The firm will construct and test 72km of cabling for the onshore section of the project to the at Sutton Bridge substation.
Principal contractor Siemens Transmission & Distribution awarded the job to Murphy, which is scheduled to complete in August 2011.
The generated electricity from the 270MW wind farm will be exported via cables to a new 132kV/400kV substation adjacent to the existing National Grid substation at Walpole, Kings Lynn.
Murphy will manage the project from its Dinnington office.