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Wikipedia's[2] European Marine Energy Centre article says construction of the Billia Croo wave test facility was completed in October 2003, without a specific day.
Documents EMEC’s[3] 2003 establishment, the October 2003 completion of the Billia Croo wave test site, and its Orkney location.
Official EMEC page: grid-connected wave test site constructed in 2003 at Billia Croo.
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