Maximize Minnesota Power Supply And Demand Presentation February 2010
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Transcript of Maximize Minnesota Power Supply And Demand Presentation February 2010
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Power Supply & Demand
Tony RamunnoDirector, Engineering & Project Management
Great River Energy
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Great River Energy
• G&T Cooperative• 28 Member Cooperatives
– Customer Interface• 634,000 Members (Owners)• Sales:
– 57.4% Residential – 40.2% Commercial and Industrial,
Agriculture– 2.4% Seasonal
• 5th largest G&T in nation• Second largest utility in Minnesota
Tony Ramunno - Director Engineering & Project Management - Transmission
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Service area covers 60% of Minnesota
Great River EnergyGreat River Energy
Nearly 850 employees (in MN and ND)
2,800 MW of generation4,500 miles of transmission linesTotal assets: $2.3 billion
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Overview of Presentation
• Generation types/cost/application• Power Delivery – Transmission• Correlation of load to electrical infrastructure• What can we do!
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Introduction
• Electricity Is not Magic – Can’t be stored/warehoused– Ordered, Manufactured, and delivered “on-demand”– Electricity usage and production costs are directly
related!• Infrastructure must be built to accommodate
“peak demand”– Assets are expensive ($$ and lead time)– Users of electricity share the cost
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Power GenerationPlant Type Cost to Build Cost per MW Response Flexibility
Peaking (Gas, Oil) $ $$$$ Excellent
Intermediate (Gas) $$$ $$$ Good
Baseload (Nuke, Hydro, Coal)
$$$$ $ Poor
Wind $$ $$$ None (availability of wind)
The Lowest Cost Plant is the one not built!
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Matching Generation & Load Types
Baseload GenerationRun Continuous
IntermediateRun as Planned/Needed
Peaking Run When Necessary
Low Cost Generation
High Cost Generation
Continuous Load
Cycling, Seasonal, other predictable Load
Unpredictable or added to high Load timeframe
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Power Delivery System OverviewTransmission Must Cover “peak load”
PurchasedPower
GeneratingPlants
BulkTransmission
BulkTransmissionSubstation
Load ServingTransmission
DistributionSubstations
Distribution Lines
Power is generated or purchased
Bulk transmission (DC line and >115kv) moves the power to transmission substations, allows reserve sharing, and integrates resources into a regional grid
distribution substations drop the voltage down
Load serving transmission (<115kv) moves the power to distribution substations
These substations drop the voltage down
distribution lines move the power to the end customer.
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Typical Utility Demand Curve
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Ideal Load Curve!
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What Can We Do!1. Understand/manage process energy usage
• Energize/de-energize frequency/duration• Staging starts/stops to levelize load
2. Consider energy in utilization equation• Is there operational flexibility?• Can facility load be shifted to off-peak times?
3. Consider energy in equipment selection• Energy efficiency – upfront vs. lifetime costs
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Working Together
• Collaborate with Electric Utility– Time of day or time of year load benefits– On-site emergency generation capabilities– Load shedding or other flexibility during times of
emergency• We all share the costs for Electrical Infrastructure! • We all share the savings of deferred/delayed
infrastructure!
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Questions