MADISON, Wis. (AP) — The world's largest and longest-running energy fair is being held in central Wisconsin.

Midwest Renewable Energy Association is holding its 20th annual Energy Fair Friday June 19th through Sunday June 21st at the ReNew the Earth Institute in Custer.

It feature hundreds of workshops and exhibits emphasizing clean energy and sustainable living.

General admission for the fair is $15 each day or $35 for all three days.

A major sponsor is Madison-based Focus on Energy. It works with eligible Wisconsin residents and businesses to install cost-effective energy efficiency projects.