Balfour Beatty has delivered complex engineering works at the facility on behalf of the London Legacy Development Corporation (LLDC).
The scheme, which began in January 2014, is part of an overall regeneration project which will allow West Ham United Football Club to start using the venue later this month.
Works included installing the world's heaviest anti-gravity roof and reintegrating the lighting towers within the stadium.
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The firm reused over 6,000 metres of cable, 3,800 lights and 1,000 mechanical and electrical components for the project, as well as 19,000 tonnes of recycled demolition material.
Stephen Tarr, Managing Director of Balfour Beatty's Major Projects business, said: "From the very beginning we were focused on continuing the legacy of this historic venue, transforming it from its original use of a single-purpose venue to a multi-functional world class venue providing numerous opportunities and uses for generations to come.
"We have utilised some of the most complex engineering techniques on this project, capitalising on our in-house capabilities and expertise to ensure the project was delivered safely to a high specification whilst boosting the local economy through employment opportunities; it's a project we are all immensely proud of."
(LM/CD)
