Fibre Broadband is the efficient choice
Fibre uses far less energy than traditional copper by transmitting data using light. Full fibre networks are passive and don't need constant power to operate, unlike electric copper networks. The light technology used allows fibre to use under 1 watt to send data over 300 meters, compared to the 3.5 watts consumed by coaxial cables to carry data a mere 100 meters. Energy creates heat, so networks must be kept cool in all areas to prevent overheating, this is less of an issue with Fibre.