37 Building construction, repair, maintenance, and installation services; engineering services, namely turnkey engineering, installing, commissioning, refurbishing, rebuilding, repairing, overhauling and maintenance services related to power stations, electricity generating stations, landfill and sewage gas installations, engines, air and gas compressors, energy plants, and electricity generators; operation and management of energy apparatus, instruments and installations; and provision of advice, consultancy and information relating to the foregoing