Everything Electric WEST will launch for the first time at Cheltenham Racecourse on June 12 and 13.
The event will showcase electric vehicles, home energy technology and sustainable living solutions.
Visitors will be able to take part in thousands of test drives and explore innovations such as solar power, battery storage and heat pumps.
The event is being supported locally by Cheltenham Borough Council through its CheltenhamZero initiative.
A dedicated business day will also offer expert sessions and insights into switching fleets to electric vehicles.
Organisers say the event will be family-friendly, with activities, live talks and well-known speakers across the weekend.