Bosnia and Herzegovina is set to have its first battery energy storage systems installed in the transmission network, which will provide auxiliary services.
The State Electricity Regulatory Commission is drafting a decision to allow battery energy storage systems (BESS) to offer secondary frequency regulation, Mirza Kušljugić, a member of the Board of the Regional Center for Sustainable Energy Transition (RESET) from BiH, said at Belgrade Energy Forum 2025 (BEF 2025).
Since such a decision does not require a lengthy regulatory procedure, and the balancing market is already regulated, batteries could be installed very soon, he noted.
“I anticipate that private investors will take the lead in this initiative,” Kušljugić added.
He stressed the importance of experimenting with new technologies, noting that batteries represent a technology that can fundamentally transform the energy paradigm.
To be economically viable, batteries must serve multiple functions
The cost of batteries has significantly decreased in recent years. For instance, prices fell by 40% last year and have decreased by an additional 5% so far this year.
According to Kušljugić, batteries should not be limited to providing arbitrage but should also perform additional roles.
“Batteries come in various sizes – small, medium, and large – each with specific functions. They can regulate voltage or enable a black start, especially when equipped with new grid-forming inverters. This is a disruptive technology. It doesn’t matter whether it is installed on the transmission grid, the distribution grid, or behind the meter,” noted Kušljugić, who moderated the BEF panel titled Energy revolution underway – uniting efforts to deliver green, intelligent and sustainable energy solutions.
He added that batteries in the transmission system need to perform two or more functions, including frequency regulation.
Behind-the-meter batteries are also on the way
Historically, secondary regulation in BiH has been provided by any entity capable of offering flexibility, typically through tenders. So far, the service has mostly been provided by hydropower plants. However, due to lower nighttime prices, their operators were not interested in continuing to supply the service, leading to a shortage of secondary regulation. Batteries now have the potential to fill this gap.
Kušljugić believes that batteries installed behind electricity meters will soon become a reality in BiH as well. Currently, there are 300 to 350 MW of solar power capacities installed on the roofs of business premises, but their owners cannot feed excess electricity into the grid. It is only a matter of time before battery prices decrease enough to facilitate their installation, he underlined.
RESET, which advocates for citizen energy and prosumers, suggests that all solar installations should now be equipped with hybrid inverters, making them ready for future battery integration.
This approach is essential for the distribution grid to be ready to integrate excess electricity, Kušljugić concluded.