1. Seventy-six percent of all electrical energy produced in this country is used to operate buildings.
2. The average residence in the U.S. consumes approximately 42.7 KBtu/SF/YR of delivered energy and the average commercial building about 85 KBtu/SF/YR.
3. Between 384 KBtu/SF/YR (Seattle) and 667 KBtu/SF/YR (Albuquerque) of solar energy is delivered free to every square foot of roof in the U.S. Between 365 KBtu/SF/YR (Seattle) and 520 KBtu/SF/YR (Albuquerque) of solar energy is delivered free to every unshaded south wall (south-facing surface) in the U.S. Or, to put it another way, between 749 KBtu/SF/YR and 1,187 KBtu/SF/YR of solar energy is delivered free to two surfaces of every building in the U.S.
new york times
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