One of the first construction projects for the 2012 Olympics was due to be awarded as Ground Engineering went to press.
The successful bidder for the contract for burying the powerlines would be announced at the end of July, according to a spokesman for the London Development Agency (LDA).
Placing power cables in a tunnel running below east London will free up land for development.
The winning contractor is expected to start on site in November. The designer of the scheme is KBR.
The LDA and Transport for London were also due to announce shortlists for Olympic Park and infrastructure designers and programme management.