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Substation Asset Strategy Kevin Dasso, Senior Director Engineering and Operations

Substation Asset Strategy Kevin Dasso, Senior Director Engineering and Operations IEEE/PES Annual Substations Committee Meeting April 7, 2008. Outline. About PG&E Challenges Project Activities Capital Investment Outlook Trends Bus Conversions Mission Substation Rebuild Questions. !.

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Substation Asset Strategy Kevin Dasso, Senior Director Engineering and Operations

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  1. Substation Asset Strategy Kevin Dasso, Senior Director Engineering and Operations IEEE/PES Annual Substations Committee Meeting April 7, 2008

  2. Outline • About PG&E • Challenges • Project Activities • Capital Investment Outlook • Trends • Bus Conversions • Mission Substation Rebuild • Questions

  3. ! About PG&E • PG&E serves 13 million people, or 1 out of every 20 people in the U.S. • 70,000 Square Miles Service Territory, from Eureka in the north to Bakersfield to the south • 5 Million Electric Customers • 4 Million Gas Customers • Transmission Voltages – 500, 230, 115, 70 & 60 kV • Distribution Voltages – 35, 21, 17, 12 & 4 kV • Substations - 748 PG&E Service Territory Map

  4. Electric Transmission Investment Profile • Fastest-growing area of the business • Investment driven by: • System expansions as approved by the California ISO • Interconnections/upgrades to support new generation • Replacements, upgrades, and other life extension programs to maintain capacity • Reduction of grid congestion and Reliability Must Run contracts • Access to renewable generating resources

  5. Challenges • Aging Infrastructure • Replacements, upgrades, and other life extension programs to maintain line capacity • “Experienced” workforce • NERC standards compliance

  6. Capital Expenditure Outlook Projected capital expenditures average $900M for years 2008-2012: ($MM)

  7. Trends • Capacity growth • Reliability enhancements • Aggregation of future planned work at each facility in order to effect wholesale reliability upgrades

  8. Bus Conversions -- Distribution • The majority of existing distribution busses are single-bus • New installations are designed with a ring bus ► • Major equipment replacement or capacity expansion projects present opportunities to convert to ring bus

  9. Bus Conversions -- Transmission • The majority of transmission busses are double-bus / single breaker • New installations are designed with breaker-and-a-half (BAAH) bus ► • Major equipment replacement or capacity expansion projects present opportunities to convert to BAAH bus • Space constraints drive toward GIS technology

  10. Mission Substation Rebuild • Many aspects were considered: • Operating Philosophy • Planned area upgrades • Reliability indexes and Outage statistics • Load balancing on 115 kV sources • Load planning and fault current levels • Available floor space, and construction sequencing • Construction clearance considerations—load shifting and switching ability

  11. Mission Substation Rebuild • Existing Substation Configuration: • Built in 1947; expanded in 1958 • Indoor substation with 3 floors • Four incoming 115 kV underground cables • 115 kV open-air ring bus and equipment, with wall bushings between rooms • 12 kV is double-bus switchgear; multi-floor • 15 radial feeders, 9 network feeders, 14 tie cables • Three 50MVA and two 35MVA transformers, forced-oil, in separated rooms

  12. Mission Substation Rebuild External Building View

  13. Mission Substation Rebuild Bank Line Bank Line Line Existing Single Line Diagram – 9 element Ring Bus Bank Line Bank Bank

  14. Mission Substation Rebuild Existing Control Room

  15. Mission Substation Rebuild • New Substation Configuration: • Rebuild in place, rather than across the street • Replace all existing 12 kV switchgear with new, compact switchgear (frees up needed floor space) • Increase capacity -- replace the 5 existing transformers with new 75MVA standard size and add a 6th transformer -- doubles capacity to 450 MVA! • Reduce fault current levels -- only 2 banks in parallel • Replace 115 kV open air bus with GIS • Replace all relays and control with latest integrated schemes

  16. Line Line FUT Bank Bank Bank Bank Bank Bank FUT Line Line Mission Substation Rebuild New Single Line Diagram – 6 bay BAAH (2 spare elements)

  17. Mission Substation Rebuild New Control Room (simulated)

  18. Mission Substation Rebuild • Conversion Timeline: • 2007-2009 Switchgear replacement, in two phases • 2008 Award GIS and EPC project contract • 2010 Rebuild complete

  19. Q & A

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