The results of building a new school in Edmonton (Alberta) in accordance with energy efficient principles are described in this report, the third and last in a series describing three projects utilizing different approaches to energy conservation. The Sweet Grass Elementary School project consisted in designing, building, and monitoring an energy efficient school. The design had to be consistent with available materials and construction methods reasonably priced. A summary of earlier reports outlines how computer simulations aided in establishing the building's design parameters. The methods of monitoring and problems encountered in making an accurate survey of the energy used are discussed, followed by a lengthy description of the mechanical systems and their operation. Problems encountered in both the mechanical systems and their operation are outlined. A short discussion is given on the reactions of the school occupants. Tables and graphs show the actual meter readings outlining energy consumption, weather, and usage factors, and show the relationship between these factors and the actual energy consumed. The school used less than half the energy used by other schools of similar size in the same locality. Calculations bear out a relatively short payback period, based on present forecasts of energy costs and increases, of under 11 years. (MLF)