This category was added to the Wiki-Solar Database later than most of the other roles, so there is less data available, and these rankings may be less reliable than others in this section of the website (see notes below right).
This list is based on the figures available in the third quarter of 2019.
What is an O&M contractor?
The Operations and Maintenance contractor is appointed by the owner to oversee the technical operation of the plant.
This includes routine maintenance and cleaning, and whatever unscheduled fault finding may be required in order to optimise the output of the installation.
Because the EPC contractor has been responsible for the detailed design and construction, it is often the party best able to continue into the operational phase, and many EPC contractors go on to under-take the operation and maintenance role. Addition-ally a number of specialist independent O&M contractors have emerged
Depending on the size and complexity of the project the O&M role may require permanent onsite staff; or may be fulfilled remotely with periodic site visits.
Basis of the data used
The data used for the analysis and the table on the left is derived from operating projects of 4MWAC+ on the Wiki-Solar Database, according to these criteria.
O&M contractors are identified against 10.2% of the operating capacity on the Wiki-Solar Database (of which these top 29 account for 9.6%). The total capacity for O&M contractors listed may therefore be on average up to 10 times that identified here (though some do confirm details of their portfolio to Wiki-Solar).
Some contractors listed also fulfil other roles in utility-scale projects, and many are also EPC contractors. Any figures quoted here apply only to their O&M activities. Where companies have maps, however, these will show all their projects.