This work focuses on estimating the electrical energy consumption of household appliances, and it does so with two methods. The first method presented aims to estimate the energy consumption of an appliance from technical sheet data and energy class. The objective is to provide Midori with a model to calculate the energy consumption of an appliance starting from the least possible number of inputs obtained from a customer survey. The appliances for which models have been obtained are fridges, freezers, washing machines, washer-dryers, tumble dryers, dishwashers, televisions, electric water heaters and heat pumps. The models obtained have been tested against unseen appliances to validate the results and are now being used by Midori to provide energy consultancy services to its customers.