Croatia distribution operator plans EUR 2 billion grid upgrade programme

The national energy regulator in Croatia has opened a consultation regarding an extensive network development strategy submitted by distribution system operator HEP ODS. The proposed framework commits EUR 2 billion towards modernising distribution networks over the coming decade. The capital expenditure seeks to resolve persistent capacity constraints, integrate distributed renewable generators, and modernise ageing equipment across regional substations.

Substation operators and network planners face mounting pressures from rapid electrification and the proliferation of solar installations connected at medium-voltage levels. Distribution substations commissioned decades ago are operating near thermal boundaries, with ageing power transformers and switchgear requiring structured replacement programmes. The commitment of EUR 2 billion creates a sustained procurement wave for primary equipment, including medium-voltage transformers, switchgear, and protection relays. For distribution engineers, widespread asset replacement necessitates careful planning of planned outages to prevent system disturbances during installation windows.

The modernisation drive also highlights the structural challenge of managing transformer loading profiles under bi-directional power flows. Substation designs across the region must transition from traditional radial supply arrangements to flexible distribution hubs capable of hosting distributed generation without causing voltage instability. This shift requires not only physical transformer replacements but also enhanced monitoring of tap changers, bushings, and oil condition to detect dielectric stress early.

What this means for asset owners in the Balkans and the Black Sea region: Substation and generation asset owners in Croatia face extended equipment lead times and tighter supply-chain availability as major distribution tenders absorb regional manufacturing capacity for transformers and switchgear. Industrial plants and renewable developers must schedule connection upgrades and maintenance outages well in advance to coordinate with planned distribution outages, ensuring critical replacement works proceed without unmanageable operational curtailment or supply interruptions.