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Solar PV Expansion Savings <br />Assumptions <br />The NREL intemct-based program "PVWatts" (http://pvwatts.nrel.gov/pvwatts.php) is used to determine hourly system <br />output for Boulder, Colorado. <br />PVWatts assumes that the photovoltaic cells are crystalline silicon. <br />The AC power output is assumed to be 85% of the nameplate DC power rating. This includes a 5% derate factor for <br />lifetime cell degradation. <br />Excess power can be sold back to the utility at the retail rate. <br />A. General Data for Baseline and Proposed Operation <br />1 Electric consumption rate (ECR) $0.05700 /kW-hr From Honeywell utility bill analysis <br />2 Electric demand rate (EDR) $12.00 /kW From Honeywell utility bill analysis <br />B. Baseline Operation <br />1 Facility electric energy consumption and demand <br />Month <br />Electric <br />Energy Cons, <br />kWh <br />Electric <br />Demand, kW <br />September <br />95,735 <br />234 <br />October <br />87,560 <br />270 <br />November <br />136,388 <br />334 <br />December <br />163,648 <br />390 <br />Januaa <br />190,751 <br />408 <br />February <br />141,298 <br />342 <br />March <br />97,262 <br />294 <br />April <br />82,511 <br />260 <br />May <br />82,012 <br />178 <br />June <br />84,434 <br />206 <br />July <br />80,744 <br />186 <br />August <br />84,540 <br />203 <br />Annual Totals <br />1,316,883 <br />3,305 <br />From Honeywell utility bill analysis <br />3.22 <br />