Ombla hydropower plant, Croatia

The Ombla hydropower plant would be built in the vicinity of the Vilina Cave, near the spring of the Ombla river – a natural site of special significance:

• Underground karst rock formations that are associated to the spring contain a water system that runs for many kilometres through relatively soft and porous limestone rock.
• The area is home to a unique subterranean fauna: five species of protected bats; the fascinating proteus anguinus (sometimes known as the ‘human fish’ because of its flesh-coloured appearance) and several kinds of aquatic cave snails.

The importance of the area has also been recognised internationally:

• The spring and the karst rock formations will be a Natura 2000 site when Croatia joins the EU in 2013.
• Croatia’s underground fauna and the threats to it have already been covered by the BBC in its Newsnight programme.

HEP claims that the Vilina Cave itself will not be flooded. But it is obvious that the construction of a large underground dam will have serious impacts on the whole karst water system, which includes various channels whose exact routes and their links to one another are not well understood.

The technical assessment of the project by the EBRD has been quite bizarre: French consultants Tractebel were hired by the EBRD to examine the project and wrote a rather critical report saying that the project was technically risky and financially and economically unfeasible:

Undertaking the project in full, as designed at present, carries a high risk of the project not achieving its objectives. (p.9-10)

The project fails to recover both investment outlays and recurrent costs, in fact yielding a considerable cost in commercial terms… the project could only be implemented if it was heavily subsidized by the government. (p.122-123)

The report furthermore stated that the project would only make a marginal contribution to the project’s declared aim of stabilising Dubrovnik’s electricity and water supply:

As the tourist season in Dubrovnik coincides with the dry season, the impact of Ombla on the development of tourism in terms of alleviating the water shortage and power deficit in summer time can be considered as peripheral. (p.127)

When the report was leaked to Croatian media and NGOs, HEP and the EBRD responded that it was only a draft (in spite of it being labelled “final”), that once the consultant had better understood the project the issues were solved.

People following the case have not been convinced by these claims.