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Eccentric-looking they may be, but two-bladed turbines promise to offer generate at a levelised cost of energy (LCoE) that is as much as 50% lower than current offshore designs — a massive step towards making offshore wind competitive with other energy sources.
But the rapid build-out of offshore wind — far from where noise and tricks of the light might upset Nimbys — has been a game-changer. Designers are now revisiting the concept for the coming generation of 6-20MW machines, lured by lower capital costs and cheaper, faster installation — two-blade rotors can be attached to nacelles quayside and installed offshore in a single lift.
The most hopeful calculations suggest two-bladers could flow power to the grid for under £60 ($100) per MWh — far below the UK government’s 2020 target of £100/MWh, and cheaper than the €95 (£77) per MWh expected by turbine giant Siemens in 2025. Currently, traditional three-bladed offshore turbines are producing at around £130/MWh.
Ming Yang compatriot Envision, meanwhile, continues to trial a 3.6MW version of its two-bladed upwind concept — which is expected to be scaled up to an ultra-large class model — at its prototype testing site on the Danish coast, with an eye on its slow-burning home offshore market. And in Japan, Hitachi’s gigantic 20MW concept, set to be unveiled by mid-2015, is being modelled with a two-blade rotor.
Two blades cost 30% less than three, with only fractional drops in energy yields — 3% according to Aerodyn — while better-managed loads mean a less expensive nacelle and tower. The designer calculates that this could translate into a 20% LCoE advantage over three-bladed offshore machines.
By US crew Nautica’s reckoning, an LCoE below €75/MWh will be achievable by 2021-25 with floater-based technology — considerably cheaper than the current lifetime cost of a North Sea turbine.
Da geht was vorran...In 12 bis 15 Jahren sind wir bei 50E/MWh...wetten? :-)
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