PHOENIX - More than 500 attendees, including 125 representatives from retailers, packed the Food Marketing Institute's 27th annual Energy & Technical Services Conference, held Sept. 10-13 here at the Wigwam Golf Resort & Spa. FMI considers this its most successful educational conference, with attendance growing 25% over the past two years. No doubt rising energy costs - and the need to find cheaper sources of energy - have contributed to the interest. The conference addressed those issues, as well as others such as refrigerant conversion. Attendees cooled down at a manufacturer/retailer exchange and reception.