The threat comes as the two utility giants launch a series of local consultations regarding the 2.2GW Rhiannon project, the first to be carved out of their massive Round 3 Irish Sea zone.
Separately, Dong is also engaged in consultations for a proposed 750MW extension to its existing Walney project, also in the Irish Sea.
David Cretney, the Isle of Man’s infrastructure minister, has warned the utilities that as currently planned, their wind projects could significantly lengthen the ferry routes to Great Britain, which act as a lifeblood for the island’s 85,000 people.
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