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11 /6/2007 <br />WPCP OPERATION <br />USING CO -GENERATION <br />o Methane gas is produced as <br />part of the digester process <br />o Gas production can be <br />enhanced by accepting <br />grease from restaurants, etc. <br />I� <br />o Grease receiving is a new <br />revenue source ($30k/yr) 1 <br />o Gas is supplied to the <br />digester boilers <br />- <br />o Gas is supplied to <br />generators, which produces <br />—50% <br />electricity replacing of^ <br />PG&E supplied power used <br />in the plant <br />o Excess heat used by the <br />digester <br />BENEFITS OF CO -GENERATION <br />o On-site electrical generation of 2,000,000 <br />kilowatts is expected to save $230,000 annually; <br />over 50% of the plant's total energy consumption <br />o A reduction of 3 million pounds of COs emissions <br />from the use of fossil fuels and combustion of the <br />flared gas <br />o Reduce landfill of disposed fats, oils, and grease <br />o No cost to ratepayers <br />o New revenue source <br />o WPCP facility improvements <br />o Reduced solids production / hauling costs <br />SELECTION PROCESS <br />o Request for Proposals for Service <br />• Qualified "turn -key" companies <br />• Design -Build -Maintain experience <br />• Financing plan so savings pay for the project <br />• No City funds used in this uroiect <br />o Four highly qualified firms submitted proposallsjt <br />LOCANE e�gr' srEMevs us-- 1111�ilerLrV <br />o Review and interviews by joint E/T — PWS <br />committee <br />2 <br />