OWEA Biosolids Specialty Workshop Renewable Energy ...Presentation Outline Brown and Caldwell 6....
Transcript of OWEA Biosolids Specialty Workshop Renewable Energy ...Presentation Outline Brown and Caldwell 6....
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Renewable Energy Projects: Appropriate Financial Evaluations and Financing Alternatives
OWEA Biosolids Specialty Workshop
December 5| 2013
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The Big Picture
• Majority of WW flow in the US goes to plants with digesters, but significant digester gas is not utilized to recover either heat or power
• 1238 US water resource recovery facilities have digesters
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* EPA CHPP January 2011
Draft Report
http://www.biogasdata.org/
401
837
Without Recovery
With Heat or Energy Recovery
292
545
Digesters with Gas Used to produce Electricity
Digesters with Gas Used for Heat
Cogeneration is key to
approaching net-zero status
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Screw Blowers
Stevens Point, Wisconsin
• 3 mgd
• Process efficiency upgrades• New blowers• New plant air compressor• LED lighting• DO 0.7 mg/L• Optimized thickening to reduce digester
heat• Low energy digester mixing
• Operational awareness
• Codigestion • Brewery waste• FOG
• 180 kW engine – Net Zero
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• 7 mgd
• Codigestion
• Ten 70 kW Microturbines
• Two 200 kW Microturbines
• 90% energy self-sufficient
Sheboygan, Wisconsin
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• 13.8 mgd
• Incremental process improvements• Aeration
• Belt Filter Presses
• Codigestion –• Whey
• Dewatering issues
• Two 350 kW engines
• Net Zero
Gloversville-Johnstown, New York
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• Economic Feasibility Analysis• Capital Costs
• Electrical Savings
• O&M Costs
• Communicating Financial and Sustainability Benefits to Stakeholders
• Financing Alternatives
Presentation Outline
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Financial Feasibility Analysis
Renewable Energy Projects: Appropriate Financial Evaluations and Financing Alternatives
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Gas Pretreatment
Containerized CHP
Capital Cost Considerations
• Cogeneration system size (kW):• Codigestion and biogas growth
projections
• Redundant capacity often not cost effective
• Gas treatment
• Containerized systems minimize costs
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Engine Selection vs. Historic Gas Production Rates
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Equipment Costs: $500-1700/kW
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WERF/Wiser:
Evaluation of
CHP
Technologies,
2010
Prime mover
package
purchase only
Lean Burn
IC Engines
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Recent Project Costs
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All projects
include gas
treatment
ReWa, Bucklin
Pt, and
Midway are
containerized
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• Ohio Industrial Average: $0.0623 per kWh (Sept 2013, US Energy Information Administration)
• National Average $0.0712
• Consumption Charges
• Demand Charges
• Peak/Off-Peak
Electrical Savings: Rates
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Consumption Savings ($/kWh)
• 90% utilization for IC Engines (7884 hrs/yr)
• 95% utilization for combustion turbines
• Gas Availability • Digester load variations
• Future conditions – sludge growth or codigestion
• Natural gas supplementation
• Specific engine electrical efficiencies
Electrical Savings
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37.50%37.10%
36.70%
33.20%
100% Load 80% Load 60% Load 40% Load
Engine Part Load Efficiency Reduces at Partial Engine Loadings
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Demand Savings (monthly $/kW)
• Typically based on 15-minute rolling average peak utility kW
• Oil changes every 1000 hours
• Gas treatment and other maintenance outages• Stand-by generators can mitigate demand impacts
• Schedule maintenance for off-peak hours
• Multiple prime movers also increase demand savings
Electrical Savings Assumptions
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Check utility for hidden fees
• WLSSD Example
• Rate schedules for distributed generation
• Possibly negotiable –Coordinate with electrical utility
Electrical Savings Assumptions
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Table 4-2. Energy Cost Assumptions.
Value Units
Electricity
Consumption1 0.0434 $/kWh
Demand1 6.50 $/kWh
Taxes and Franchise Fees2 7.5 percent
Blended Rate3 0.058 $/kWh
Standby Reservation Fee4 3.08 $/kW
Standby Energy Usage Fee4 0.0157 $/kWh
Natural Gas
Purchase5 6.50 $/MMBtu
Sale (Diesel Equivalent)5 2.00 $/gallon
1. Minnesota Power 2009 Proposed Rates
2. From WLSSD April 2009 Minnesota Power bill
3. Calculated rate. Assumes plant demand levels are unchanged from current
4. Standard Minnesota Power electric service agreement for distributed generation service
5. Engineer’s estimate. Refer to natural gas and diesel sections below.
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• Engine Maintenance ≈$0.015/kWh
• Natural Gas Costs• Heating
• Natural gas blending to maximize output
• Parasitic electrical loads• Gas treatment, boosters
• Gas Pretreatment Media Changes ≈$0.01-0.02/kWh
• Codigestion • Tipping revenue (future ??)
• Management costs
Electrical Savings Partially Offset by O&M
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Natural Gas Costs – Plant Heating
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-
2.00
4.00
6.00
8.00
10.00
12.00
He
at
De
ma
nd
, MM
Btu
/h
r
Total Heat MMBtu/hr
Digester Heat
Building Heat
Biogas Boiler
NG Purchase with
Biogas Boiler,
$110,000/year
Flare
Biogas Boiler
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Natural Gas Costs – Plant Heating
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-
2.00
4.00
6.00
8.00
10.00
12.00
He
at D
em
an
d, M
MB
tu/h
r
Total Heat MMBtu/hr
Digester Heat
Building Heat
Biogas Boiler
CHP Engine Heat
Additional NG
Purchase with Biogas
Engine
+$70,000/year
Engine
Boiler Heat
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• Gas flow uncertainty• Loss of plant industrial loading
• Metering issues
• FOG, Codigestion uncertainty
• Energy Prices• Electrical
• Natural Gas
Risks
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Communicating Financial and Sustainability Benefits to Stakeholders
Renewable Energy Projects: Appropriate Financial Evaluations and Financing Alternatives
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Overview of Economic Analysis Approaches
• Primary approaches include:
• Net Present Value (NPV)
• Internal Rate of Return (IRR)
• Simple Payback
• Limitations to some Approaches
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No one standard approach to determine a suitable Business Case
12/11/2013
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Suggestions for Developing your Evaluations
• Fully Evaluate the “Do Nothing”
• Include planned/needed CIP elements
• Current costs should be known – but consider whether they’re “right” and warrant “adjustment”
• Boiler replacement example
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12/11/2013
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Fictitious Case Study Simplifies Assumptions
Do Nothing Upgrade
Capital Costs: $0 $1,000,000
Base Annual Cost: $500,000 $500,000
Added Annual Cost: $0 $100,000
Total Annual Cost: $500,000 $600,000
Annual Savings: $0 -$175,000
Net Annual Cost: $500,000 $425,000
Life Cycle Term: 20 Years
Net Discount Rate: 2.0%
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Assumptions and Unknowns are rolled into this Simplified Case
• Capital costs are summarized
• Operational costs and savings are summarized
• Assumes no varied escalation or growth
• Uses 20-year life cycle at 2% net discount rate
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Do Nothing Upgrade
Capital Costs: $0 $1,000,000
Base Annual Cost: $500,000 $500,000
Added Annual Cost: $0 $100,000
Total Annual Cost: $500,000 $600,000
Annual Savings: $0 -$175,000
Net Annual Cost: $500,000 $425,000
Life Cycle Term: 20 Years
Net Discount Rate: 2.0%
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Internal Rate of Return (IRR) finds Rate at which PW of Savings equal Costs
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• 4.22% is the rate that, discounted over 20 years, makes the annual savings equal the capital investment
• Criterion: If the IRR > net discount rate, then “go”
4.22% > 2.0%; “GO”
Do Nothing Upgrade
Capital Costs: $0 $1,000,000
Base Annual Cost: $500,000 $500,000
Added Annual Cost: $0 $100,000
Total Annual Cost: $500,000 $600,000
Annual Savings: $0 -$175,000
Net Annual Cost: $500,000 $425,000
Life Cycle Term: 20 Years
Net Discount Rate: 2.0%
Capital Costs: $1,000,000
Net Annual Savings: $75,000
IRR: 4.22%
PW of Annual Cost at IRR: $1,000,000
NPW of Upgrades at IRR: $0
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Reviewing the results…
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MethodologySummary of Results for
Upgrade CaseResult
Simple Payback: 13.3 Years Uncertain
NPW: $226,357 Savings “Go”
IRR: 4.22% > 2.0% “Go”
?
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Sustainability Benefits
• Plant Energy Consumption Reductions
• Greenhouse Gas Reductions
• Example CHP Project• 10 mgd
• 500 kW engine in lieu of boiler
• 1/3 of plant energy production
• Carbon reduction equal to 450 cars
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Example Sustainability Scorecard
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Alternative 1Alternative 1 Alternative 2
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Consider Identification and Inclusion of “Monetized Social or Environmental Value”
• Is there value to the public relations benefit of beneficial reuse of gas?• $$$/year benefit
• $$$ initial capital benefit at start-up
• Does increased truck traffic or noise represent a social cost?• $$$/year cost
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Project Funding
Renewable Energy Projects: Appropriate Financial Evaluations and Financing Alternatives
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Ideally…
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• State
• Federal
• Renewable Energy Credits - Electrical and Bio-CNG
• Utilities
• Equipment Manufacturers
• Design Build Own Operate
Overview of Funding Sources
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• Sales tax exemption (digestion,CHP)
• Energy Loan Fund• Advanced Energy Fund, USDOE State Energy Program
• 1-percent interest rate
• $1 million standard maximum
• Minimum 15% energy reduction
• Up to 90% of project cost
• Advanced Energy Job Stimulus Fund loans• $50,000-$2,000,000
State of Ohio Energy Financing Programs
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• Alternative Energy Portfolio Standard• 25% by 2025 – Waste-to-Energy counts toward goal
• Solar carve-out 0.5% by 2024
• Driver for Renewable Energy Credits (RECs)
• SB 315 Energy Efficiency Resource Standard• Save 22.5% by 2025 – CHP counts toward goal
• Driver for utility rebate programs
Ohio Energy Legislation
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Renewable Energy Credits (RECs)
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Solar Renewable Energy Credits (SRECs)
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Ohio
Solar
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Bio-CNG Incentives
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Time-fill fueling posts from Gas Equipment Systems Inc. (GESI)
$2.60/gallon “sale”
Plus $1.20/gallon for RINs
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• Custom or Renewable Rebates
• Current programs focused on efficiency• CHP Included in 2012 state energy efficiency legislation
• PUCO rules not final
• Must pursue reasonable arrangement with at PUCO with utility
• Example: DPL has reserved $250,000 in pilot program for CHP
Utility Programs
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Jenbacher
Cummins
Manufacturer Financing
• Typical Finance Period: 5-7 Years
• Minimum project size: 300 kW
• “Strong Economic Opportunity”• Electric prices > $0.08-0.09/kWh
• Other incentives could reduce this threshold
• 4 to 8% interest – tax exempt financing
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• DesMoines Biogas CNG Station
• Miami-Dade Digester/Landfill gas cogeneration
• El Paso, TX 3 Plants
Design-Build or DBOO
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• Accurately consider consumption and demand savings
• Implement operating strategies to maximize CHP savings
• Use long-range financial and sustainability metrics to communicate with stakeholders
• Monitor state and utility incentive programs
Conclusions
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