maximize minnesota power supply and demand presentation february 2010
DESCRIPTION
Power Supply & Demand, presentation given by Tony Ramunno, Director, Engineering & Project Management for Great River Energy. Presented at the February 18, 2010 Maximize Minnesota event held at South Central College, North Mankato, MNTRANSCRIPT
Power Supply & Demand
Tony RamunnoDirector, Engineering & Project Management
Great River Energy
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
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
Overview of Presentation
• Generation types/cost/application• Power Delivery – Transmission• Correlation of load to electrical infrastructure• What can we do!
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 ($$ and lead time)– Users of electricity share the cost
Power GenerationPlant Type Cost to Build Cost per MW Response Flexibility
Peaking (Gas, Oil) $ $$$$ Excellent
Intermediate (Gas) $$$ $$$ Good
Baseload (Nuke, Hydro, Coal)
$$$$ $ Poor
Wind $$ $$$ None (availability of wind)
The Lowest Cost Plant is the one not built!
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
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.
Typical Utility Demand Curve
Ideal Load Curve!
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
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!
Questions