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HomeMy WebLinkAboutWildephor_Truckee Bioenergy Project Scoping Study_TDPUD Board Meeting_2022-08-03_FINALTruckee Bioenergy Project Scoping Study Update and Recommendations Prepared by: Wildephor Consulting Services, LLC � TRUCKEE DONNER PUBLIC U'fiLlfiY DlSiRICT Truckee Donner Public Utility District Board Meeting 3 August 2022 Topics • Green Waste Disposal • Candidate Solutions • Study Refinement Effort • Potentially Viable Options • Recommendations 8/3/2022 Truckee Bioenergy Project Scoping Study Green Waste Disposal • Initial evaluation of biomass utilization options as an alternative to landfill disposal • Town disposing of 25k cubic yards annually; 5,000 green tons / 4,000 bone dry tons (BDT) • TTSD tipping fee more than doubled since 2018 • Green waste projected to increase by 3x due to Measure T programs: >$1 MM/year disposal 8/3/2022 Truckee Bioenergy Project Scoping Study Candidate Solutions • Evaluated community -scale solutions based on technology agnostic end products • Three major solution types considered A. Disposal B. Biomass Power c. Biomass Heat • Total of seven candidate solutions evaluated as alternatives to baseline disposal 8/3/2022 Truckee Bioenergy Project Scoping Study Study Refinement Effort 1. Assess long-term disposal costs at ERL • TTSD believes tipping fee now stable ($15/CY) • Have enhanced green waste handling processes • Cogen plants not viewed as long-term buyers 2. Confirm quality/quantity of TFPD biomass • Defensible space programs = 1,600 BDT/year • Treatment of 500 acres/year = 6,400 BDT/year • Roughly 50% projected to be high quality chips 8/3/2022 Truckee Bioenergy Project Scoping Study I 4. Study Refinement Effort Investigate air curtain burner permitting • Requires air, water, and chip storage permits • Permitting not feasible for 2022 operations • TTSD came to same conclusion for unit at ERL Evaluate PPAMEM options with TDPUD • 1 MWe biomass power plant would require PPA • 150 kWe generator could use net metering • TDPUD to hire consultant for detailed analysis 8/3/2022 Truckee Bioenergy Project Scoping Study Study Refinement Effort s. Inquire into biochar for SB 1383 targets • Corresponded with program staff at CalRecycle • Use of biochar does not count toward targets • Recycled organics must come from permitted MRF 6. Consider hydronic snow melt for TTAD • Substantial excess process heat may be available • Could provide snow melt for main airport apron • TTAD management is interested in exploring idea 8/3/2022 Truckee Bioenergy Project Scoping Study Potentially Viable Options • Option A: Biomass Power • 1.0 MWe gasifier w/engine or turbine generator • Would consume—6,000 BDT/year of feedstock • Could supply microgrid during main grid outages • Option B: Combined Heat and Biochar • 3.5 MWth pyrolysis plant w/electric generator • Would consume---9,000 BDT/Year of feedstock • Modular system could be expanded overtime 8/3/2022 Truckee Bioenergy Project Scoping Study Potentially Viable Options A Biomass Power: SynCraft Gasification System 8/3/2022 Truckee Bioenergy Project Scoping Study Potentially Viable Options Bulk char outload Thermal oxidiser Feed metering bin 3.5 MW steam boiler (optional) Spray absorption type wet scrubber PER `�4� Induced draft fan CCT 18 Dual Rotary hearth \ Control room Combined Heat and Biochar: Pyrocal CCT System 8/3/2022 Truckee Bioenergy Project Scoping Study Recommendations • Detailed feasibility assessment of both options needed to support capital project decision • Biochar market study needed to provide basis for estimating financial contribution • Nine -month duration; timeline for facility design and construction additional 18-24 months 8/3/2022 Truckee Bioenergy Project Scoping Study W vp I fl