In 2025, as part of its scheduled efforts to maintain the readiness of the national power grid and adapt infrastructure to growing energy demand, KEGOC completed measures to increase transformer capacity at substations in the southern regions of Kazakhstan.
As part of these efforts, equipment modernization was completed at several substations in 2025, including the 220 kV Sastobe and 220 kV Saryozek substations.
220 kV Sastobe Substation: Power transformers T-1 and T-2, previously rated at 25 MVA, were replaced with 63 MVA transformers. This expansion allowed for an increase in the connected load on the "Shymkent - Zhambyl" transit route, accounting for future projects. Additionally, it enabled the transfer of 10–15 MW of consumer load (depending on grid conditions) from "Ontustik Zharyk Transit" LLP via 35 kV networks to the Sastobe substation. This has partially relieved the autotransformers at the "Kazygurt" and "CHPP-3" substations, which previously operated near nominal capacity, thereby improving the reliability of the power supply for Shymkent and surrounding districts.
220 kV Saryozek Substation: Under the same program, an autotransformer was replaced, doubling its capacity from 32 MVA to 63 MVA. This eliminated power deficits, created conditions for connecting new large-scale consumers, and enhanced grid stability. The increased capacity has established a reserve that ensures a steady power supply across various grid operating modes.
These implemented measures have increased the throughput capacity of the electrical grids, enhanced the reliability of the energy supply, and created an additional power buffer to accommodate future load growth.
In parallel, KEGOC continues the preparation and implementation of investment projects for further capacity increases at southern substations, including "Zhalagash," "Zhanatas," "Kazygurt," "Myrgalymsai," "Kyzylorda," and the "Zhetisu" substation in Taldykorgan. Design and estimate documentation is currently being developed for several sites to finalize technical solutions and expansion parameters.
The southern regions of Kazakhstan are actively developing as industrial, agro-industrial, and tourism hubs. The consistent increase in transformer capacity provides a stable foundation for investment and social projects, entrepreneurship development, and the improvement of the population's quality of life.