TMWRF LEARNING FROM EXPERIENCE Jason Geddes, Ph.D., Environmental Services Administrator Motivation Deferred maintenance needs No general funds available Energy efficiency to reduce costs Renewable energy commitment U.S. Mayors Climate Agreement Energy Projects
Centralized energy management Outdoor lighting and streetlight upgrades Water system upgrades Pool covers Boiler improvements at Swimming Pools HVAC replacements Reno Arch: 2,076 bulbs to LED City Hall
Lighting systems Chiller/Tower replacement Boiler plant replacement Control systems $6,404,790 Reduce cost from ~$3.67 to ~$1.81 per square foot Older inefficient boiler vs. new energy efficient condensing boilers 1,287 kW PV City-wide at 12 Locations Stead wastewater 522kW Stead Water Treatment Plant Energy Projects
$19,257,112 in projects $1,700,822 per year cost savings (-32%) 8,962,964 kWh/year energy savings (41%) Federal Grants & Utility Rebates QECBs, CREBs, and RZEDs bonds paid back in guaranteed energy savings Federal Grants & Utility Rebates $2,142,800 Energy Efficiency Conservation Block Grants* $156,400 WindGenerations $1,608,660 SolarGenerations $263,592 SureBet $568,700 NSOE Grant $4,740,152 Total Financing $2,261,645 Qualified Energy Conservation Bonds (QECBs)
$2,340,000 Clean & Renewable Energy Bonds (CREBs) $10,860,000 Recovery Zone Economic Development Bonds (RZEDs)* * - EECBG and RZEDs were part of ARRA and not available in future. Replace with municipal or ESCo financing. Savings as of June 30, 2013 Electricity Natural Gas Annual Energy Costs Annual Cost Savings Renewable
Energy Carbon Footprint kWh Therms $ $ kWh Pounds of CO2 FY2007
National Resources Defense Council 22 smartest cities Time.com -10 greenest things you didnt know Fast Company Magazine United States of Innovation SWEEP Innovative Local Government Projects Big Ideas for Job Creation Energy Efficiency in Government Sector Nevada EcoNet Golden Pinecone 10 Cities with Innovative Green Initiatives - NerdWallet www.reno.gov [email protected] TMWRF Motivation CIP backlog of ~$98 million Energy efficiency and chemical savings to reduce costs Desired path to Net-zero energy Nutrient discharge into Truckee River
Emissions reductions Path to Energy Independence Baseline energy use is 159,055 MMBTU per year TMWRF is currently 34% energy independent through digester gas heat production ESCO project will increase energy production by another 13% Potential future on-site electricity generation Install 2nd cogen engine (850 kW) FOG addition and 3rd cogen engine (1 MW) Large scale solar PV system (6 MW) If all future projects are implemented, TMWRF could potentially achieve 96% energy independence Energy Conservation Measures (ECMs) ECM Scope Summary
Cost ECM 2-Centrate Nutrient Recovery Construct a new prefab building Install one Pearl 2000 reactor and its appurtenances Tie-ins to plants utilities $6,760,860 ECM 4A Biogas Cogen Demolish existing cogen system Install a new 850 kW cogen system (Jenbacher 320) $5,116,9671 ECM 4B Digestor Dome Repair digester covers #1 and #3
$3,121,7952 ECM 6 Dewatering upgrades Replace 2 centrifuges (Alpha-Laval G2) Replace 2 cake pumps (Schwing-Bioset) Replace cake piping, valves, actuators Electrical, instrumentation, and controls work $6,066,614 ECM 7 Lighting upgrades Upgrade 1,588 light fixtures $428,761 ECM 9 Near term Dewatering
Repair dewatered sludge hoppers Install new dewatering polymer system Upgrade HVAC and air purge systems Modification to alum and centrate piping $3,005,2022 ECM 10 My Energy Pro MyEnergy Pro utility monitoring system $50,625 Detailed Energy Audit $149,835 Performance and Payment Bonds, Permits $210,930
1 Not in 5 year CIP, but needs to be. 2 Already in 5 year CIP. TOTAL $24,911,589 ECM 4: Biogas Cogeneration Primary Sludge WAS GTO Gravity Thickener Dissolved Air Flotation DAFT Subnatant
$24,911,589 in projects $1,122,887 per year cost savings 5,817,735 kWh/year energy savings 28,985 gallons methanol reduction 1,155 dry tons alum reduced Reduced biosolids hauling and disposal Project Benefits Operational Permit Compliance Benefits: Ostara nutrient recovery
system lowers phosphorous (93%) and nitrogen (7%) for river discharge per TROA and NDEP regulations. Air Quality Permit Compliance: Cogeneration system included in reply to WCAQMD and EPA Region IX. Path to Energy independence: Plant will be nearly 50% net energy and provide renewable energy to NV Energy portfolio standard. Local Jobs and Economic Support: Local equipment distributors, local subcontractors, and local labor are 75%. Leverage Capital Expenditures: Use reserves to fund additional CIP projects beyond the approved 5 year CIP to yield lower operating costs. Lower Operating Costs: Reduce annual operating costs by at least $1.12 million/year.
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