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� •• � 1 � � � ��3 � �� ' �7 H.Project costs/vendor quotations Estimated and/or vendor quotations of the incremental project costs will be provided.This will involve a category breakdown of the major pieces of equipmentto be installed,removed or replaced,subdivided into internal customer labor,external contractor labor,additional engineering,and equipment component costs.Also,any incremental operating and maintenance costs compared to the existing process or equipment operation should be identified. I.Financial analysis The Study will include a financial analysis according to criteria established by the customer(i.e.payback requirements,return on investment require- ments►.Xcel Energy's Summary Sheet,to be filled out with all studies,will calculate simple paybacks and applicable recommissioning rebates.This analysis takes into consideration all energy and non-energy project costs and benefits including applicable Company prescriptive rebate amounts.If the Customer has no preference,then Simple Payback should be used. The Engineering firm is responsible for calculating prescriptive rebate estimates. J.Implementation The Study is designed to provide Business Case justification and sufficient information to proceed with implementation. K.If applicable,assess cost savings from improved building power factor ratchet charges and Company's Saver's Switch program and Electric Rate Savings progam,including Time of Day and Peak-Controlled Tiers I and II. . �,. . _ ', �� The Study prepared by the engineering firm must contain the following when appropriate,in addition to A-K details. Refrigeration studies Refrigeration studies are focused on investigating feasible refrigeration systems and options and their owning and operating costs. • Consider all feasible options including ammonia,direct expansion,and combinations of both existing and new systems. • Consider optional feasible prime movers such as gas engine driven systems. • The study must identity design day,annual loads,and assumptions used. • Consider the interaction between refrigeration and HVAC systems(e.g.,space humidity) • The Study must consider the impact of feasible energy saving strategies such as waste heat recovery,variable pumping,defrost control strategies, winter free cooling,condenser options(e.g.,air,water,evaporative►,head pressure controls,subcooling,compressor strategies(e.g.,multi-stage systems)and supervisory monitoring and control systems. Cooling system replacement studies Cooling system replacement studies are focused on investigating teasible cooling systems options and their life cycle owning and operating costs. • Consider all potential feasible electric options. • Examine other options such as district cooling and thermal-driven systems,where factors such as site,load type,or other considerations make them viable. • Develop design-day cooling load profiles.Assumptions in the formulation of this data must be kept to a minimum,as the total load profile(on a 24-hour basis)is critical to the proper analysis of the options. • Consider equipment efficiencies at partial load conditions. • Calculate total ton-hours required on the design day. • Calculate cooling systems actual base caseload.In the case of once-through well water systems,the base case shall be a standard efficiency electrical cooling system. • The Study must consider the impact of energy saving strategies including,but not limited to:chilled water temperature reset,condenser water temperature reset,and chiller optimization(i.e.,multiple chi�ler systems►. • Consider the use and energy impact of premium efficient motors and adjustable speed drives where applicable. • Studies for buildings that appear suited for rooftop units only,are discouraged. �.,� �.� „ �.��°�"��'�' �� `� . , � � .w.: _ �P wf ��"*-.-x.. ��`ik�.. .��` Additional incentives for implementing identified conservation measures will be deter- � XC@�Energy� mined by Xcel Energy upon completion of the study.The incentive amounts are based on p E S P 0 N f I B l E a. N AT U R E"' Xcel Energy prescriptive,Custom Efficiency,and/or Recommissioning rebate programs. �-aoo-asi-a�oo xcelenergy.com �O 2009 Xcel Energy Inc. Xcel Energy is a registered trademark of Xcel Energy Inc. Northern States Power Company-Minnesota, an Xcel Energy Company. p.4 of 4 09-�-537 O6l2009