McNicholas was today awarded the contracts for installing water, gas, electrical and telecoms networks in the Olympic Park site in east London.
The other contract to be awarded by the Olympic Delivery Authority (ODA) today went to Barhale Construction to design and build a primary sewer and pumping station.
ODA infrastructure and utilities director 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."
In full, the utilities contracts that have been awarded are:
Primary Sewer and Pumping Station
The design and construction of 1.8km of a 1.2m diameter tunnel connected to a pumping station that will collect, convey and discharge foul flows from the main venues and buildings in the Olympic Park in Games-time, and from the legacy venues and residential developments after 2012.
Water - The design and construction of a mains water network within the Olympic Park comprising of approximately 6km of pipe work and associated equipment.
Gas Networks - The design and construction of 6.5km of gas networks within the Olympic Park.
Electrical Civils - The construction and installation of approximately 18km of trenching, civils and ducts for high voltage electrical cables to connect the primary electrical substation in the Olympic Park to local substations in venues and buildings.
Telecoms Ducts - The design and construction of approximately 22km of telecommunication duct networks allowing the installation of fibre optic and data cabling during the Games and providing key connections for legacy developments.