Optimisation of Offshore Operations and Maintenance (O&M) Packages throughout the O&M Lifecycle

Henrik Hansen 1, Gail Clark2
1CWind, Colchester, UK, 2Global Marine, Chelmsford, UK


Offshore wind power Operations and Maintenance (O&M) has reached a critical point whereby O&M activities require additional integration to minimise expenditure and to increase efficiencies across the wind farm.  In a fast developing industry moving further from shore combined with complex weather, sea and seabed conditions, it is paramount to make the necessary contingency planning throughout the O&M lifecycle to increase operational capability. 

CWind provides a range of services that meet these needs and will present examples of how this has successfully supported clients.   It will reflect on how balance of plant services which covers; inspections, repair and maintenance and combines all of the services owners require to complement their OEM contracts in one package as well as marine logistics, turbine, cable and foundation maintenance in one bespoke solution reducing interface management time and risks, providing peace of mind to customers.

It will continue to outline the three elements of O&M work: corrective maintenance; the most costly as unpredictable and repairs have to be done at short notice hampering energy production. Condition based maintenance; when components are checked and repairs factored in accordingly and calendar based maintenance when known works are scheduled within a specific timeframe.

It will illustrate where savings can be made. ‘Condition monitoring' is a buzzword in O&M currently.  There are a number of solutions on the market.  We have pioneered a Remote Satellite system at EnBW Baltic 2 and are currently using it at Gode Wind. It has clear benefits to offer a relatively nascent industry.


CWind provided temporary power for 80 turbines during construction of 288MW EnBW Baltic 2 offshore wind farm, 32km off the Coast of Rügen Island.  As part of the package, we supplied the equipment, servicing, maintenance and refuelling. Rigging and lifting operations including demobilisation were part of our service as well as CTVs. Furthermore CWind remotely monitored and controlled the temporary power using a remote satellite system; used for the first time in offshore wind. Essentially this piece of kit can be linked to any system but in this instance was used for generator management. CWind proved successful in meeting the considerable technical and logistical challenges of handling the provision of temporary power for an offshore wind farm at greater distance from shore than previous projects.


In winter during ramp down, the system proved its worth at EnBW Baltic 2 providing cover during ice/weather periods.

There is a clear efficiency and cost benefit to outsourcing to a single integrated supplier who undertakes all three elements of corrective maintenance, condition based maintenance and calendar based maintenance and sources additional expertise and labour when required.

We undertook all elements of the project including local site management, stock management and bunkerage project managing the entire package and risk. We responded to the difficulties of working on a far shore site with limited communications, long distances and extended travel to work to monitor performance in real time and ability to stop and start systems from shore extended working in bad weather windows. 





The instant advantages gained from incorporating a remote satellite system into wind farm operations are a clear and up to date awareness of the running status across the entire field. By acting in a preventative manner rather than reactive to essentially capture faults and the resulting downtime before they occur resulting in optimising performance and improving efficiency across the wind farm. 

Since EnBW Baltic 2, we have deployed a remote satellite system on our crew transfer vessels, with the iRAMS on board automatically populating vessel's AST Planned Maintenance System. This means improved efficiency through the management and delivery of routine and planned maintenance combined with real time monitoring of a wide range of vessels data performance for example fuel burn rate and driver behaviour.


Our presentation will demonstrate how the use of new technology together with employing different smart working practices increase the operational efficiency on a wind farm and will give insight into methods and techniques which can be incorporated into service packages to reduce expenses and maximise operational ability.