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Commercial Buildings Energy Consumption Survey (CBECS)

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Table C13. Total electricity consumption and expenditures, 2012

Released: May 2016

All buildings
using electricity
Electricity
consumption
Electricity
expenditures
Primary Site
  Number of buildings (thousand) Total
floorspace
(million
square feet)
Floorspace
per building
(thousand
square feet)
Total
(trillion Btu)
Total
(trillion Btu)
Total
(billion kWh)
Total
(million dollars)
All buildings 5,234 84,869 16.2 12,934 4,241 1,243 121,875
Building floorspace (square feet)              
1,001 to 5,000 2,556 7,492 2.9 1,357 445 130 13,633
5,001 to 10,000 1,171 8,489 7.3 1,179 386 113 11,977
10,001 to 25,000 852 13,565 15.9 1,655 543 159 16,682
25,001 to 50,000 326 11,672 35.8 1,549 508 149 14,549
50,001 to 100,000 195 13,604 69.9 1,996 654 192 18,473
100,001 to 200,000 90 12,362 137.8 1,974 647 190 17,507
200,001 to 500,000 37 10,652 284.1 1,876 615 180 16,706
Over 500,000 8 7,033 887.8 1,349 442 130 12,347
Principal building activity              
Education 389 12,239 31.5 1,396 458 134 12,893
Food sales 177 1,252 7.1 634 208 61 5,719
Food service 380 1,819 4.8 850 279 82 8,070
Health care 157 4,155 26.5 1,114 365 107 9,585
Inpatient 10 2,374 247.8 766 251 74 6,435
Outpatient 147 1,781 12.1 348 114 33 3,150
Lodging 158 5,826 36.9 928 304 89 8,498
Mercantile 599 11,320 18.9 2,151 705 207 20,016
Retail (other than mall) 435 5,430 12.5 857 281 82 8,144
Enclosed and strip malls 164 5,890 35.9 1,293 424 124 11,872
Office 1,012 15,952 15.8 2,637 865 253 26,240
Public assembly 352 5,559 15.8 837 275 80 7,889
Public order and safety 84 1,440 17.2 223 73 21 2,038
Religious worship 412 4,557 11.1 247 81 24 2,513
Service 602 4,512 7.5 389 127 37 4,121
Warehouse and storage 675 12,568 18.6 866 284 83 8,442
Other 123 1,972 16.1 581 191 56 5,041
Vacant 116 1,699 14.6 80 26 8 809
Year constructed              
Before 1920 337 3,800 11.3 332 109 32 3,515
1920 to 1945 458 5,866 12.8 668 219 64 7,279
1946 to 1959 554 7,208 13.0 884 290 85 8,455
1960 to 1969 609 10,198 16.7 1,531 502 147 14,326
1970 to 1979 651 10,556 16.2 1,776 582 171 16,021
1980 to 1989 856 14,791 17.3 2,431 797 234 22,843
1990 to 1999 762 13,118 17.2 2,217 727 213 20,479
2000 to 2003 370 7,193 19.4 1,159 380 111 10,673
2004 to 2007 341 6,485 19.0 1,008 330 97 9,561
2008 to 2012 296 5,653 19.1 926 304 89 8,723
Census region and division              
Northeast 770 15,291 19.9 2,293 752 220 25,123
New England 285 4,192 14.7 526 172 51 6,501
Middle Atlantic 485 11,099 22.9 1,767 579 170 18,622
Midwest 1,171 18,560 15.8 2,595 851 249 21,717
East North Central 706 12,544 17.8 1,815 595 174 15,676
West North Central 466 6,016 12.9 780 256 75 6,040
South 2,086 33,026 15.8 5,518 1,809 530 47,473
South Atlantic 1,020 17,608 17.3 2,983 978 287 27,244
East South Central 354 4,824 13.6 735 241 71 6,225
West South Central 712 10,594 14.9 1,800 590 173 14,004
West 1,207 17,992 14.9 2,528 829 243 27,563
Mountain 316 4,812 15.2 698 229 67 6,224
Pacific 891 13,180 14.8 1,831 600 176 21,339
Climate region1              
Very cold/Cold 1,929 31,286 16.2 4,363 1,430 419 40,072
Mixed-humid 1,637 27,422 16.8 4,324 1,418 415 39,376
Mixed-dry/Hot-dry 791 11,743 14.9 1,586 520 152 18,349
Hot-humid 740 12,002 16.2 2,294 752 220 20,169
Marine 138 2,416 17.5 367 120 35 3,910
Number of floors              
One 3,555 38,053 10.7 5,676 1,861 545 53,981
Two 1,128 19,928 17.7 2,696 884 259 25,383
Three 365 8,102 22.2 1,139 373 109 11,014
Four to nine 175 13,417 76.8 2,402 788 231 21,425
Ten or more 12 5,368 429.7 1,021 335 98 10,072
Elevators and escalators
(more than one may apply)
             
Any elevators 401 31,942 79.6 5,612 1,840 539 51,427
Number of elevators              
One 269 11,120 41.4 1,528 501 147 13,724
Two to five 117 12,712 108.9 2,315 759 222 21,044
Six or more 16 8,109 507.6 1,769 580 170 16,659
Any escalators 10 3,641 377.0 689 226 66 6,294
Number of workers (main shift)              
Fewer than 5 2,570 15,530 6.0 1,390 456 134 13,812
5 to 9 1,084 8,970 8.3 1,163 381 112 11,619
10 to 19 731 9,623 13.2 1,375 451 132 13,555
20 to 49 513 14,514 28.3 2,287 750 220 21,239
50 to 99 206 13,476 65.6 2,228 730 214 20,070
100 to 249 93 10,941 117.1 1,928 632 185 17,630
250 or more 37 11,815 318.3 2,562 840 246 23,951
Weekly operating hours              
Fewer than 40 941 6,548 7.0 364 119 35 3,740
40 to 48 1,325 15,737 11.9 1,609 527 155 16,051
49 to 60 1,229 20,425 16.6 2,482 814 238 24,484
61 to 84 744 15,800 21.2 2,591 850 249 25,240
85 to 167 466 9,364 20.1 2,081 682 200 18,906
Open continuously 529 16,994 32.1 3,806 1,248 366 33,454
Ownership and occupancy              
Nongovernment owned 4,480 65,620 14.6 10,278 3,370 988 97,696
Owner occupied 2,395 30,321 12.7 4,739 1,554 455 43,284
Leased to tenant(s) 1,675 25,809 15.4 4,143 1,358 398 41,062
Owner occupied and leased 344 8,820 25.7 1,379 452 132 13,162
Unoccupied 66 670 10.2 18 6 2 189
Government owned 755 19,248 25.5 2,656 871 255 24,179
Federal 33 1,573 47.7 236 77 23 2,246
State 183 5,522 30.2 839 275 81 7,242
Local 538 12,153 22.6 1,580 518 152 14,691
Party responsible for operation
and maintenance of energy
systems
             
Building owner 4,414 71,663 16.2 10,710 3,512 1,029 99,912
Business owner or tenant 705 11,134 15.8 1,892 620 182 18,634
Property management 53 1,245 23.7 192 63 18 1,892
Other 63 827 13.1 139 46 13 1,437
Provider of direct input on energy-
related equipment purchases
             
Building owner 4,566 74,147 16.2 11,045 3,621 1,061 103,452
Business owner or tenant 529 8,161 15.4 1,479 485 142 14,356
Property management 35 880 25.5 123 40 12 1,306
Other 105 1,681 16.0 287 94 28 2,762
Number of establishments              
One 4,079 54,485 13.4 8,087 2,651 777 75,573
2 to 5 862 17,756 20.6 2,588 849 249 24,651
6 to 10 136 4,313 31.8 733 240 70 6,963
11 to 20 66 3,675 55.4 713 234 69 6,982
More than 20 19 3,795 203.0 794 260 76 7,499
Currently unoccupied 72 845 11.8 19 6 2 208
Predominant exterior wall material              
Brick, stone, or stucco 2,215 39,609 17.9 6,206 2,035 596 58,369
Concrete (block or poured) 1,076 20,404 19.0 3,357 1,101 323 31,422
Concrete panels 200 8,447 42.2 1,254 411 121 11,673
Siding or shingles 845 5,565 6.6 743 244 71 7,747
Metal panels 823 8,055 9.8 823 270 79 7,509
Window glass 17 1,340 78.6 326 107 31 2,997
Other 37 856 23.0 143 47 14 1,384
No one major type 21 592 27.6 81 26 8 774
Predominant roof material              
Metal surfacing 1,511 15,024 9.9 1,758 576 169 16,412
Synthetic or rubber 891 25,614 28.8 4,391 1,440 422 40,442
Built-up 790 21,306 27.0 3,508 1,150 337 32,582
Slate or tile shingles 382 4,222 11.1 610 200 59 6,335
Wooden materials (including
shingles)
147 1,105 7.5 144 47 14 1,508
Asphalt, fiberglass, or
other shingles
1,422 14,679 10.3 2,045 670 196 20,026
Concrete 50 1,584 31.5 311 102 30 2,971
Other 24 678 28.6 111 36 11 1,042
No one major type 18 657 36.4 55 18 5 557
Roof characteristics              
Roof tilt              
Flat 1,872 48,745 26.0 8,320 2,728 799 77,289
Shallow pitch 1,993 23,019 11.5 3,103 1,017 298 29,573
Steeper pitch 1,369 13,104 9.6 1,511 495 145 15,013
Cool roof 718 19,379 27.0 3,381 1,108 325 31,151
Renovations in buildings
constructed before 2008
(more than one may apply)
             
Any type of renovation 2,045 41,912 20.5 6,747 2,212 648 62,883
Addition or annex 439 12,969 29.5 2,129 698 205 18,928
Reduction in floorspace 66 1,733 26.4 370 121 36 3,164
Roof replacement 956 20,766 21.7 3,429 1,124 329 31,469
Exterior wall replacement 188 4,221 22.5 731 240 70 6,509
Interior wall reconfiguration 877 21,250 24.2 3,709 1,216 356 34,504
Window replacement 557 12,251 22.0 1,832 601 176 17,416
HVAC equipment upgrade 1,085 26,648 24.6 4,504 1,477 433 41,872
Lighting upgrade 969 25,414 26.2 4,264 1,398 410 39,493
Electrical upgrade 737 16,087 21.8 2,753 903 265 25,680
Plumbing system upgrade 634 13,807 21.8 2,311 758 222 22,025
Insulation upgrade 378 7,553 20.0 1,309 429 126 11,754
Fire, safety, or security upgrade 610 17,163 28.1 2,936 963 282 27,572
Structural upgrade 150 3,911 26.0 716 235 69 6,435
Other 39 848 21.7 135 44 13 1,332
No renovations 2,894 37,304 12.9 5,261 1,725 506 50,269
Buildings constructed 2008 or later 296 5,653 19.1 926 304 89 8,723
Energy sources
(more than one may apply)
             
Electricity 5,234 84,869 16.2 12,934 4,241 1,243 121,875
Natural gas 2,933 58,725 20.0 9,400 3,082 903 87,843
Fuel oil 467 20,200 43.3 3,973 1,303 382 36,349
District heat 48 5,964 124.9 1,076 353 103 9,745
District chilled water 54 4,608 85.4 890 292 86 7,279
Propane 507 7,686 15.2 1,148 376 110 10,822
Other 167 3,801 22.7 518 170 50 5,171
Space-heating energy sources              
Electricity 2,858 49,030 17.2 8,057 2,642 774 74,674
Electricity main 1,819 26,205 14.4 4,573 1,499 439 42,062
Electricity secondary 1,039 22,826 22.0 3,484 1,142 335 32,612
Other excluding electricity 1,859 31,022 16.7 4,407 1,445 423 42,010
Buildings without heating 517 4,816 9.3 470 154 45 5,191
Primary space-heating
energy source
             
Electricity 1,819 26,205 14.4 4,573 1,499 439 42,062
Natural gas 2,322 42,988 18.5 6,359 2,085 611 60,323
Fuel oil 205 2,542 12.4 247 81 24 2,588
District heat 47 5,797 122.9 1,053 345 101 9,569
Propane 261 1,948 7.5 186 61 18 1,629
Other 62 573 9.2 48 16 5 515
Cooling energy sources              
Electricity 4,413 76,034 17.2 12,061 3,954 1,159 114,058
Other excluding electricity 48 3,260 67.6 587 193 56 4,721
Buildings without cooling 773 5,575 7.2 285 94 27 3,097
Water-heating energy sources              
Electricity 2,658 42,755 16.1 6,755 2,215 649 63,203
Other excluding electricity 1,765 36,261 20.5 5,832 1,912 560 54,880
Buildings without water heating 811 5,853 7.2 347 114 33 3,793
Cooking energy sources              
Electricity 1,010 25,151 24.9 4,720 1,547 454 43,196
Other excluding electricity 579 13,395 23.2 2,569 842 247 24,055
Buildings without cooking 3,645 46,322 12.7 5,645 1,851 542 54,624
Energy end uses
(more than one may apply)
             
Buildings with space heating 4,717 80,053 17.0 12,464 4,086 1,198 116,684
Buildings with cooling 4,461 79,294 17.8 12,648 4,147 1,215 118,778
Buildings with water heating 4,423 79,015 17.9 12,587 4,127 1,209 118,083
Buildings with cooking 1,589 38,546 24.3 7,289 2,390 700 67,252
Buildings with manufacturing 259 5,078 19.6 695 228 67 6,660
Buildings with electricity
generation
410 25,642 62.5 5,102 1,673 490 46,125
Percent of floorspace heated              
Not heated 517 4,816 9.3 470 154 45 5,191
1 to 50 696 10,114 14.5 1,019 334 98 10,362
51 to 99 725 14,645 20.2 2,433 798 234 23,586
100 3,297 55,293 16.8 9,011 2,955 866 82,737
Percent of floorspace cooled              
Not cooled 773 5,575 7.2 285 94 27 3,097
1 to 50 1,173 18,891 16.1 1,592 522 153 16,076
51 to 99 897 22,728 25.3 3,968 1,301 381 37,758
100 2,391 37,676 15.8 7,089 2,324 681 64,944
Percent lit when open              
Zero 70 322 4.6 11 3 1 118
1 to 50 1,099 12,628 11.5 1,184 388 114 11,323
51 to 99 1,666 34,814 20.9 5,469 1,793 526 51,668
100 2,222 35,726 16.1 6,237 2,045 599 58,426
Building never open/electricity
not used
178 1,378 7.8 33 11 3 341
Percent lit during off hours              
Zero 2,489 24,746 9.9 2,412 791 232 25,350
1 to 50 2,441 50,753 20.8 8,159 2,675 784 75,923
51 to 100 202 6,926 34.3 1,715 562 165 14,834
Building always open with
no "off hours"
102 2,443 23.9 648 213 62 5,768
Electricity not used N N N N N N N
Heating equipment
(more than one may apply)
             
Heat pumps 628 11,846 18.9 1,870 613 180 17,577
Furnaces 755 8,654 11.5 1,106 363 106 10,424
Individual space heaters 1,246 20,751 16.7 2,824 926 271 26,694
District heat 48 5,925 124.3 1,068 350 103 9,679
Boilers 543 22,438 41.3 3,640 1,193 350 34,078
Packaged heating units 2,802 49,188 17.6 8,028 2,632 771 74,368
Other 60 1,570 26.2 399 131 38 3,363
Cooling equipment
(more than one may apply)
             
Residential-type central air
conditioners
1,546 14,765 9.5 1,941 636 186 19,238
Heat pumps 692 12,538 18.1 1,966 644 189 18,431
Individual air conditioners 709 12,420 17.5 1,665 546 160 16,454
District chilled water 54 4,608 85.4 890 292 86 7,279
Central chillers 163 17,041 104.6 3,417 1,120 328 30,834
Packaged air conditioning units 1,909 45,153 23.6 7,563 2,480 727 71,017
Swamp coolers 109 1,918 17.5 299 98 29 2,961
Other Q 328 Q 98 32 9 887
Main equipment replaced since
1990 (more than one may apply)
             
Heating 1,874 27,558 14.7 4,035 1,323 388 38,203
Cooling 1,971 30,702 15.6 4,633 1,519 445 44,610
Water-heating equipment              
Centralized system 3,348 47,534 14.2 7,577 2,484 728 70,903
Distributed system 690 12,688 18.4 1,643 539 158 16,481
Combination of centralized and
distributed system
385 18,793 48.8 3,367 1,104 324 30,698
Lighting equipment types
(more than one may apply)
             
Incandescent 1,826 38,406 21.0 6,366 2,087 612 58,067
Standard fluorescent 4,649 80,081 17.2 12,461 4,085 1,197 116,985
Compact fluorescent 2,302 53,816 23.4 9,254 3,034 889 85,737
High-intensity discharge (HID) 525 23,396 44.5 3,976 1,303 382 36,217
Halogen 905 28,059 31.0 4,977 1,632 478 45,983
LED 473 22,071 46.6 4,318 1,416 415 40,018
Other 10 446 45.2 99 33 10 878
Refrigeration equipment
(more than one may apply)
             
Any refrigeration 3,984 73,645 18.5 11,964 3,923 1,150 111,805
Walk-in units 811 28,361 35.0 6,309 2,069 606 57,455
Cases or cabinets 915 28,719 31.4 6,061 1,987 582 55,957
Large cold storage areas 78 4,171 53.4 1,019 334 98 9,056
Commercial ice makers 846 32,734 38.7 6,796 2,228 653 61,035
Residential-type or compact units 3,388 62,381 18.4 9,482 3,109 911 88,731
Vending machines 960 43,936 45.8 7,723 2,532 742 70,214
No refrigeration 1,250 11,224 9.0 970 318 93 10,070
Office equipment
(more than one may apply)
             
Desktop computers 3,977 77,063 19.4 12,252 4,017 1,177 114,933
With flat screen monitors 3,847 76,160 19.8 12,130 3,977 1,166 113,832
With multiple monitors 911 30,946 34.0 5,445 1,785 523 50,411
Laptop computers 2,730 63,486 23.3 10,073 3,303 968 94,088
Dedicated servers 1,748 53,369 30.5 9,041 2,964 869 84,019
Laser printers 2,339 54,256 23.2 8,910 2,921 856 83,064
Inkjet printers 2,187 36,235 16.6 5,449 1,787 524 52,214
FAX machines 3,185 66,682 20.9 10,712 3,512 1,029 100,207
Photocopiers 2,163 59,277 27.4 9,451 3,099 908 88,288
Number of desktop computers              
None 1,258 7,806 6.2 681 223 65 6,943
1 to 4 2,039 15,669 7.7 2,134 700 205 20,849
5 to 9 821 9,422 11.5 1,391 456 134 13,152
10 to 19 482 9,388 19.5 1,344 441 129 13,203
20 to 49 355 13,094 36.9 2,185 716 210 20,062
50 to 99 143 8,284 57.8 1,244 408 120 11,748
100 to 249 92 9,728 105.6 1,663 545 160 14,675
250 or more 44 11,478 258.3 2,292 751 220 21,243
Number of laptop computers              
None 2,504 21,382 8.5 2,860 938 275 27,787
1 to 4 1,944 21,161 10.9 2,837 930 273 27,026
5 to 9 350 8,345 23.9 1,314 431 126 12,044
10 to 19 181 8,343 46.0 1,358 445 131 12,884
20 to 49 144 9,643 67.2 1,603 525 154 14,733
50 to 99 58 5,234 91.0 889 292 85 8,429
100 to 249 35 5,217 150.9 939 308 90 8,261
250 or more 20 5,542 280.8 1,134 372 109 10,710
Number of dedicated servers              
None 3,486 31,499 9.0 3,893 1,276 374 37,856
1 to 4 1,562 34,097 21.8 5,170 1,695 497 48,512
5 to 9 97 6,241 64.3 1,048 343 101 9,574
10 to 19 50 5,711 113.6 1,137 373 109 10,592
20 to 49 25 3,758 147.4 730 239 70 6,538
50 or more 13 3,562 271.4 956 313 92 8,803
Number of photocopiers              
None 3,071 25,592 8.3 3,483 1,142 335 33,587
One 1,325 17,080 12.9 2,233 732 215 21,199
2 to 4 648 20,312 31.4 3,044 998 293 28,580
5 to 9 116 8,863 76.7 1,501 492 144 13,456
10 or more 75 13,022 174.7 2,673 876 257 25,054
Number of TVs or video displays              
None 2,395 22,115 9.2 2,328 763 224 23,257
One 1,145 9,990 8.7 1,256 412 121 11,897
2 to 4 1,035 16,465 15.9 2,455 805 236 24,096
5 to 9 314 8,148 25.9 1,562 512 150 14,468
10 to 19 154 8,168 53.1 1,526 500 147 13,430
20 to 49 106 8,058 76.1 1,452 476 140 13,521
50 to 99 48 4,378 90.9 805 264 77 7,071
100 or more 37 7,547 201.5 1,550 508 149 14,136
Food preparation or serving areas
in non-food service buildings
(more than one may apply)
             
Snack bar or concession stand 153 9,884 64.6 1,986 651 191 18,136
Fast food or small restaurant 173 9,787 56.5 2,334 765 224 21,235
Cafeteria or large restaurant 130 15,222 117.1 2,714 890 261 24,625
Commercial kitchen/
food preparation area
282 16,150 57.2 3,038 996 292 27,221
Small kitchen area 736 14,054 19.1 2,113 693 203 19,739
Separate computer areas
(more than one may apply)
             
Data center or server farm 97 11,105 115.1 2,481 814 238 22,702
Computer-based training room 244 17,723 72.7 3,119 1,022 300 28,326
Student or public computer center 238 14,341 60.1 2,112 692 203 18,779
HVAC conservation features
(more than one may apply)
             
Economizer cycle 601 30,749 51.2 5,609 1,839 539 51,308
Regular HVAC maintenance 3,178 69,244 21.8 11,536 3,782 1,108 107,543
Building automation system (BAS)2 781 37,051 47.5 6,971 2,285 670 63,815
Window and interior lighting
features (more than one may
apply)
             
Multipaned windows 2,959 59,730 20.2 9,682 3,174 930 89,208
Tinted window glass 1,843 44,399 24.1 7,476 2,451 718 68,961
Reflective window glass 543 15,837 29.1 3,127 1,025 300 28,594
External overhangs or awnings 1,845 32,062 17.4 5,716 1,874 549 52,842
Skylights or atriums 581 22,076 38.0 3,450 1,131 332 31,935
Light scheduling 918 30,263 33.0 5,632 1,847 541 53,018
Occupancy sensors 813 35,871 44.1 6,333 2,076 609 58,844
Multi-level lighting or dimming 349 14,534 41.7 2,834 929 272 26,331
Daylight harvesting 125 6,114 48.8 1,133 371 109 10,563
Demand responsive lighting 176 4,738 26.9 830 272 80 8,365
Building automation system (BAS) for lighting2 208 12,068 57.9 2,488 816 239 23,034
Equipment usage reduced when
building not in full use
(more than one may apply)
             
Heating 3,696 63,147 17.1 9,290 3,046 893 88,705
Cooling 3,517 62,516 17.8 9,387 3,078 902 89,825
Lighting 4,757 78,594 16.5 11,833 3,880 1,137 111,970
Annual consumption
(kilowatthours)
             
10,000 or less 773 3,084 4.0 42 14 4 574
10,001 to 50,000 1,881 10,502 5.6 519 170 50 6,062
50,001 to 100,000 865 7,602 8.8 648 213 62 6,932
100,001 to 500,000 1,261 21,313 16.9 2,942 964 283 29,318
500,001 to 1,000,000 238 10,050 42.2 1,714 562 165 16,029
1,000,001 to 5,000,000 188 20,739 110.1 3,944 1,293 379 35,863
Over 5,000,000 28 11,578 411.7 3,124 1,024 300 27,099
               
1These climate regions were created by the Building America program, sponsored by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE).
2In earlier CBECS publications, BAS was referred to as Energy Management and Control System (EMCS).
Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 20 buildings were sampled.
N = No cases in reporting sample.
Notes: • Because of rounding, data may not sum to totals. •See the
Guide to the 2012 CBECS Detailed Tables or CBECS Terminology for definitions of terms used in these tables and/or comparison of differences with prior CBECS tables. Both references can be accessed from http://www.eia.gov/consumption/commercial/data/2012/ • Site electricity is the amount of electricity delivered to commercial buildings. Primary electricity, which is not included in the Total of major fuelscategory, is site electricity plus the conversion losses in the generation, transmission, and distribution processes. • Statistics for the Energy end uses category represent total consumption in buildings that have the end use, not consumption specifically for that particular end use. • HVAC = Heating, ventilation, and air conditioning.
Source: U.S. Energy Information Administration, Office of Energy Consumption and Efficiency Statistics, Forms EIA-871A and E of the 2012 Commercial Buildings Energy Consumption Survey.