**6. Conclusions**

Overall, it can be stated that the need and prospects for the development of renewable energy across the world are confirmed today by various stimulating legal and economic acts and laws, including those located in the area of creating differentiated power grid tariffs for consumers.

At the same time, as the conducted study showed, the applied system of state tari ff di fferentiation often not only does not lead to the formation of economic incentives for optimizing electricity consumption when introducing power plants for renewable energy, but also turns out to be less beneficial for the consumer than simple one-rate tari ffs. This is due to the fixed values of the transition to tari ff zones at half-peak and peak rates, which do not correspond to the real daily consumption graph of the region's households. The situation is also aggravated by poorly justified di fferentiation of the tari ff by the volume of energy consumed during the period.

Analysis of the developed daily energy consumption graphs of households in the Krasnodar region on workdays and weekends showed that the rational use of solar power plants leads to a significant decrease in the amount of energy consumed from the power system in the half-peak zone of the load curve. At the same time, it is not possible to achieve a uniform distribution of the load on the power system during the day due to the use of autonomous solar installations. Energy consumption at peak hours is reduced, but the unevenness of the daily load graph remains. Consequently, there remains a need for the availability of maneuverable peak equipment in the power system, which is rapidly gaining power, even if the accumulative power equipment is installed to reduce the irregularity of the power consumption graph. At the same time, solar energy sources will displace half-peak power plants from the load graph, reducing the need of this generation for power system to ensure continuous power supply to consumers.

The development of automated systems for commercial metering of electricity along the path to the use of smart electricity meters allows developing electricity pricing methods with a much greater di fferentiation of consumption zones and tari ff rates than the existing ones. Thus, it is possible to solve the problem of inconsistency of the tari ff di fferentiation system by time zones and real daily energy consumption graphs.

Using the example of the Krasnodar region, it is shown that the proposed method of dynamic di fferentiation of the electricity tari ff allows a household to receive additional savings from the e ffective use of solar power and energy storage in terms of equalizing the energy consumption schedule. This creates a significant incentive for their use by households and contributes to the e ffectiveness of governmen<sup>t</sup> programs to support renewable energy sources, including solving the acute problem of increasing power grid tari ffs.

**Author Contributions:** Conceptualization, E.L. and G.K.; methodology, E.L., V.C., and G.K.; formal analysis, E.L., P.O., and V.C.; investigation, E.L.; resources, P.O. and V.C.; data curation, E.L., P.O., G.K., and V.C.; writing—original draft preparation, E.L., V.C., and P.O.; writing—review and editing, E.L.; visualization, E.L.

**Funding:** This research was funded by the Ministry of Education and Science of the Russian Federation, gran<sup>t</sup> number 26.9593.2017/8.9.

**Acknowledgments:** This paper was supported by the Ministry of Education and Science of the Russian Federation, research project No. 26.9593.2017/8.9.

**Conflicts of Interest:** The authors declare no conflict of interest.
