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, MN
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Maximize Minnesota Power Supply And Demand Presentation February 2010
1. Power Supply & Demand Tony Ramunno Director, Engineering & Project Management Great River Energy
2. 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
3. Great River Energy Service area covers 60% of Minnesota Nearly 850 employees (in MN and ND) 2,800 MW of generation 4,500 miles of transmission lines Total assets: $2.3 billion
4. Overview of Presentation Generation types/cost/application Power Delivery – Transmission Correlation of load to electrical infrastructure What can we do!
5. 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
7. Matching Generation & Load Types Unpredictable or added to high Load timeframe High Cost Generation Cycling, Seasonal, other predictable Load ContinuousLoad Low Cost Generation
8. Power Delivery System OverviewTransmission Must Cover “peak load” Generating Plants Purchased Power 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 Bulk Transmission Bulk Transmission Substation These substations drop the voltage down Load serving transmission (<115kv) moves the power to distribution substations Load Serving Transmission distribution substations drop the voltage down Distribution Substations Distribution Lines distribution lines move the power to the end customer.
11. What Can We Do! Understand/manage process energy usage Energize/de-energize frequency/duration Staging starts/stops to levelize load Consider energy in utilization equation Is there operational flexibility? Can facility load be shifted to off-peak times? Consider energy in equipment selection Energy efficiency – upfront vs. lifetime costs
12. 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!
This chart is busy, intention is to show Optimization of Generation relative to the load characteristics Run Baseload plants continuous Least cost generation Utilize intermediate plants for seasonal (or other planned) load fluctuationUtilize peaking to cover peak loads (hot days) high loads for short duration
Need enough continuous load during off-peak times to keep base load plants on-line! Wind Generation makes this more challenging (calm hot days and windy nights!)Minimize unpredictable or peak loads (more costly to Generate Power)
The red line represents a load curve that would be ideal considering the demand curves for this utilityThis is what is exciting about pluggable electric automobiles…plug in at night more fully leveraging existing infrastructure
