Clark Engineering was requested to design a 155 kW co-generation system for the Royal Bank of Canada Building in the heart of downtown Edmonton. The combined heat and power unit provides 139 kW of electrical power to the office tower by the combustion of natural gas. By utilizing the internal combustion engines' waste heat, the co-generation unit also provides 230 kW of hydronic heating. This is used to produce domestic hot water and to heat the building in winter months. Due to the capture of waste heat, the generator has a combined efficiency of 80%. This is much greater than the efficiency of a regular electrical generator, usually getting efficiencies no higher than 30%.