1. Achievable savings in the medium to long term B .Lapillonne Enerdata
WORKSHOP 4.1
Low and very Low energy consuming buildings
ROME, 1st- 2nd October 2008
ISIS Rome
Achievable savings in the medium to long term B .Lapillonne Enerdata

2. Consensus on the existence of a large energy efficiency potentials but divergence on what is achievable
Energy efficiency potentials always seen as large … by experts, not only from a technical point view but also from an economic view point
Leading to more and more ambitious official targets of improvement…
Tapping the potential is very slow, as can be seen from present trends , ... Although a lot of policy measures have bee implemented for the last 30 years
What went wrong?
What is achievable in the medium to long term.

3. Retrofitting packages 1a/1b/1c" 150/80/60 kWh/m2
Energy efficiency potentials always seen as large: case of existing dwellings?
Different retrofitting packages to raise efficiency (e.g. insulation)
1c (or 1b) may not be cost effective depending on price, costs, payback
Not all what is cost effective is feasible (“split incentives” between owners/occupants)
New House 60 kWh/m2
Existing dwelling 250 kWh/m2 1a 1b 2 1c
Retrofitting packages 1a/1b/1c" 150/80/60 kWh/m2
Adapted from W Eichhammer Frauhofer-ISI

4. Energy efficiency potentials always seen as large: case of new dwellings? (1/2)

5. Energy efficiency potentials always seen as large: case of new dwellings (2/2)

6. ( Grenelle de l’Environnement; 2007-2008)
More and more ambitious official targets of improvement: case of official target of France in the building sector
( Grenelle de l’Environnement; )
Overall target : reduce by 38% the energy consumption in 2020
Program for new buildings :
In 2010 : 50 kWh/m2.year for all public and tertiary buildings
In 2012 : 50 kWh/m2.year for all buildings (adjusted to the geography and latitude)
In 2020 : all new buildings should be passive buildings (< 15 kWh/m2.year) or positive energy ones
Existing buildings: large thermal retrofitting program
Energy improvement for every private housing property transfer and study for a retrofitting obligation (class B or C)
Retrofitting of dwellings per year
Market exclusion of all obsolete components or technologies for electric appliances
New public buildings conformed with the best energy efficiency standards
Thermal retrofitting (-20%) of all state buildings (120 million m2)
Launching of a large professional training plan ( professionals trained in 10 years)
Financial instruments (reduced rate loans, zero rate loans, …)
Source: E Vesine, ADEME, 2008

7. Tapping the potential is very slow, as can be seen from present trends: trends in heating consumption per m2
Decrease in all countries except Bulgaria, Italy, Croatia and Greece; for southern countries part of the increase due to progress in comfort;
Only 1%/year reduction in EU-15 countries with largest decrease (e.g. The Netherlands, UK and France)
Source Odyssee

8. Drivers of the variation in heating consumption per dwelling (EU-15)
Tapping the potential is very slow, as can be seen from present trends: why?
Drivers of the variation in heating consumption per dwelling (EU-15)
Larger dwellings (+0.4 m2/year on average for the EU-15) and diffusion of central heating in the south of Europe have offset the equivalent of 70% of the energy efficiency gains
All indicators at normal climate
Source Odyssee

9. specific consumption of dwellings (2003)
Tapping the potential is very slow, as can be seen from present trends: impact of new standards in Germany : Problem of compliance and behaviours:
specific consumption of dwellings (2003)
- 30 %
Theoretical savings according to standards : 70% !
Construction year
houses: EFM / apartments MFH
Source W Eichhammer from German household survey: ISI/DIW/FfE/GfK/IfE 2003