Distributed Renewable Energy Operating Impacts and Valuation Study

Solar Characterization
Table 2-12
SHW 2007 Technical Potential
Total Single-Family Homes 600,433
Fraction of Homes with Electric Water Heating 42%
Single-Family Homes with Electric Water Heating 252,182
Roof Area Needed for SHW (sq.ft./house) 49.2
Fraction of Homes where SHW is Applicable 80%
Total Roof Area Needed for SHW (million sq.ft.) 9.9
Fraction of Total Available Roof Area 3.8%
Savings per Unit (kWh) 2,105
Total Technical Potential (MWh) 424,674
Technical Potential - Commercial Sector
The key inputs used to analyze the technical potential for the commercial sector were the
estimated number of buildings per sector and square feet of roof space per building. These were
derived from the following data sources:
• APS Energy Efficiency Baseline Study 29
• DOE Commercial Buildings Energy Consumption Survey (CBECS) data 30
• APS Commercial End Use Study (EUDAP) 31
The commercial demographic results are shown below in Table 2-13.
Table 2-13
Commercial Demographics
Avg Bldg
Size
(EUDAP/
CBECS)
% of
Bldg sf
as Roof
Space
Roof
Space per
Bldg
(sf)
Energy
Use
kWh/sf
(EUDAP)
% Total
APS
System
MWh
(Baseline)
Total MWh
per sector
MWh/
Avg Bldg
Number
of
Buildings
Bldg
Demand
(W/sf)
Education 80,902 77% 62,317 14.9 11.1% 1,718,072 1,206 1,424 3.6
Small Office 4,000 51% 2,039 15.2 9.8% 1,516,856 61 24,965 4.6
Large Office 140,000 51% 71,359 27.0 14.2% 2,197,894 3,773 583 6.0
Small Retail 2,500 85% 2,135 11.7 6.0% 928,687 29 31,750 4.6
Large Retail 36,500 85% 31,177 19.7 13.4% 2,074,069 718 2,889 4.7
Large Grocery 41,600 85% 35,533 51.2 5.2% 804,862 2,129 378 8.0
Other 94,554 81% 76,410 30.0 22.3% 3,451,622 2,837 1,217 5.3
Industrial 41,000 87% 35,750 21.6 18.0% 2,786,062 887 3,140 5.7
29 ICF International, APS Energy Efficiency Baseline Study, prepared for Arizona Public Service, March 2007.
30 http://www.eia.doe.gov/emeu/cbecs/contents.html. 2003 data.
31 Quantum Consulting, Inc., APS End-Use Data Acquisition Project (EUDAP), November 1997.
Distributed Renewable Energy Operating Impacts & Valuation Study R. W. Beck, Inc. 2-35