The Southwest light-rail line now has a contractor to build it and up to $435 million to start construction this winter.
The Metropolitan Council, which will build and operate the line, awarded a $799 million bid on Thursday to Lunda/C.S. McCrossan, the lone bidder left in a process that dragged on for more than a year.
"This is an exciting, big project and we're excited to be a part of it," said Brent Wilber, Lunda Construction Co.'s vice president for Minnesota.
When the council unanimously approved the contract late Thursday afternoon, those in the Robert Street chambers burst into applause.
"This is an incredible moment; after two decades of work we're finally ready to begin construction," said Alene Tchourumoff, the outgoing chair of the Met Council.

The past day or so has been a whirlwind for the often-controversial $2 billion project — the region's third light-rail line — that will link downtown Minneapolis to Eden Prairie.
The furious activity commenced once the council received word Wednesday that the Federal Transit Administration (FTA) cleared the way to begin construction of the nearly 15-mile line. The FTA issued a "letter of no prejudice," which makes early construction work on the project eligible for federal reimbursement.
The FTA is expected to pay $929 million to help build the project, with the remaining portion covered by state and local funds.