Explanatory note to the Industrial Environmental control report Ekibastuzskaya GRES-1 named after Bulat Nurzhanov LLP for the 1st quarter of 2025

April 28, 2025

Ekibastuzskaya GRES-1 LLP named after Bulata Nurzhanova is an operating electric power plant with a design electrical capacity of 4,040 MW (7 power units of 500 MW each, power unit No. 1 of 540 MW each). The installed capacity of the station is 4,040 MW. The power plant's operating mode is round–the-clock, year-round.

The main fuel of the power boilers is high–ash coal from the Ekibastuz deposits, and heating oil of the M-100 brand. Flue gas emissions from the plant's power boilers are discharged through two pipes No. 1 and No. 2, 300 m and 330 m high, with a mouth diameter of 13.26 m and 11.9 m, respectively.

To reduce the content of suspended solids in flue gases released into the atmosphere, st. №3, №4, №5, №6 They are equipped with LodgeCottrel type electrostatic precipitators at power units No. 2, No. 7, No. 8 of Alstompauerstavan CJSC.

Suppression (reduction of concentration) of nitrogen oxides at the plant is carried out by optimizing the fuel combustion process in boilers (operational and technological methods). Flue gases are not cleaned of gaseous substances at the station.

In the 1st quarter of 2025, 6,864,932,560 thousand kWh of electric energy was generated.

Atmospheric air. Air emissions control is carried out in accordance with the Industrial Environmental Control Program for 2025.

Monitoring of atmospheric air composition at the border of the sanitary protection zone of the station is carried out with the involvement of an accredited laboratory.

The content of sulfur dioxide, nitrogen oxides and carbon monoxide is determined in the selected samples.

According to the results of instrumental measurements carried out during the reporting period, the concentrations of controlled substances were within the regulatory limits.

The ash collection unit is tested annually at each working unit of the station. A technical report is prepared based on the test results.

Control over the standards of pollutants is carried out in accordance with the draft "Standards of permissible emissions" for 2025.

Based on the environmental impact permit No.:KZ92VCZ03343489 dated 02.10.2023.   for the period of validity 01.01.2024 to 31.12.2025 According to the Permit in 2025, Ekibastuzskaya GRES-1 LLP named after Bulata Nurzhanova is allowed to emit pollutants in volumes not exceeding 289.786 thousand tons. 

The emissions of pollutants for the 1st quarter of 2025 amounted to

Permit for emissions into the environment, number and date of issue Emission limits, Actual emissions for the reporting period Actual emissions for the same period last year Reason for the increase/decrease

in thousand tons/year thousand tons/year thousand tons/year emissions

No.:KZ92VCZ03343489 dated 02.10.2023   for the period of validity 01.01.2024 to 31.12.2025

Emissions, thousand tons/year 289,786 58,555 69,944 Reduction of pollutant emissions in

the decrease in the atmosphere and the volume of waste generation for the 1st quarter of 2025 compared to the same period last year is due to a decrease in electricity generation

Sulfur dioxide 185,728 33,659 44,225         

Nitrogen dioxide 55.55 13.249 14.263         

Inorganic dust 70-20% 34,788 8,699 8,350  

Nitric oxide 9.027 2.153 2.318         

Carbon monoxide 4,656 0.785 0.787

Fuel oil ash 0.001 0.000 0.000          

Other: 0.036 0.001 0.002      

Discharges, thousand tons/year no no no      

According to the results of instrumental and computational methods for determining pollutant emissions, no exceedances of the maximum permissible concentration and maximum permissible concentration were detected.

Monitoring of water resources. The source of water supply is the K.Satpayev canal, on which there are two water intakes: one water outlet for recharge of the cooling reservoir, the second water outlet for household farms.household needs and preparation of chemically desalinated and chemically treated water for power and hot water boilers.

Water metering through the head of the HVAC is carried out using water metering devices installed at the entrance of the VPU, HVAC- I and II stages of the start-up boiler house and the drinking water preparation unit "Struya". Daily accounting of the amount of water consumption and sanitation is carried out, no deviations from specific norms were observed.

Special water use at the station is carried out on the basis of permit No. KZ88VTE00257501 dated 08.08.2024. The Ertis series.

A circulating cooling system with a Zheng-geldy cooling reservoir has been adopted for the station.

Sampling and analysis of surface waters (reservoir, canal, recycled water, sewage treatment plant) is carried out monthly with the involvement of an accredited laboratory.

Monitoring of production waste. The main type of production waste at the enterprise (during the combustion of coal in the furnaces of boilers) is ash and slag waste, which is sent by hydrotransport to the ash dump in accordance with the design documents.

The ash dump, located in the drainless basin of the previously dried-up bitter-salty lake Karasor, is located 22 km east of the station site.

Monthly accounting is carried out for the formation and disposal of ash and slag waste and production waste.

Based on the environmental impact permit No.:KZ92VCZ03343489 dated 02.10.2023.   for the period of validity 01.01.2024 to 31.12.2025 According to the Permit in 2025, Ekibastuzskaya GRES-1 LLP named after Bulata Nurzhanova" is allowed to dispose of production and consumption waste in volumes not exceeding 6,495,144,481 thousand tons.

The volume of waste disposed in the 1st quarter of 2025 was:

Permit for emissions into the environment, number and date of issue Emission limits, Actual emissions for the reporting period Actual emissions for the same period last year Reason for the increase/decrease

in thousand tons/year thousand tons/year thousand tons/year emissions

No.:KZ92VCZ03343489 dated 02.10.2023   for the period of validity 01.01.2024 to 31.12.2025

Waste, thousand tons/year 6,495,142 1,705,469 1,637,099 The increase in waste generated in the 1st quarter of 2025 compared to the 1st quarter of 2024 is due to an increase in electricity generation.

Ash and slag 6,494,827 1,705,469 1,637,065          

Non-hazardous waste 0.313 0 0.034 

Hazardous waste 0.002 0 0    

Radioactive emissions, GBq/year no no no   

Soil monitoring.

Sampling and analysis of soil samples at the border of the sanitary protection zone of the power plant, the ash dump and the waste storage (landfill) is planned for the first quarter of 2025 on the basis of an agreement with the involvement of an accredited laboratory.

Sampling and analysis of samples is planned at 12 stationary points in accordance with current state standards.

• The boundary of the SZZ of the ash dump is 5 points;

• The boundary of the SZZ of the accumulator (landfill) of waste – 4 points;

• The border of the SZZ power plant – 3 points;

The head of the Environmental management service Esmukhanova M.M.