ItalyNational

Decree for energy efficiency requirements in buildings (2015)

The Ministerial Decree 26 June 2015 completes the transposition of the European Directive EPBD 2002/91/CE, and modifies the Decree 192/2005. This legislative measure comprises three different decrees. The first one (“Application of calculation methodologies for energy performance and definition of buildings minimum requirements”) also defines the requirements of nearly zero energy buildings and set the new minimum EP and single component requirements, to enter into force starting from October 2015. A new calculation methodology for the energy performance is introduced, based on the comparison with a reference building having the characteristics set in the decree. All energy use needed to comply with the standard use of the building is included in computation of the energy performance of the building, which is referred to different classes.

In the second decree (“Reference scheme for the technical project reports to apply buildings minimum requirements”), the format for technical project reports is defined, relative to new and nearly zero energy buildings, relevant retrofitting and technical installations.

The last decree (“Upgrade of national guidelines for energy certification of buildings”) includes the national guidelines for Energy Performance Certificates (EPC), to be in force starting from October 2015. A unique information system harmonising Energy Performance Certification in the different regions was also set for all Italian regions, aimed at the management of a national registry of EPC and thermal installations, to be created by ENEA and the Regions by the end of 2015. Regions are now adopting the new guidelines in force from 1° October 2015 and those who already implemented EPBD2 have a 2 years’ period to adapt to the new national methodology.

The past rating system with 8 classes: A+ / A / B / C / D / E / F / G established on the basis of a fixed range of EP index (kWh/mq), is replaced by a new rating system based on 10 adaptable classes (A4 / A3 / A2 / A1 / B / C / D / E / F / G), based on a range proportional to the EP of a virtual reference building (identical to the real one as for geometry, orientation, location in the climatic zone, use, etc) but with predetermined thermal characteristics and energy parameters. This methodology allows calculating the boundary between Energy Performance EPgl,nr index (referred to non renewable primary energy of classes A1 e B). The rating captions of other classes are given by multiplier-reducer coefficients of EPgl,nr,Lst.

EPgl,nr considers all energy services in the building (Heating and cooling, DHW - and lighting and mobility for non-residential). When technical systems are not present in the building, the rating is found simulating the presence of heating and DHW equipments.

Each region should perform yearly a control of minimum of 2% EPCs of the total.

Applicable Building Type(s)

Existing non-residential, Existing residential, New non-residential, New residential

Policy Requirement Level

Mandatory

Policy Sequence

Governance

Development Authority: Ministry of Economic Development

Implementation Authority: Agenzia Nazionale per l'Efficienza Energetica (ENEA), Regional Authorities

Verification Authority: At regional level

Enforcement Authority: In Italy the penalty system is defined nationally, but the implementation process is regional

Prescriptive Compliance path

According to the new computation method for the energy performance of buildings, energy demand is derived for a reference building, namely a building identical to the analysed one, but with the thermal and energy characteristics defined in the Decree. The analysed building, after energy renovation, should have a total energy demand lower than the reference building. The parameters for the existing building (interested by energy requalification) are provided in order to be used for the calculation of total energy demand.

Energy Requirements:

Insulation

Reference building - Insulation

U-VALUES

(W/m2K)

FLOOR

ROOF

WALLS

2015

2019/2021

2015

2019/2021

2015

2019/2021

Climate zone A and B

0.46

0.44

0.38

0.35

0.45

0.43

Climate zone C

0.40

0.38

0.36

0.33

0.38

0.34

Climate zone D

0.32

0.29

0.30

0.26

0.34

0.29

Climate zone E

0.30

0.26

0.25

0.22

0.30

0.26

Climate zone F

0.28

0.24

0.23

0.20

0.28

0.24

 

Existing building* - Insulation

U-VALUES

(W/m2K)

FLOOR

ROOF

WALLS

2015

2021

2015

2021

2015

2021

Climate zone A and B

0.45

0.40

0.34

0.32

0.48

0.42

Climate zone C

0.40

0.36

0.34

0.32

0.42

0.38

Climate zone D

0.36

0.32

0.28

0.26

0.36

0.32

Climate zone E

0.30

0.28

0.26

0.24

0.31

0.29

Climate zone F

0.28

0.26

0.24

0.22

0.30

0.28

*interested by energy requalification 

Windows

Reference building - Windows

U-VALUES

(W/m2K)

WINDOWS

2015

2019/2021

Climate zone A and B

3.20

3.00

Climate zone C

2.40

2.20

Climate zone D

2.00

1.80

Climate zone E

1.80

1.40

Climate zone F

1.50

1.10

 

Existing building* - Windows

U-VALUES

(W/m2K)

WINDOWS

2015

2021

Climate zone A and B

3.20

3.00

Climate zone C

2.40

2.20

Climate zone D

2.00

1.80

Climate zone E

1.90

1.40

Climate zone F

1.70

1.00

*interested by energy requalification 

Air Leakage

Appendix A of the decree includes technical parameters for reference building to be used in energy performance calculations

Space Heating System

Appendix A of the decree includes technical parameters for the reference building and relative to thermal energy produced by alternative technologies; Appendix B shows technical information for heat pumps technologies which could be used for heating the energy renovated building

Space Cooling System

Appendix A of the decree includes technical parameters related to thermal energy produced by alternative technologies for the reference building and relative to thermal energy produced by alternative technologies; Appendix B shows technical information for heat pumps technologies which could be used for cooling the energy renovated building

Water Heating System

Appendix A of the decree includes technical parameters for the reference building and relative to thermal energy produced by alternative technologies;

Renewable Energy

Solar thermal energy or other renewable for water heating. Requirements also comply to the decree implementing RESD in Italy (Legislative decree No, 28/2011)

Compliance Softwares:

CTI 2000. CTI is the certifying body and the list of software certified can be accessed here:  http://www.cti2000.it/index.php?controller=sezioni&action=show&subid=34

End-uses considered:

Space cooling, Space heating, Water heating

Performance Compliance path

According to the third decree “Upgrade of national guidelines for energy certification of buldings” energy performance refers to all the energy services associated to a standard use of a building. An index of global non renewable energy performance of the analysed building, called EP, has to be calculated. The energy performance class is obtained by positioning the EP index in a predefined scale of classes, each one representing a performance level, as shown in the table.

EPgl,nren,rif,standard (2019/21)

Class

EPgl,nren,rif,standard (2019/21)

 

 A4

≤ 0.40 

0.40 <

 A3

≤ 0.60 

0.60 <

 A2

≤ 0.80 

0.80 <

 A1

≤ 1.00 

1.00 <

 B

≤ 1.20 

1.20 <

 C

≤ 1.50 

1.50 <

 D

≤ 2.00 

2.00 <

 E

≤ 2.60 

2.60 <

 F

≤ 3.50 

 

 G

> 3.50 

Energy Requirements:

End-uses considered:

Auxiliary devices, Lighting interior, Space cooling, Space heating, Water heating

Resources

Notes

Climate zones