Feasibility of integrating an energy storage system into the national power system as an electric energy balancing source

Abstract

The power system of the Republic of Moldova encounters limited flexibility in managing fluctuations between generation and load due to the low maneuverability of existing generation units and their restricted capability to adjust production according to demand variations. These limitations compromise system operational stability and threaten the continuity of electricity supply. In this context, the integration of advanced electric energy balancing resources into the National Power System (NPS) has become a critical requirement. This paper investigates the feasibility of deploying a utility-scale battery energy storage system (BESS) with a rated power of 10 MW and an energy capacity of 20 MWh. The study evaluates the techno-economic aspects of BESS implementation under the current conditions in the Republic of Moldova. By enabling market-based pricing for balancing and ancillary services, energy storage operators will be able to optimize revenue streams, participate in frequency regulation and peak shaving, and provide demand-response services. This environment will enhance the fesabillity of BESS projects, support higher penetration of variable renewable energy sources, and improve overall system reliability and operational efficiency.