fpsc electric utility infrastructure workshop florida municipal electric utilities alan shaffer...
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FPSC Electric Utility Infrastructure Workshop
Florida Municipal Electric Utilities
Alan ShafferAssistant General Manager - DeliveryLakeland Electric
January 23, 2006
Florida Public Power Utilities 33 Municipal Electric Utilities 1.3 Million customer meters (15% of
Floridians) Distribution
11,000 miles above ground 7,600 miles underground
Transmission 1,700 miles above ground 70 miles underground
300 substations Every storm impacted at least one
municipal electric utility
3
Florida’s Public Power Utilities
Winter Park
Winter Park
Reedy Creek
Nature of Storm Damage
Transmission System Most transmission systems had little to
no damage Kissimmee had 74 poles down after Charlie Keys Energy had sailboat masts into some
transmission
Nature of Storm Damage Distribution System
Vero Beach lost 100% of customers from Jeanne, Lakeland lost 80%
Minor to significant pole and wire failures Most caused from nearby tree/limb failures Lightning burning down wire Some pole failure attributed to successive storms
and water-softened earth Vehicles striking poles
Underground Some flooding in coastal and low areas Some uprooting from tree failures
Nature of Storm Damage
Substations Most experienced no substation damage
Keys Energy Transformer LTC flooding and 138kv breaker bushing flashover from salt contamination
JEA had 3 substation transformers fail within 1 week attributed to effects of repeated reclosing into distribution faults
Vero Beach had significant substation switchgear damage from water intrusion
Mutual Aid FMEA and APPA Mutual Aid Agreements
Utilized Executed by all FMEA-member utilities Coordinated through FMEA Executive Director
and Mutual Aid Coordinator Worked closely with electric cooperatives and
investor-owned utilities Supplied FPL with Florida and out-of-state crews
Received aid from not only Florida utilities but municipals as far as Texas, Kansas, Ohio, Wisconsin, and New England
Repair Standards All municipals utilizing external crews
assigned their own personnel to oversee work and maintain standards within reason (line and tree crews)
Performed post-restoration inspections to check reconstruction and make additional corrections
All utilities supplied most all their own standard material for their repairs
Vegetation Management Routine Distribution Maintenance
Most municipals have a 3-year trim cycle Keys Energy is limited to a 6-month growth trim
by local ordinance Tallahassee is on an 18-month cycle Some like Gainesville and Lakeland include
service drops Herbicides and growth retardant used Trimmed to four to six foot clearance Danger trees removed where possible Outage data used by some to target locations Joint tree trimming w/ telcos would be beneficial
Vegetation Management
Routine Transmission Maintenance Most municipals maintain an annual
inspection/trim cycle Jacksonville Beach and Gainesville
inspect semiannually Trimmed to 10 to 15 foot clearance
Vegetation Management
Post-Storm Inspection Most utilities inspect as part of the
system restoration inspection of outage areas
Some dependence on severity of storm event
Keys Energy and Jacksonville Beach inspect all transmission and main circuits
Pole Inspections
All municipals conduct pole inspections Most are 5 to 8-year cycle Include conductors and connections Tallahassee conducts pole-by-pole
inspections of circuits with highest number of interruptions
Undergrounding Have discussed undergrounding with community for
years Citizens appreciate learning the pros & cons
Undergrounding does not solve all “hurricane” outage problems
Many citizens reluctant to pay for cost of conversion, even with cost-sharing
Some utilities considering converting overhead lines to underground Winter Park beginning a selective conversion to
underground Vero Beach converting aging lines when justified Jacksonville Beach converting all overhead within 3
blocks from ocean
Design Changes Additional movement to spun concrete or steel poles and
higher wind load ratings Transmission and main line distribution Kissimmee - distribution with 3-phase banks or 3-phase risers
Over-insulating substation tie-lines to reduce salt intrusion outages near coast
Winter Park installing 3-phase gang-operated switches to speed sectionalizing, initiating an undergrounding program
Some relocating rear-lot easements to street right-of-ways Key West
Wind-load design of 165+ mph Using more concrete poles 8-hour battery backup for traffic lights Using more stainless steel hardware at some locations
Other Changes Several have shortened their pole and line clearance
inspection cycles and added more line clearance crews Several have become more aggressive with
removing/topping danger trees Customers more willing to agree with clearance activities
Majority experienced few repair material shortages but some storm stock inventory levels adjusted based on experiences. Vendor alliances
Several reported Emergency Operations Plan changes from lessons learned including: Revised personnel assignments Training substation or meter personnel to assist T&D Use retired personnel Making an earlier determination of mutual aid and
contract crew needs and securing logistical needs