42 Scientific and technological advisory and consultancy services relating to power supply and power usage; scientific and technological advisory and consultancy services to power generation and power supply companies; scientific and technological advisory and consultancy services relating to the distribution, generation, supply and usage of electricity; scientific and technological advisory and consultancy services relating to monitoring, managing and/or responding to fluctuations in the supply of electricity; scientific and technological advisory and consultancy services to the designers and manufacturers of devices and equipment that consume electrical power, including electrical appliances, machinery and plant; design, installation, maintenance and updating of computer software, and advisory and consultancy services relating thereto; installation, maintenance and repair services relating to computer software for adjusting or controlling power usage or electrical load; installation, maintenance and repair services relating to computer software for monitoring, managing and/or responding to fluctuations in the supply of electricity; research and development services relating to apparatus, instruments and computer software for adjusting or controlling power usage or electrical load