through SMR proposals, while Hungary explores collaborations. These ties enable knowledge transfer, vital for Iran’s self-sufficiency.

Safety, Inspections, and IAEA Involvement

Safety protocols at Iranian facilities meet international standards, with Bushehr-1 resilient to seismic events. The Iran Nuclear Regulatory Authority (INRA) and IAEA conduct inspections, confirming peaceful intent despite enrichment debates.

AEOI Vice President Mohammad Eslami affirmed transparency in September 2025, even as snapback sanctions activate. Iran remains committed to safeguards, though not yet party to the Nuclear Safety Convention.

IAEA inspectors wearing helmets at an Iranian nuclear power facility

The Impact of Sanctions on Iran’s Nuclear Energy Development

Sanctions have historically delayed projects, inflating costs and fostering indigenous innovation. The U.S. JCPOA withdrawal in 2018 prompted enrichment resumption, but power generation persists unaffected. June 2025 strikes degraded capabilities by up to two years, per assessments, yet recovery efforts continue.

Today’s UN snapback reimposes asset freezes and arms embargoes, potentially complicating imports. However, partnerships with Russia and China mitigate impacts, allowing progress.

Nuclear Power in Addressing Iran’s Electricity Shortages

Iran grapples with severe electricity deficits, exacerbated by mismanagement, subsidies, and sanctions. A 2025 summer shortfall of 14,000 MW, 15% of peak has led to blackouts paralyzing industries. Nuclear power counters this by providing reliable energy; Bushehr-1 alone alleviates pressure, and new units will add thousands of MWe.

Amid water crises and power outages, nuclear desalination and generation offer integrated solutions. Winter 2025 shortages loom, but expansions promise relief, reducing reliance on inefficient thermal plants.

Middle East Nuclear Power Comparison

The Middle East’s nuclear landscape varies, with Iran positioned as a key player. The UAE’s Barakah plant operates four units at 5,600 MWe, enjoying public support. Saudi Arabia plans 16 reactors but has none operational. Turkey’s Rosatom-built Akkuyu nears completion, while Egypt’s El Dabaa advances slowly.

Iran, with its operational reactor and pipeline, parallels UAE’s progress. Unlike Israel’s opaque military program without power plants, Iran’s is civilian and monitored. This disparity highlights potential for regional cooperation, though tensions persist. As nuclear energy grows, it could promote shared stability, with Iran’s advancements contributing to broader energy security dialogues.