Dispersed Renewable Generation Transmission Study by Mike Michaud Matrix Energy Solutions June 27, 2008

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1 Dispersed Renewable Generation Transmission Study by Mike Michaud Matrix Energy Solutions June 27, 2008

2 STUDY SCOPE Analyze transmission impacts of 1200 MW of new dispersed renewable generation located statewide Two phases Study Phase I: 600 MW Report by OES due June 2008 Study Phase II: 600 MW Report by OES due September 2009

3 Transmission Modeling MTEP07, 2013 Summer Peak and Off-Peak models Removed Line/Facilities which will not be in-service before or during Integrated GRE-LRP transmission model detail Gather additional detail from Minnesota utilities Added Lower Voltage Lines (34.5 kv, 41.6 kv, 46 kv) Re-allocated loads from higher voltage to lower voltage buses Prior queued generation was not included in the study model.

4 Substation Information Wind Profile Information Used GIS data & DOC Wind Maps to get capacity factor at substations Distribution Transformer Information Gathered Maximum Load, Minimum Load & Transformer MVA Rating Gathered Data on 2253 Substations at 34.5 kv or Higher Voltages

5 Screening Methodology/Criteria Utilized DC Analysis of incremental transfer capability to select DRG Short List sites Selected lower-voltage generation study sites Screened promising sites further by wind profile (Minimum of 35 % Capacity Factor) Divided sites equally among planning zones Added Biomass site to Short List

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7 First Substation Short List Map

8 AC Analysis Single Site

9 Dorsey Transformer Issues

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11 RESULTS The analysis successfully demonstrated a DRG scenario where 600 MW could be sited without significantly affecting any transmission infrastructure.

12 RESULTS The analysis demonstrated that fixing the Dorsey transformer problem will likely unlock significant opportunity for more dispersed generation in the Northern half of the state.

13 RESULTS DORSEY OPTIONS IDENTIFIED Install a third 1200 MVA, 230/500 kv transformer at Dorsey ($41 M) Install phase shifters on three northern 230 kv lines ($60M) Install a Special Protection Scheme to curtail Minnesota generation Communicate and coordinate a DC Runback resolution with Manitoba Hydro

14 RESULTS The utilities have now created a statewide computer model of the lower voltage transmission system that can be the basis for further study work.

15 RESULTS OES plans to convene and facilitate a technical working group in the second half of 2008 to look into actions necessary, in coordination with the Midwest ISO and with the Minnesota utilities, to interconnect potential DRG projects with a focus on lower voltage interconnections.

16 RESULTS We now have available an analysis of likely injection potential for generation installed at virtually every substation in the state with an indication of likely wind turbine capacity factors.

17 RESULTS The analysis found 393 substations throughout the state that passed all the screening tests. Only 20 of these were used to create the result that 600 MW of Generation outlet could be developed with no necessary transmission enhancements.

18 RESULTS A team of utility engineers and national experts is convened to continue the work of examining the potential for dispersed generation and will report out how to get another increment of 600 MW this way.

19 TO BE CONTINUED