“PROSPECTS FOR OFFSHORE WIND ENERGY” A report written for the EU (Altener contract XVII/4.1030/Z/98-395) by The British Wind Energy Association (BWEA). Views or opinions contained within the report are not necessarily those of BWEA, EWEA or the Commission. Permission to reproduce any part of this document must be gained in writing from BWEA. Comments on the paper are welcomed by email to
[email protected] 1 EXECUTIVE SUMMARY Of all renewable energy technologies, offshore wind energy has possibly the most favourable combination of the key attributes of resource, energy cost and risk. The European offshore wind resource is extremely large, energy costs are cheaper than those of many other renewable technologies (but more expensive than onshore wind), and the risks are low, as the technology has already entered the demonstration phase. Studies of offshore wind energy have been in progress for around 20 years. As a result the key issues associated with the resource, the offshore environment and the necessary adaptations of wind turbine technology are all well understood. Early studies focused on the use of MW size wind turbines, frequently in large arrays, whereas early demonstration wind farms used modest numbers of specially adapted versions of commercial machines around the 500 kW mark. Although these have operated successfully and some have delivered energy in excess of expectations, they are mostly installed in relatively sheltered waters. The conditions in some of the windier regions, for example the North Sea, will be more hostile. Several studies of European resources have confirmed that most states have accessible offshore wind energy resources equal to at least 20 % of current consumption, and most have considerably more.