2.4. Extended economic efficiency calculation
There are different ways to calculate the economic
efficiency of measures to increase energy productivity [27].
But the existing methods do not consider impacts on LPS
target figures. The extended economic efficiency calculation
combines traditional investment calculations like the net
present value method with the information about the impact
on LPS target figures and energy intensity. Therefore, the user
of the methodology has the possibility first to weight the
target figures and then combine these weights with their
percentage changes. All figures are normalized to one single
value which represents their overall changes. Since it provides
the possibility for a consistency test based on mathematical
logic, the methodology uses the Analytic Hierarchy Process
(AHP) for this procedure [28].