Energy efficiency is the result of optimizing energy consumption to achieve certain levels of comfort and service, either by adjusting electricity consumption or implementing mechanisms to save energy while avoiding losses during the process. For example, by using electric and hybrid vehicles with emissions of no more than 75 gr-CO2/km, bicycles and electric scooters (with and without a motor), type A+, A++ or A+++ (formerly rated between A+++ and D) and A, B or C (new rating from A to G) appliances, lighting systems with LED technology, heating and hot water systems that use condensation or biomass boilers and A+, A++ or A+++ (formerly rated between A+++ and D) and A, B or C (new rating between A and G) heat pumps, automatic systems to turn devices on and off, presence detection devices to turn on lighting, wall insulation systems, replacing windows, installing electric vehicle charging points and using solar panels for self-supply.