Montenegro’s 225 MW Pljevlja thermal power plant has returned to the grid following a transmission-related outage that forced state utility EPCG to rely on expensive short-term electricity imports.
The interruption began on 2 August, when a malfunction at a substation operated by CGES cut the plant’s external power supply. Although electricity was restored in approximately 80 minutes, the generating unit required additional inspections and stabilisation before reconnecting during the early hours of 6 August.
While Pljevlja was unavailable, EPCG imported around 7,500 MWh a day at an estimated daily cost of €760,000. That implies an average procurement cost of approximately €101/MWh, excluding any additional balancing, congestion or transmission effects.
Domestic solar plants supplied about 500 MWh per day, equivalent to only around 10% of Pljevlja’s normal daily output. Hydropower provided the principal domestic replacement, and EPCG postponed scheduled maintenance at the Perućica hydropower plant to preserve system adequacy.
Pljevlja normally provides roughly 40% of Montenegro’s electricity generation, making its return immediately significant for EPCG’s trading position and cash flow. The plant’s absence can turn Montenegro from a seasonally balanced system into a substantial importer within hours, particularly during dry and hot summer conditions.
The outage also highlights the interdependence between generation and transmission assets. CGES’s preliminary assessment linked the substation malfunction to a combination of extreme weather and industrial pollution rather than an internal grid defect. That distinction may become important when EPCG and CGES assess operational responsibility, insurance coverage and the allocation of outage costs.
The financial exposure is material. A ten-day interruption at the reported import rate would require approximately €7.6 million of replacement electricity. A month-long outage under similar conditions would approach €23 million, before considering adverse price movements.
EPCG has secured sufficient imported electricity to cover remaining domestic requirements through the end of 2026, reducing immediate security-of-supply risk. Forward procurement protects physical availability, but it may also lock in costs that become less attractive when Pljevlja, hydroelectric plants and new renewables generate above expectations.
The restart enables EPCG to resume preparation for the delayed Perućica overhaul. It does not resolve Montenegro’s structural concentration risk. Until substantial solar, wind, storage and flexible balancing capacity enters operation, a single failure at Pljevlja or a major hydropower facility will continue to have an outsized effect on imports and utility cash flow.
