Electric Utility Infrastructure Commission Staff Workshop January 23, 2006

2 Overview l What did PEF see in the 2004 and 2005 hurricane seasons l What did the 2004 and 2005 hurricane seasons reveal about PEF’s system and what have we done in response l What outage mitigation options may warrant additional study

3 PEF System Impact Orlando Tallahassee St Petersburg Charley 145MPH Frances 100MPH Jeanne 110MPH

4 Storm Comparison Outage Experience Peak Customers OutTransmission Miles OutSubstations Out

5 Storm Comparison Damage Experience Transmission Structures Damaged Distribution Transformers Replaced Distribution Poles Replaced

6 Storm Comparison Restoration Experience Peak Non-Native Resources Restoration Days Cost $ Million

7 Damage Assessment l Transmission w Higher voltage performed better than lower w Concrete & steel performed better than wood l Substations w No significant damage within footprint w Outages primarily due to trees on connecting lines l Distribution w Tree-related damage prevalent w Codes / standards not a significant issue

8 Damage Assessment Transmission / Charley

9 Damage Assessment Transmission / Frances

10 Damage Assessment Transmission / Jeanne

11 Damage Assessment Distribution / Charley OH Outage Severity UG Outage Severity Customers Interrupted >80% 40-80% <40% Customers Interrupted >80% 40-80% <40%

12 Damage Assessment Distribution / Frances Customers Interrupted >80% 40-80% <40% Customers Interrupted >80% 40-80% <40% OH Outage Severity UG Outage Severity

13 Damage Assessment Distribution / Jeanne Customers Interrupted >80% 40-80% <40% Customers Interrupted >80% 40-80% <40% OH Outage Severity UG Outage Severity

14 Potential Mitigation Approach

15 Potential Outage Mitigation Options l Evaluate migration away from wood transmission poles l Further review and, if feasible, facilitate targeted underground conversion l Evaluate ways to facilitate vegetation management

16 Potential Outage Mitigation Options l Evaluate migration away from wood transmission poles l Further review and, if feasible, facilitate targeted underground conversion l Evaluate ways to facilitate vegetation management

17 Potential Outage Mitigation Options l Evaluate migration away from wood transmission poles l Further review and, if feasible, facilitate targeted underground conversion l Evaluate ways to facilitate vegetation management

18 Potential Outage Mitigation Options

19 Potential Outage Mitigation Options l Evaluate migration away from wood transmission poles l Further review and, if feasible, facilitate targeted underground conversion l Evaluate ways to facilitate vegetation management

20 Tree Interference

21 Tree Interference

22 Tree Interference

23 Tree Interference

24 Concluding Thoughts l It makes sense to review our assumptions in light of 2004 and 2005 hurricanes l Take time to be sure changes truly are for the better l Recognize that there is no silver bullet and that all solutions come with a cost l PEF will continue to be active in evaluating alternatives that work for Florida