Analysis of electric energy transport by power distribution networks of JSC Tyvaenergo over the period of 2017 – 2022 has been carried out. The structure of the company is considered, the characteristics of the main elements of the studied electric networks are given, the balance of the transmission of electric energy in and out of the company's networks is estimated. Based on the information published in open sources on the rate of accidents in the company's electrical networks, an estimate has been made of the number of emergency situations that occurred during the period under study. The duration of interruptions of power supply to consumers, as well as the amount of undersupply of electric energy caused by those interruptions, has been estimated. The influence of the seasonal component on the number of emergencies during the period under study is considered. Based on the data for the last quarter of 2022, analysis of the main causes of damage to elements of electrical networks has been carried out. The classification of failures is made, their main characteristics for this period are considered. The percentage ratio of the number of failures for the most characteristic reasons to the total number of outages during the period under study has been established. A technical tool is proposed to improve the reliability in conditions of unbalanced power consumption. General scientific methods, numerical methods of analysis, methods of the theory of electrical circuits were used in the research. To visualize the results of the analysis, the technologies of the MATLAB graphics editor were used. The results obtained may be of interest to the heads of power grid companies, as well as researchers and engineers engaged in research in the field of reliability of power supply.

The arrangement of heat supply of residential buildings with independent connection to external heating networks is considered, which ensures the reliability of heat supply and the necessary comfort in the premises in cold weather conditions after the official termination of the heating season or before it begins due to the supply of water from the return main of the heating network after the DHW heat exchangers. A mathematical model describing the non-stationary modes of operation of heaters of the heating system under the conditions of the implementation of this arrangement is constructed and studied. Calculations were carried out using this model, including numerical simulation on a computer using the Monte Carlo method. It is established that in this case, due to fluctuations in the waste water consumption following the daily variation in water consumption at the DHW, there occurs a decrease in the average heat transfer coefficient of the heater of the heating system and its temperature efficiency due to the fact that these values depend on the flow rate in a non-linear way, and their growth during the period of increased water intake at the DHW does not compensate for the decrease during the reduction of water consumption. It is noted that in this case, the reduction of the heat transfer coefficient lies within the usual error of engineering calculation, and this effect can be neglected. It is proved that, with a small number of heat transfer units in the heater of the heating system attributed to the heated flow, the total amount of heat transferred can decrease quite significantly (by up to 30 percent); however, with a rational choice of the heater size, such a decrease is within the limits allowed by the margins applied when setting the flow rate of delivery water and determining the heat transfer area.

A large area of Russia’s territories, where consumers are not connected to the centralized energy system, leads to the need to use autonomous energy sources. Most often, these are built on the basis of diesel power plants and have a number of logistical and operational problems. These factors lead to a high cost of electricity with low indicators of environmental friendliness and equipment reliability. As a result, renewable energy sources are becoming more and more popular. An important advantage of RES in comparison with fossil fuel energy sources is that these resources are virtually inexhaustible, and many of them are ubiquitous.

A significant place in terms of reserves and scale of use is occupied by the energy of water flows. It is important to note that small hydropower is the most stable energy source among RES. High reliability and efficiency, as well as wide possibilities for regulating the energy of the water flow, make it possible to use simpler and cheaper systems for generating and stabilizing the parameters of the produced electricity. As a result, hydroelectric power plants produce cheaper electricity compared to power plants operating on other resources.

Small hydraulic turbines operate with small hydraulic capacities; therefore, it is possible to increase the efficiency of electricity generation supplied to the final consumer by reducing losses in the flow path in front of the hydraulic turbine impeller by changing its shape. To do this, when developing microhydroturbines, it is necessary to create the most streamlined structures: both the working bodies of the hydroturbine and the supply channels, as well as the impeller fairing. The results of a study of the influence of a change in the shape of the latter on the magnitude of pressure losses are presented using the results of computational and theoretical studies, on the basis of which a further direction for the development of this topic is proposed.

A logical and sequential model of calculation of standards of process losses of heat energy and heat carrier, as well as electricity costs during transmission of heat energy in heating networks has been developed and built using MS Excel. The model constitutes a group of files interconnected by links, which allows perceiving the whole group of files as a single program. All the user needs to do is enter the source parameters of the heat network sections, such as length, diameter, year of installation, temperature curve, network operation time, pumping equipment characteristics, network operation temperature schedule, ambient temperature norms in accordance with the region of calculation, and the output will be a ready detailed calculation of all the normal rates. In the process of successive calculation, such normative values as heat energy losses, heat carrier costs, hourly heat energy losses under average annual network operating conditions, annual heat energy losses are determined. Besides, hourly and annual losses of heat carrier with leaks are determined. Power consumption is calculated on the basis of factory and operating parameters of pumping equipment operation. The results of standard calculations are summarized in a consolidated table, where both monthly and annual figures are shown. The procedure makes it possible to considerably decrease the time spent on calculations of normal rates, to make a forecast for heat energy balance, to analyze the dynamics of actual and estimated values. The methodology has been successfully proven, with multiple approvals of standards of process losses of heat energy, heat carrier, and electricity consumption during transmission by the Ministry of Energy of the Russian Federation.

In a period from 2000 till 2020, a program of power industry modernization through Capacity Supply Agreements (DPM program) was implemented in Russia. Within the DPM program, more than a hundred power facilities were put in operation, including foreign-made equipment and equipment partly localized in Russia.

Since the foreign companies left the Russian market, an actual state target is now to localize the main and auxiliary equipment for combined-cycle power plants as well as to replace missing manufacturing technologies for manufacture of new apparatuses and spare parts.

Hundreds of foreign-made compressors are currently in operation as a part of booster compressor units for combined-cycle power plants. In this context, Nevskiy Zavod JSC has developed a line of booster compressor units of its own with a capacity up to 10 MW to replace the foreign equipment.

Booster compressor units are developed based on high-efficiency centrifugal compressors (CECO) in single- and double-section design. CECOs are made with a forged barrel type casing and equipped with dry-running gas seals that include buffer and separation gas systems as well as gas leaking control system. CECOs are also equipped with sliding bearings with an antifriction polymeric composite coating instead of traditionally used babbit B-83, which improves the operational properties significantly.

The main advantages of the booster compressor units produced by Nevskiy Zavod JSC are 100% implementation of domestic components and materials as well as use of unified flow path components, bearings and sealing units, increased polytropic efficienсу, complete technical service and a possibility of usage for combined-cycle power plants equipped with foreign gas turbines of different manufacturers.