Mirny is a 1GW onshore wind power project with a 300MW/600 megawatt-hour (MWh) integrated battery energy storage system (BESS) currently under development in Kazakhstan.
The project is being developed by Aktas Energy, a joint venture (JV) between TotalEnergies Renewables (60%), a subsidiary of TotalEnergies; KMG Green Energy (20%), a subsidiary of the national company KazMunayGas; and Qazaq Green Power (20%), a subsidiary of the national wealth fund Samruk-Energy.
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Representing an investment of approximately $1.4bn (KZT708.34bn), Mirny stands as the largest wind farm project to date in Kazakhstan.
Construction and installation work on the project is due to begin in March 2026 and the first power is expected to be supplied to the grid in 2028.
Once operational, the project is expected to generate around four terawatt-hours of renewable electricity per year, enough to meet the needs of around one million people, and equivalent to roughly 4% of Kazakhstan’s electricity production.
The project is expected to create up to 2,000 jobs during the construction period and another 250 jobs during operation.
The initiative aims to bolster grid stability and energy security, supporting the nation’s ambition to reach its target of 15% renewable electricity generation by 2030.
The project is also expected to avoid approximately 3.5 million tonnes of carbon dioxide emissions annually and help the country to achieve carbon neutrality by 2060.
Location
The Mirny onshore wind farm project is under development near the village of Mirny in the Zhambyl region in south-east Kazakhstan.
The project will capture the strong winds that cross the region’s semi-arid plains, averaging 8.9m per second annually, and convert them into low-carbon electricity.
Development timeline
In October 2021, the Ministry of Energy of the Republic of Kazakhstan; Total Eren, an affiliate of TotalEnergies; Samruk-Kazyna; and KazMunayGas signed a memorandum of understanding to develop the Mirny power project.
In November 2022, the governments of Kazakhstan and France signed a special agreement on cooperation to combat global warming with the development of major renewable energy projects including the Mirny project.
The Ministry of Energy of the Republic of Kazakhstan approved a tariff of $39.91/MWh in April 2023 for the wind farm.
The project partners signed a JV agreement in November 2023, followed by the signing of the law ratifying the intergovernmental agreement in February 2024.
TotalEnergies signed an investment agreement with the Ministry of Energy of the Republic of Kazakhstan in December 2023 for the project.
Mirny onshore wind farm details
The Mirny wind power project will comprise 140 wind turbine generators (WTGs), alongside a 600MWh BESS.
The project will feature 124 Envision EN182-8.0 WTGs, with a capacity of 6.5MW each and a hub height of 120m, and 26 Sany SI-19580 WTGs with a capacity of 7.7MW each and a hub height of 110m.
The development poses considerable technical challenges including extreme weather conditions, with temperature fluctuations of up to 70°C between summer and winter, as well as its remote location.
The project will include the construction of approximately 155km of new access roads, including around 57km to the south and 68km to the north.
In addition, 146km of existing access roads will be upgraded and 128km of on-site roads will be built to interconnect the WTGs.
Grid connection
The renewable electricity generated by the Mirny hybrid project will be evacuated to the grid by three 500 kilovolt (kV) overhead transmission lines with a combined length of 231km.
The first transmission will connect the project to the existing 500kV Yukgress substation, the second transmission line will connect the project’s northern substation with the southern substation and the third transmission line will connect the southern substation with the existing 500kV Shu substation.
The pylons of the transmission lines will feature three designs including steel lattice four poles, P2-type steel lattice, a two-pole free-standing structure and three-post lattice free-standing poles of P2 type.
Furthermore, the existing Shu and Yukgress substations will be upgraded as part of the project.
Power purchase agreements
In June 2023, TotalEnergies signed a 25-year power purchase agreement with the Financial Settlement Centre of Renewable Energy (FSC RES), a public entity owned by the Government of Kazakhstan.
Under the agreement, electricity generated by the Mirny wind project will be sold to FSC RES for delivery to the national grid.
Contractors involved
In October 2025, green technology company Envision Energy signed a letter of award (LoA) with the project partners to supply 124 wind turbines for the Mirny wind farm.
In the same month, another LoA was signed with Sany Renewable Energy for the supply of the remaining 26 wind turbines.
SAFT, a French company specialising in batteries and power cells and a subsidiary of TotalEnergies, has been selected as the supplier for the BESS.
An international consortium comprising Shanghai Institute of Mechanical and Electrical Engineering, Shanghai Electric Group and Kazakhstani company GCD Partner has been selected as the engineering, procurement and construction contractor for the project.
Engineering and professional services consultancy WSP was responsible for preparing the environmental and social impact assessment for the Mirny wind power project.
