Hybridization of energy storage systems in post-mining infrastructure

The purpose of the work within WP.6 of the project titled “Hybrid energy storage system using post-mining infrastructure” (HESS, No. 101112380) is to integrate three energy storage systems: an underground pumped-storage hydropower plant (PSH), a compressed gas energy storage system (CGES), and a thermal energy storage system (TES).

Within this stage of the project, balance calculations were carried out for the integrated HESS system, together with the selection of storage capacities and preliminary optimization of operation, taking into account:

• the operating cycle characteristics of the systems (charging and generation), including operating parameters,
• analysis of the operating cycles of similar PSH units,
• analysis of changes in electricity prices on the Day-Ahead Market (DAM) in 2021–2024, the initially assumed revenues from price arbitrage.

In addition, changes in the share of individual cost components were analyzed: price arbitrage, system services, and the balancing market, in relation to the revenues from operation of the HESS system.

In summary, the analyses performed made it possible to preliminarily determine the optimal operating parameters and storage capacity configuration, confirming the validity of hybridizing PSH, CGES, and TES systems in post-mining infrastructure.