Croatia finally priced the grid hook-up. Hybrid solar-plus-battery sites now pay on the higher of import or export.
From 1 May 2026, HERA replaced case-by-case actual-cost connection fees with nationwide EUR/kW unit charges. For a factory with solar and a battery, the bill uses the higher of import or export capacity - so oversizing either side raises the fee.
For more than three years, connecting a new solar plant or a big industrial load in Croatia meant guessing the grid bill. Operators worked out "actual costs" site by site. Early models were soft. Lenders hated it.
On 27 April 2026 the Croatian Energy Regulatory Agency (HERA) adopted a Decision on Unit Charges for Connection to the Electricity Grid. It took effect on 1 May 2026. Kinstellar's summary: a uniform EUR/kW tariff now applies across the country, implementing the existing Methodology (Official Gazette 84/22) under the Electricity Market Act.
Simple formula. Fixed unit price, times connected capacity. Connected capacity is the higher of import (consumption) capacity or export (generation) capacity.
Think of a warehouse door that both receives trucks and ships them. You are charged for the bigger door, not both doors added together. Make either door wider than you need and you pay for that width.
HERA also splits the bill into two layers: connection works (the physical link) and system costs (the contribution to making the wider network ready - Croatian: stvaranje tehnickih uvjeta u mrezi, STUM).
Published unit prices in the Kinstellar note: low voltage (0.4 kV) EUR 193/kW for connection works plus system costs; medium voltage (10-35 kV) EUR 96.50/kW for that pair, with a combined medium-voltage charge listed as EUR 106/kW; high / very high voltage system costs listed at EUR 9.50/kW in one table line and EUR 19/kW at 110 kV, with connection works still at actual construction cost. Confirm the high-voltage lines against the HERA Decision text itself - the law-firm table packs several voltage bands.
Hybrid sites feel this rule hardest. Oversizing the battery beyond the export limit, or lifting export capacity "for later," both raise the chargeable capacity. Design the import/export pair first. Then size the battery. Not the other way around.
Two BESS routes under the Methodology, as Kinstellar reads it. Standalone BESS as a new grid user pays the standard unit price for its voltage level, higher of import or export. BESS added via a separate metering point next to an existing generation or consumption site pays only the actual cost of the storage connection, with no system cost charge. That second path can change the spreadsheet for a factory that already has a meter and wants a yard battery.
Good: early-stage budgeting is possible again. Lenders can put a number in the model before the connection study lands. HERA set fees below what the transmission and distribution operators first proposed, per the law firm, so as not to kill renewables economics or lift retail tariffs. Large industry and data centres get lower per-kW fees at higher voltage - the piece flags that as deliberate support for big consumers.
Bad: predictable is not the same as cheap. Medium-voltage still sits near EUR 100/kW. A 2 MW export gate is real money before you buy a single panel. High-voltage connection works stay project-specific; the unit charge only covers the system-cost slice there.
Ugly: the Decision does not print a special BESS unit price. Economics hang on which connection route you pick. Pick the wrong metering structure and you pay the standalone tariff when the co-located path was available. That is a lawyer-and-engineer problem, not a brochure problem.
Source: Kinstellar, May 2026 - Croatia resets grid connection cost certainty trough nationwide unit charges from 1 May 2026. Figures and quotes as published in the firm note. High-voltage EUR 9.50 vs EUR 19/kW lines flagged for check against the HERA Decision (OG) text and Methodology NN 84/22. No site payback on this page.