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Table 2: Estimated and Actual Project Payback Analysis Pre-Construction (estimates) Post-Construction (actuals) Systemcapitalcost $184,000 $303,000 Incentives Net customer cost Electric generation Electric cost savings Maintenance costs Net annual savings Payback without incentives Payback with incentives $25,000 $159,000 396,000 kWh/yr $26,600/yr5 $3,700/yr $22,900 8.0 yrs 6.9 yrs $80,000 $223,000 480,000 kWh/yr $44,000/yr6 $4,000/yr $44,000 5.6 yrs 3.6 yrs Figure 3 illustrates the amount of on-site electrical generation compared to purchased electricity at the WWTF. Figure 3: Electric Usage at the Essex Junction WWTF 140000 120000 100000 80000 60000 40000 20000 0 Essex Junction, VT Methane CHP (monthly data) Oct 2003 - Sept 2004 utility meter turbine est. turbine metered plant total month 5 Demand rate savings were not included in original estimates to be conservative 6 Actual blended rate of electricity Oct 2003-Sept 2004 $0.09/kWh kWh Nov-03 Oct-03 Jan-04 Dec-03 Mar-04 Feb-04 May-04 Apr-04 Jul-04 Jun-04 Sep-04 Aug-04PDF Image | Turning Methane into Money: Cost-Effective Methane Co-Generation Using Microturbines at a Small, Rural Wastewater Plant
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