The firm, which has offices in 29 countries across the globe, is headquartered in Scotland and specialises in short-term power and temperature control systems.
The £37m deal will see it provide power across 39 venues in seven different locations – London, Cardiff, Coventry, Glasgow, Manchester, Newcastle and Weymouth - using a team of 150 staff.
In addition to supporting the Opening and Closing Ceremonies, Aggreko equipment will also be used to power field-of-play lighting and camera equipment in the various stadia as well as powering the International Broadcasting Centre, which will be providing television feeds to billions of people around the world.
The company has had good grounding in Olympic events having previously worked on the Beijing 2008 Olympics and the Vancouver 2010 winter games and will also be a Tier 3 sponsor of both the Olympic and Paralympic Games.
"We look forward to supporting the Organising Committee in their task of providing faultless execution of the London Olympic Games and Paralympic games, and uninterrupted broadcasting to hundreds of millions of viewers world-wide," said Aggreko chief executive Rupert Soames.
Locog commercial director Chris Townsend added, "We are delighted to welcome Aggreko to the London 2012 family. They are coming on board as we head towards a crucial year for London 2012 – next year sees us move to becoming a fully operational organising committee, testing our venues and testing our systems."
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