The Scottish Government has not carried out the modelling specifically referred to in the question, however, European Directive 2002/91/EC on the energy performance of buildings required: “For new buildings with a total useful floor area over 1000 m², Member States shall ensure that the technical, environmental and economic feasibility of alternative systems such as: - decentralised energy supply systems based on renewable energy, - combined heat and power, - district or block heating or cooling, if available, - heat pumps, under certain conditions, is considered and is taken into account...