The Olympic Delivery Authority said cost savings would be generated by awarding all four packages of work to McNicholas, by bringing a greater efficiency to the utilities programme.
Work will include construction of 6km of mains water pipes, 6.5km of gas networks, 18km of trenching and 22km of telecommunications networks.
The ODA has also appointed civil engineer contractor Barhale to develop a primary sewer and pumping station.
EDF Energy has been appointed to design and build an electrical substation which will supply electricity to the 2.5sq km Olympic Park and the Stratford City development.
ODA director of infrastructure and utilities Simon Wright said: “These utility networks and infrastructure are not just for a summer of sport in 2012 but will serve the long-term regeneration of the area for many years to come and show that we are planning Games and legacy together from the very beginning.
“The utilities networks will form the backbone of the world-class venues we will construct in the Olympic Park. Bringing first-class companies on-board to deliver this essential infrastructure is a significant step forwards and with the majority of the utilities contracts now awarded we are firmly on-track.”
Utilities contracts currently being procured are for a wind turbine and contracts to own and operate gas, water and wastewater networks serving the Olympic Park and Stratford City site.