The Gwinnett Center, an entertainment complex near Duluth, will now be known as the Infinite Energy Center after the Florida company bought the naming rights.

Infinite Energy will pay $18 million over 20 years for the naming rights.

Lisa Anders, the executive director of Explore Gwinnett, said the board voted Friday morning in a conference call. There was no notice made of the meeting.

Earlier this year, the board outlined a master plan for the area that would add a long-discussed entertainment district to the 90-acre complex. The county commission and the Gwinnett Convention and Visitors Bureau also approved construction of a large “headquarters” hotel there in April, a Marriott with 290-300 rooms. Other nearby hotels are in the works.

The complex has a 13,000-seat arena where the Gwinnett Gladiators hockey team and Georgia Swarm lacrosse team play that will be called the Infinite Energy Arena. It also has a 50,000-square-foot exhibit hall, which will be known as the Infinite Energy Forum, and a 708-seat theater, called the Infinite Energy Theater.

The eventual plans for the complex include adding seats to the arena, doubling the size of the convention center, building a black-box theater, creating an outdoor lawn and walking trails and adding more access points to help ease traffic.

New signs will come in the fall.