Glazing potential: energy savings and CO<sub>2</sub> emission reduction

Glazing potential: energy savings and CO2 emission reduction

Potential impact of high-performance glazing on energy and CO2 savings in Europe

Glass for Europe commissioned a study on energy savings and CO2 emission avoidance of high performing glazing to the independent research institute TNO Built Environment and Geoscience (TNO).

This study is a quantification of both energy and CO2 savings that can be realised thanks to high-performance glazing across the 28 EU Member States in both horizons 2030 and 2050. In addition to full potentials, whereby all windows are equipped with high-performance glazing across all EU buildings, it also simulates the impacts of several window replacement rates, all compared to a baseline scenario.

The study draws on recent scientific sources to define input parameters such as today’s Europe building stock and performance, the evolution in the energy mix, the penetration of high-performance heating and cooling equipment, etc.

The study is based on 5 different scenarios and for each of them provides output data for the 28 countries of the EU:

  1. A 1% window replacement rate in 2020
  2. A 10-year scenario applying a 1% window replacement rate annually between 2020 and 2030
  3. A maximum saving potential by 2030
  4. A 1% window replacement rate in 2030
  5. A maximum saving potential by 2050

The below data are extracted from scenarios 2, 3 and 5 to illustrate saving potential by 2030 and 2050 and the potential linked to enhanced window renovation by 2030.

 

To receive the full study report please send your request to info@glassforeurope.com.

Download the infographic.

 

 

 

Download the brochure

Summary of the results and main findings.

NetherlandsNL Version
FranceFR Version

Annual saving potential in 2030

The below data show the amount of energy savings and related CO2 emission avoidance that could be achieved annually in 2030 if high-performance glazing were to be installed in all EU buildings. This data offers a reference point to quantify what can be achieved in the medium term, if the right measures were to be put in place.

Energy performance properties of glazing used in this scenario are based on readily available products in the EU market. Glazing have been selected to offer optimal energy performance to different building types, in seven climatic zones and taking into account facades’ orientations.

Non-residential buildings with large glazing façades are equipped with different types of solar control glazing across all climatic zones.

For residential buildings, solar control glazing is applied on all buildings’ orientations in the southern regions of Europe. In the other climatic zones, solar control glazing is used in the south orientation and several types of Low-E glazing are used on the north, west and east façades.

2030

Annual energy savings

icons-15
56614
75514
ktoe
energy
-
28
29
%

from heating

from cooling

2030

Annual CO2 emission avoidance

CO2-2
30202
94230
kt
energy3
-
16
28
%

from heating

from cooling

2030 savings: breakdown per country

More details in the table below.

Energy savings CO2 avoidance
Total Heating Cooling Total Heating Cooling
ktoe % ktoe ktoe kt % kt kt
Austria 1789 – 29 1742 47 1439 – 29 1368 71
Belgium 1664 – 32 1615 48 2868 – 31 2756 112
Bulgaria 1180 – 27 1149 31 411 – 21 306 105
Croatia 655 – 34 642 13 690 – 33 666 24
Cyprus 57 – 19 32 25 88 – 18 21 67
Czech Republic 1622 – 34 1590 32 1870 – 30 1710 160
Denmark 874 – 32 848 25 486 – 31 460 27
Estonia 390 – 39 386 4 156 – 28 132 23
Finland 1363 – 34 1327 36 420 – 29 370 50
France 9758 – 32 9474 283 9594 – 33 9561 33
Germany 17998 – 29 17527 471 26240 – 28 24215 2025
Greece 760 – 19 427 333 1655 – 18 340 1315
Hungary 1608 – 34 1576 32 2145 – 34 2112 33
Ireland 651 – 32 632 19 1193 – 31 1132 62
Italy 4134 – 19 2325 1809 8234 – 19 3184 5050
Latvia 675 – 39 668 7 340 – 37 332 8
Lithuania 1026 – 39 1016 10 498 – 38 490 8
Luxembourg 76 – 32 74 2 126 – 31 120 6
Malta 28 – 19 16 12 51 – 18 11 41
Netherlands 2643 – 32 2567 77 4019 – 31 3805 214
Poland 6073 – 34 5953 120 8525 – 30 7830 695
Portugal 754 – 19 424 330 413 – 19 221 192
Romania 3630 – 27 3534 96 3652 – 26 3497 156
Slovakia 852 – 34 835 17 1015 – 34 997 18
Slovenia 317 – 34 311 6 230 – 30 211 20
Spain 2873 – 19 1615 1257 3274 – 19 1373 1901
Sweden 2350 – 34 2128 12 222 – 30 200 22
United Kingdom 9715 – 32 9433 282 14376 – 32 14015 361
EU28 75514 – 29 70028 5486 94230 – 28 81434 12796

 

Annual saving potential in 2050

The below data show the amount of energy savings and related CO2 emission avoidance that could be achieved annually in 2050 if high-performance glazing were to be installed in all EU buildings.

This 2050 data take into account an increase of renewables in the energy mix, yet data shows that 37,4% of CO2 emissions from buildings could be saved thanks to high-performance glazing . The contribution of glazing to achieve a climate neutral Europe could be much higher while considering the uptake of products such as switchable/electrochromic glazing, glazing-integrated photovoltaics or other novel glazing technologies, which have not been considered in the this study.

 

Energy performance properties of glazing used in this scenario are based on not yet available products, whose properties have been defined by a pool of glazing experts taking into account the potential evolution of glazing performance over the next decades. Glazing have been selected to offer optimal energy performance to different building types, in seven climatic zones and taking into account facades’ orientations.

Non-residential buildings with large glazing façades are equipped with different types of solar control glazing across all climatic zones.

For residential buildings, solar control glazing is applied on all buildings’ orientations in the southern regions of Europe. In the other climatic zones, solar control glazing is used in the south orientation and several types of Low-E glazing are used on the north, west and east façades.

2050

Annual energy savings

icons-15
63942
67210
ktoe
energy
-
22
37
%

from heating

from cooling

2050

Annual CO2 emission avoidance

CO2-2
35302
68512
kt
energy3
-
6
37
%

from heating

from cooling

2050 savings: breakdown per country

More details in the table below.

Energy savings CO2 avoidance
Total Heating Cooling Total Heating Cooling
ktoe % ktoe ktoe kt % kt kt
Austria 1579 – 37 1548 31 1116 – 37 1087 29
Belgium 1518 – 42 1498 19 2397 – 41 2356 40
Bulgaria 1066 – 35 1013 54 237 – 34 200 37
Croatia 534 – 40 523 11 536 – 40 525 11
Cyprus 54 – 26 18 36 82 – 33 6 76
Czech Republic 1323 – 40 1295 28 1190 – 40 1164 26
Denmark 797 – 42 787 10 404 – 43 400 4
Estonia 316 – 45 313 3 106 – 40 101 5
Finland 1197 – 43 1166 31 268 – 41 254 14
France 8901 – 42 8789 112 7580 – 43 7554 26
Germany 15888 – 37 15576 312 20175 – 37 19667 508
Greece 725 – 26 239 486 546 – 28 150 396
Hungary 1312 – 40 1283 28 1573 – 40 1550 23
Ireland 594 – 42 586 7 829 – 42 818 11
Italy 3946 – 26 1300 2646 4929 – 27 1545 3384
Latvia 547 – 45 542 5 267 – 45 263 3
Lithuania 832 – 45 824 8 314 – 44 309 4
Luxembourg 69 – 42 68 1 102 – 40 99 2
Malta 27 – 26 9 18 60 – 33 5 55
Netherlands 2411 – 42 2381 30 3279 – 41 3222 57
Poland 4953 – 40 4847 106 5045 – 40 4921 124
Portugal 720 – 26 237 483 265 – 22 153 112
Romania 3280 – 35 3115 165 2946 – 35 2869 77
Slovakia 695 – 40 680 15 754 – 41 746 9
Slovenia 259 – 40 253 6 153 – 40 150 3
South 8214 – 26 2706 5508 7622 – 26 2529 5093
Spain 2742 – 26 903 1838 1739 – 25 670 1069
Sweden 2063 – 43 2009 53 159 – 39 147 12
United Kingdom 8862 – 42 8750 112 11462 – 42 11358 104
EU28 67210 – 37 60554 6656 68512 – 37 62290 6222

2030 annual savings thanks to a doubling of window renovation

Nearly half of the maximum saving potential identified for 2030 could be realised in 10 years by doubling the window renovation rate with high-performance glazing. This represents annual savings of 36,4 Mtoe in 2030 for the European Union. By seizing this potential of window renovation, around 20% of the EU energy efficiency objective for 2030 could be met.

To quantify these savings, a conservative 2% window replacement rate across Europe is assumed as a business as usual scenario. A doubling of building renovation, as contemplated by European institutions, means that the window replacement rate would reach 4% per year, all things being equal, and that the worst performing windows are prioritised for renovation.

Energy performance properties of glazing used in this scenario are based on readily available products in the EU market. Glazing have been selected to offer optimal energy performance to different building types, in seven climatic zones and taking into account facades’ orientations.

Non-residential buildings with large glazing façades are equipped with different types of solar control glazing across all climatic zones.

For residential buildings, solar control glazing is applied on all buildings’ orientations in the southern regions of Europe. In the other climatic zones, solar control glazing is used in the south orientation and several types of Low-E glazing are used on the north, west and east façades.

2020 - 2030

Annual savings in 2030 from doubling the window renovation rate during 10 years

icons-15
18282
36260
ktoe

from heating

from cooling

Cumulated savings over 10 years

icons-15
98746
200000
ktoe
CO2-2
198687
240000
kt of CO2