So no pressure then for Acquamarine, the Edinburgh-based wave pioneer whose Oyster 800 giant hinge is one of the most promising of the contraptions under development. A martyr to teething troubles caused by component failures, Oyster is now enjoying a good summer of tests in the turbulent near-shore waters off Orkney.
Chief executive Martin O'Neill, who has been admirably open about setbacks, reports "impressive power production figures" culminating in the generation of 1MWh in nine hours, though short of a constitution-changing breakthrough.
"Our power production and availability figures have been lower than they could be, but it is important to take a measured, long-term view ... we plan to restart the improved Oyster 800 in the autumn.
"There is still a long way to go, but we are now making significant steps towards having a commercially available wave energy machine," he added.