Implementing the cost-optimal methodology for near Zero Carbon Buildings
Lessons learned from three case studies
The recast Energy Performance of Buildings Directive (EPBD, 2010/31/EU) requires Member States to introduce minimum energy performance requirements for buildings, building elements and technical building systems and set these requirements based on a cost-optimal methodology. This methodology introduces – for the very first time – the prerequisite to consider the global lifetime costs of buildings to shape their future energy performance requirements. Thus, the evaluation of buildings’ requirements will no longer be related only to the investment costs, but will additionally take into account the operational, maintenance, disposal and energy saving costs of buildings, the assessment being then more consistent and sustainable.
The methodology to calculate cost-optimal levels of minimum energy performance for buildings and building elements was established on the Cost-Optimality Commission Delegated Regulation (2010/31/EU), while an additional guidance document on how to implement the methodology at the national level was published by the EU Commission in April 2012. Nevertheless, the EU regulation and guidelines provide Member States a very large degree of flexibility, regarding the selection of input data for the calculation, the reference buildings selection, energy costs, etc.
Convinced that Member States would benefit from additional guidance on the cost-optimality process and on how to use the methodology relating to nearly Zero-Energy Buildings (nZEB) requirements and long-term climate goals, Building Performance Institute Europe (BPIE) intends to provide with this report additional practical examples on how to effectively implement the cost-optimal methodology at national level. The main goal is to evaluate the implications of different critical parameters, as well as to share the good practices across EU countries. Three case studies are delivered with the support of consultants from Austria, Germany and Poland focusing on cost-optimal calculations for multi-family and / or single-family buildings. The report and case studies demonstrate how ambitious yet affordable cost-optimal energy performance requirements for buildings can be defined and how the transition towards nearly Zero-Energy Buildings (nZEBs) can be supported.
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