2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Total Apartment Heating System Stock (thousands) | 518.7 | 522.5 | 530.4 | 537.4 | 549.8 | 564.5 | 577.7 | 593.5 | 611.3 | 626.9 | 638.9 | 648.1 | 660.2 | 673.1 | 685.9 | 698.7 | 712.2 | 728.5 | |
Heating System Stock by Heating System Type (thousands) | |||||||||||||||||||
Heating Oil – Normal Efficiency | 23.0 | 20.4 | 18.0 | 15.5 | 12.8 | 10.4 | 8.3 | 6.3 | 4.1 | 3.0 | 1.5 | 0.7 | 0.8 | 0.6 | 0.6 | 0.6 | 0.4 | 0.5 | |
Heating Oil – Medium Efficiency | 10.5 | 13.0 | 14.8 | 15.6 | 17.4 | 18.9 | 20.3 | 20.7 | 20.8 | 20.9 | 21.0 | 21.3 | 21.2 | 21.3 | 21.2 | 20.9 | 20.8 | 20.2 | |
Heating Oil – High Efficiency | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
Natural Gas – Normal Efficiency | 130.7 | 123.3 | 116.0 | 107.9 | 98.3 | 88.7 | 78.4 | 69.0 | 59.8 | 50.0 | 42.1 | 34.3 | 26.8 | 19.8 | 12.8 | 6.2 | 2.0 | 0.0 | |
Natural Gas – Medium Efficiency | 103.4 | 108.4 | 116.4 | 124.9 | 134.7 | 144.8 | 153.4 | 162.2 | 169.2 | 174.9 | 175.0 | 174.3 | 173.0 | 170.1 | 166.1 | 161.0 | 154.6 | 146.7 | |
Natural Gas – High Efficiency | 59.5 | 62.7 | 68.0 | 74.1 | 81.5 | 89.7 | 96.9 | 104.5 | 116.8 | 125.7 | 134.8 | 142.1 | 150.8 | 160.6 | 171.0 | 182.0 | 191.7 | 203.7 | |
Electric | 157.6 | 158.4 | 159.4 | 160.8 | 165.2 | 171.8 | 179.0 | 188.3 | 198.9 | 210.9 | 223.0 | 234.0 | 246.4 | 259.5 | 272.9 | 286.8 | 301.3 | 315.9 | |
Heat Pump | 6.0 | 6.3 | 6.6 | 7.0 | 7.3 | 7.8 | 8.2 | 8.7 | 9.2 | 9.8 | 10.2 | 10.7 | 11.1 | 11.6 | 12.2 | 12.7 | 13.3 | 13.8 | |
Other1 | 9.4 | 9.7 | 10.0 | 10.0 | 10.1 | 10.1 | 9.9 | 9.8 | 9.7 | 9.4 | 9.0 | 8.7 | 8.3 | 8.0 | 7.6 | 7.3 | 7.0 | 6.7 | |
Wood | 15.8 | 17.5 | 18.4 | 18.6 | 19.4 | 19.2 | 20.0 | 20.6 | 19.4 | 18.8 | 18.6 | 18.3 | 18.1 | 17.8 | 17.5 | 17.3 | 17.0 | 16.7 | |
Dual Systems | |||||||||||||||||||
Wood/Electric | 1.9 | 1.9 | 2.0 | 2.0 | 2.1 | 2.1 | 2.2 | 2.2 | 2.3 | 2.3 | 2.4 | 2.4 | 2.5 | 2.5 | 2.6 | 2.6 | 2.6 | 2.7 | |
Wood/Heating Oil | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | |
Natural Gas/Electric | 0.6 | 0.6 | 0.7 | 0.7 | 0.7 | 0.8 | 0.8 | 0.8 | 0.9 | 0.9 | 1.0 | 1.0 | 1.0 | 1.1 | 1.1 | 1.1 | 1.2 | 1.2 | |
Heating Oil/Electric | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
Shares (%) | |||||||||||||||||||
Heating Oil – Normal Efficiency | 4.4 | 3.9 | 3.4 | 2.9 | 2.3 | 1.8 | 1.4 | 1.1 | 0.7 | 0.5 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | |
Heating Oil – Medium Efficiency | 2.0 | 2.5 | 2.8 | 2.9 | 3.2 | 3.3 | 3.5 | 3.5 | 3.4 | 3.3 | 3.3 | 3.3 | 3.2 | 3.2 | 3.1 | 3.0 | 2.9 | 2.8 | |
Heating Oil – High Efficiency | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
Natural Gas – Normal Efficiency | 25.2 | 23.6 | 21.9 | 20.1 | 17.9 | 15.7 | 13.6 | 11.6 | 9.8 | 8.0 | 6.6 | 5.3 | 4.1 | 2.9 | 1.9 | 0.9 | 0.3 | 0.0 | |
Natural Gas – Medium Efficiency | 19.9 | 20.7 | 21.9 | 23.2 | 24.5 | 25.7 | 26.6 | 27.3 | 27.7 | 27.9 | 27.4 | 26.9 | 26.2 | 25.3 | 24.2 | 23.0 | 21.7 | 20.1 | |
Natural Gas – High Efficiency | 11.5 | 12.0 | 12.8 | 13.8 | 14.8 | 15.9 | 16.8 | 17.6 | 19.1 | 20.0 | 21.1 | 21.9 | 22.8 | 23.9 | 24.9 | 26.0 | 26.9 | 28.0 | |
Electric | 30.4 | 30.3 | 30.1 | 29.9 | 30.0 | 30.4 | 31.0 | 31.7 | 32.5 | 33.6 | 34.9 | 36.1 | 37.3 | 38.5 | 39.8 | 41.0 | 42.3 | 43.4 | |
Heat Pump | 1.2 | 1.2 | 1.2 | 1.3 | 1.3 | 1.4 | 1.4 | 1.5 | 1.5 | 1.6 | 1.6 | 1.6 | 1.7 | 1.7 | 1.8 | 1.8 | 1.9 | 1.9 | |
Other1 | 1.8 | 1.9 | 1.9 | 1.9 | 1.8 | 1.8 | 1.7 | 1.7 | 1.6 | 1.5 | 1.4 | 1.3 | 1.3 | 1.2 | 1.1 | 1.0 | 1.0 | 0.9 | |
Wood | 3.1 | 3.3 | 3.5 | 3.5 | 3.5 | 3.4 | 3.5 | 3.5 | 3.2 | 3.0 | 2.9 | 2.8 | 2.7 | 2.6 | 2.6 | 2.5 | 2.4 | 2.3 | |
Dual Systems | |||||||||||||||||||
Wood/Electric | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | |
Wood/Heating Oil | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
Natural Gas/Electric | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |
Heating Oil/Electric | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |