Danish renewables giant Orsted has chartered three innovative hybrid crew transfer vessels (CTVs) that could run on hydrogen in the future.
Shipowners Northern Offshore Services (NOS) and MHO-Co ordered the units last year.
They have now been taken by Orsted to work on its new Hornsea Two offshore wind farm off north-eastern England.
NOS will take delivery of the 39-metre Energizer this spring, while Denmark's MHO-Co will receive its two 35-metre vessels in the summer.