WTUI is a membership organization of GE LM2500, LM5000, LM6000, and LMS100 users, manufacturers, and suppliers. The organization is a California corporation funded through annual membership and conference fees. WTUI was founded in 1990 and has approximately 80 power plant facilities and represents over 100 suppliers. OEMs and suppliers support WTUI through their participation in the annual conference and in technical discussions.