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Case stories


Energy savings

Energy savings over a ship's lifetime benefit efficiency and the environment 

MacGregor’s new active heave compensated 150-tonne semi-electric knuckle boom crane combines the excellent handling characteristics of this type of offshore crane with the environmental benefits offered by electric drive technology, such as the ability to regenerate electricity during lowering operations, which reduces a ship’s overall power consumption
Solutions minimising power consumption should drive development
The new crane will be used primarily in the oil and gas industry. “We have all to gain from getting the oil from the reservoirs to the end users without expending more energy than is strictly necessary. Solutions that minimise power consumption should always be the driver for development,” says Baard Trondahl Alsaker, Director MacGregor R&D and Technology. “I am sure the industry is ready to make the changes necessary to reduce costs, including investment in modern ships equipped with energy saving equipment like our new crane.
“The current downward adjustment in the oil price will be a major incentive. Forward looking industry players are likely to adapt by making changes that can sustain their business at a lower cost.”

Newly-developed semi-electric crane offers owners and operators environmental, functional and commercial benefits
MacGregor is offering its new semi electric crane with a SWL of 150 tonnes because this is currently the most popular size of crane in its market segment. The technology is generic, so other cranes will become available. The size of cranes offered will be market driven, says Mr Alsaker, noting that the bigger the crane is the more you can expect to gain from the semi-electric technology, especially as ship design will focus increasingly on integrating all power consumers in one common system to store and retrieve energy.
Regenerative capacity for lifetime savings
A major feature of the new crane is the regenerative capacity of its electric winch. Operations that involve more lowering than lifting can easily generate far more energy than they consume. But not all vessels can take full advantage of energy generated by modern electric cranes and other electrically powered equipment.
This will be very attractive to offshore operators determined to take full advantage of the energy saving potential of their new vessels. “Our clients are always concerned about minimising their operational running costs; this was a major driver in the development of our new crane. Fuel is expensive and it has a big impact on operational costs,” says Mr Alsaker. “It can take less than two years to build a vessel, but that vessel will be in service for 20 to 30 years. A little more initial capital expenditure can deliver decades of reduced operational costs.”