Transmission Outages. October 23, 2008

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Sherilyn Cameron
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1 Transmission Outages Outage The McCall Rd. 500/230kV autotransformer will be opened for a couple of hours on Thursday October 23. This outage will isolate Effingham County generation from the transmission system. McCall Road TS Replacement of temperature devices on equipment The Hatch-Duval 500 kv line tripped out shortly before 11:00. The Florida outbound TTC is being reduced as a result of this outage. No estimate yet on time for a return to service. Please check the OASIS postings for updates. Homeland Macedonia 115 kv line. Work will be done at Saint George to remove breaker and isolation and replace switches. Work is scheduled to start at 07:00 Hrs 12/08/08 and end at 17:00 Hrs 12/19/08. Villa Rica - Wansley 500kV is expected to be out of service till 15:00 12/17/08 The Hatch-Duval 500 kv line has been taken out of service, Jan 13, 2009 at 13:24. No estimate yet on time for a return to service. Please check the SOCO OASIS postings for updates. Duration October 23, /10/ /12/ /10/08 12:00 noon TBA 12/08/ :00 Hr To 12/19/ :00 Hr 12/17/2008 until 15:00 Until further notice (check back for updates) ITS and Florida Official Transmission Outage For the Hatch - N. Tifton 500 kv line outage scheduled from 03/04/09 at 06:00 CPT until 03/20/09 at 17:00 CPT, the SOCO-Florida Interface will be reduced to 3200 MW. The Total Transfer Capability will be monitored and adjusted on a 2-day out basis and may be adjusted in real-time as conditions warrant. 6:00 CPT until 17:00 CPT

2 Outage notification: Bio Center 230kV Line is currently out due to damage and is scheduled to be out until 03/04/2009. Bio Hartwell Energy 230kV Operational Maintenance Testing from 03/15/09 6:00 to 16:30 500kV Bradley (TVA) Conasauga 500 kv Line outage scheduled to replace insulators 03/14/ :00 to 03/15/ :00 GTC has scheduled an outage on the Bio Center 230kV line on Sunday April 5. Outage notification: Bay Creek LG&E Monroe 230kV line. Unscheduled outage: Raccoon Creek Mitchell 230kV line Voltage drops occurred across phases 1 & 3. Emergency outage of the Hatch - Duval 500 kv line starting on 06/25/09 at 23:00 and ending on 06/26/09 at 05:00, the SOCO- Florida Interface will be reduced to 1200 MW. ITS Official Transmission Outage Outage of the East Point (TVA) - Miller (SoCo) 500kV line starting 07/07/09 at 08:00 until 07/10/09 at 16:00, the TVA-Southern Interface import limit will be reduced to 1700 MW. Outage of the East Point (TVA) - Miller (SoCo) 500kV line starting 07/14/09 through 07/17/09 from 09:00 to 18:00 each day, the TVA-Southern Interface import limit will be reduced to 1700 MW. Please note that this line will be returned to service at 18:00 each evening. For the emergency outage of the Hatch - Thalmann 500 kv line on 07/16/09 from 00:00 to 04:00, the SOCO-Florida Interface will be reduced to 2400 MW. Until 03/04/ /15/09 6:00 to 16:30 03/14/ :00 to 03/15/ :00 04/05/09 07:00 17:00 05/14/ /15/ /15/ :00 15:30 6/25/ :00 to 6/26/ :00 07/07/09 at 08:00 to 07/10/09 at 16:00 07/14/09 at 09:00 to 07/14/09 at 18:00 07/16/09 at 00:00 to 04:00

3 ITS Official Transmission Outage For the outage of the McIntosh (SoCo)- Purrysburg (SCPSA) 230kV TL starting at 9/30/09 7:00 until 9/30/09 9:00 the SOCO-SCPSA interface will be reduced to 128 MW. ITS Official Transmission Outage The Sequoyah - Bradley 500kV TL will be out of service from 10/05/09 at 04:00 until 10/09/09 at 16:00. This work may also necessitate opening the Bradley - Conasauga 500kV TL. The Loopers Farm - Oostanaula 230kV TL will be out of service from 10/05/09 at 07:00 until 10/06/09 at 17:00. For the concurrent outages of the Sequoyah - Bradley 500kV TL, the Bradley - Conasauga 500kV TL and the Loopers Farm - Oostanaula 230kV TL starting 10/05/09 at 04:00 until 10/06/09 at 17:00, the TVA-Southern interface limit will be reduced to 670MW. For the concurrent outages of the Sequoyah - Bradley 500kV TL and the Bradley - Conasauga 500kV TL starting 10/06/09 at 17:01 until 10/09/09 at 16:00, the TVA-Southern interface limit will be reduced to 780MW. If TVA determines that the Bradley - Conasauga 500kV can be safely left in service during the outage of the Bradley - Sequoyah 500kV TL, then for the concurrent outages of the Sequoyah - Bradley 500kV TL and the Loopers Farm - Oostanaula 230kV TL starting 10/05/09 at 04:00 until 10/06/09 at 17:00, the TVA-Southern interface limit will be reduced to 1550MW. 9/30/09 at 7:00 to 9:00 The Sequoyah - Bradley 500kV TL 10/05/09 at 04:00 until 10/09/09 at 16:00. Bradley - Conasauga 500kV TL and the Loopers Farm - Oostanaula 230kV TL 10/05/09 at 04:00 until 10/06/09 at 17:00 Sequoyah - Bradley 500kV TL and the Bradley - Conasauga 500kV TL starting 10/06/09 at 17:01 until 10/09/09 at 16:00 If TVA determines that the Bradley - Conasauga 500kV can be safely left in service during the outage of the Bradley - Sequoyah 500kV TL, then for the outage of the Sequoyah - Bradley 500kV TL starting 10/06/09 at 17:01 until 10/09/09 at 16:00, the TVA-Southern interface limit will be reduced to 1560MW. The Total Transfer Capability will be monitored and adjusted on a 2-day out basis and may be adjusted in real-time as system conditions warrant.

4 This interface notification replaces the prior notice. The outage of the Thalman - Duval 500kV TL previously scheduled for the evening of 10/07/09 has been delayed. In the same timeframe an outage will be taken of the the SOCO-Florida Interface will be reduced to 2000 MW. For the outage of the Thalmann - Duval 500kV TL starting at 10/13/09 22:00 until 10/14/09 06:00 the SOCO-Florida Interface will be reduced to 1300 MW. For the outage of the Hatch - Thalmann 500kV TL starting at 10/17/09 5:00 until 10/19/09 21:00 the SOCO-Florida Interface will be reduced to 2800 MW. ITS Official Transmission Outage For the outage of the Miller - South Bessemer 500kV TL starting at 10/19/09 7:00 until 10/29/09 17:00 the SOCO-TVA Interface will be reduced to 766 MW. For the outage of the Hatch - Thalmann 500kV TL starting at 10/24/09 5:00 until 10/26/09 21:00 the SOCO-Florida Interface will be reduced to 2900 MW. Pine Grove- Suwannee 230kV TL. starting at 10/7/09 19:00 until 10/8/09 09:00 Thalmann - Duval 500kV TL 10/13/09 22:00 until 10/14/09 06:00 Hatch - Thalmann 500kV TL 10/17/09 5:00 until 10/19/09 21:00 Miller - South Bessemer 500kV TL 10/19/09 7:00 until 10/29/09 17:00 Hatch - Thalmann 500kV TL 10/24/09 5:00 until 10/26/09 21:00

5 For the outage of the South Bainbridge - Sub 20 (TAL) 230kV TL starting at 12/10/09 06:00 until 12/11/09 16:00 the SOCO-Florida Interface will be reduced to 3300 MW. South Bainbridge - Sub 20 (TAL) 230kV TL 12/10/09 06:00 until 12/11/09 16:00 The Florida interface will re-evaluated on a 2-day out basis and may be adjusted in realtime as conditions warrant. For the outage of the South Bainbridge - Sub 20 (TAL) 230kV TL starting at 01/04/10 06:00 until 01/07/10 16:00 the SOCO-Florida Interface will be reduced to 3400 MW. The Florida interface will re-evaluated on a 2-day out basis and may be adjusted in real-time as conditions warrant. LUDOWICI PRIMARY 115kV Breaker Outage on 2/17/2010 A maintenance inspection has been scheduled on the Jesup 115kV line breaker at Ludowici substation on 08:00 to 02/17/ :00. ITS Official Transmission Outage For the outage of the Vogtle - Warthen 500kV TL starting at 02/17/10 08:00 until 02/18/10 16:30 the SOCO-VACAR Interface will be reduced to 1990 MW. For the outage of the North Tifton 230kV Bus #2 starting early morning at 02/23/10 01:00 until 02/23/10 04:00 the SOCO-Florida Interface will be reduced to 3200 MW. South Bainbridge - Sub 20 (TAL) 230kV TL 01/04/10 06:00 until 01/07/10 16:00 Jesup 115kv breaker at Ludowici 02/17/10 8:00 to 02/17/10 17:00 Vogtle - Warthen 500kV TL starting at 02/17/10 08:00 until 02/18/10 16:30 North Tifton 230kV Bus #2 02/23/10 01:00 until 02/23/10 04:00

6 Outage of the Duval (FP&L) - Hatch 500kV TL starting at 03/10/10 08:00 until 03/12/10 17:00. The SOCO-Florida Interface will be reduced to 1600 MW. This represents an additional 100MW reduction over previous anticipated reduction Update 8:05 a.m. No reduction on the SOCO-Florida Interface is anticpated. For the outage of the Pine Grove 115kV Bus #2 starting at 04/5/10 06:00 until 04/9/10 17:00 the SOCO-Florida Interface will be reduced to 2200 MW. Duval (FP&L) - Hatch 500kV TL starting at 03/10/10 08:00 until 03/12/10 17:00. Pine Grove 115kV Bus #2 starting at 04/5/10 06:00 until 04/9/10 17:00 The Florida interface will be re-evaluated on a 2-day out basis and may be adjusted in real-time as conditions warrant. For the outage of the Colerain - Kingsland 230kV TL starting at 04/12/10 07:00 until 04/13/10 07:00 the SOCO-Florida Interface will be reduced to 3300 MW. For the simultaneous outages of the East Moultrie 230kV bus, the East Moultrie 230/115kV transformer and the Colerain - Kingsland 230kV TL starting at 04/13/10 07:00 until 04/13/10 15:00 the SOCO-Florida Interface will be reduced to 3100 MW. For the outage of the Colerain - Kingsland 230kV TL starting at 04/13/10 15:00 until 04/14/10 16:00 the SOCO-Florida Interface will be reduced to 3300 MW. For the outage of the Hatch - Duval 500kV TL starting at 04/13/10 21:00 until 04/14/10 09:00 the SOCO-Florida Interface will be reduced to 1400 MW. Colerain - Kingsland 230kV TL at 04/12/10 07:00 until 04/13/10 07:00 East Moultrie 230kV bus, the East Moultrie 230/115kV transformer and the Colerain - Kingsland 230kV TL starting at 04/13/10 07:00 until 04/13/10 15:00 Colerain - Kingsland 230kV TL starting at 04/13/10 15:00 until 04/14/10 16:00 Hatch - Duval 500kV TL starting at 04/13/10 21:00 until 04/14/10 09:00

7 This notice replaces the prior notification regarding interface reduction associated with the Colerain - Kingsland 230kV TL outage which has been delayed to accommodate this work. For the outage of the Pine Grove Primary 230/115kV Bank and 115kV Bus #2 starting at 04/17/10 06:00 until 04/18/10 17:00 the SOCO-Florida Interface will be reduced to 2800 MW. For the outage of the Kingsland-Yulee 230kV TL starting at 04/26/10 06:00 until 05/14/10 16:30 the SOCO-Florida Interface will be reduced to 3200 MW. ITS Official Transmission Outage For the outage of the Miller Steam Plant (SoCo) - East Point(TVA) 500kV line starting 05/08/10 at 06:00 until 5/9/10 18:00, the TVA-Southern Interface import limit will be reduced to 900 MW. For the outage of the Duval (FP&L) - Hatch 500kV TL starting at 06/03/10 21:00 until 06/04/10 08:00 the SOCO-Florida Interface will be reduced to 1500 MW. Please take note that this outage occurs overnight during off-peak hours. Pine Grove Primary 230/115kV Bank and 115kV Bus #2 starting at 04/17/10 06:00 until 04/18/10 17:00 Kingsland-Yulee 230kV TL starting at 04/26/10 06:00 until 05/14/10 16:30 East Point(TVA) 500kV line starting 05/08/10 at 06:00 until 5/9/10 18:00 Duval (FP&L) - Hatch 500kV TL starting at 06/03/10 21:00 until 06/04/10 08:00 Bio - Center 230kV Line The Bio - Center 230kV line has been de-rated until further notice. The de-rating may impact available transfer capability on the Duke interface. Please check ATC/TTC postings for any potential impacts. For the Saturday outage of the Thomasville - West Valdosta 230kV TL starting at 06/12/10 06:00 until 06/12/10 17:00 the SOCO-Florida Interface will be Thomasville - West Valdosta 230kV TL starting at 06/12/10 06:00 until 06/12/10 17:00

8 reduced to 3300 MW. For the Sunday outage of the Thomasville - West Valdosta 230kV TL starting at 06/13/10 06:00 until 06/13/10 17:00 the SOCO-Florida Interface will be again reduced to 3300 MW. For the outage of the Pine Grove Primary - Twin Lakes 115kV TL starting at 06/17/10 22:00 until 06/18/10 05:00 the SOCO-Florida Interface will be reduced to 2800 MW. Please take note that this outage occurs overnight during off-peak hours. ITS Maintenance Work Yates to Yellowdirt 230kV line - Maintenance work to replace/install fiber optic cable will affect the Yates to Yellowdirt 230kV line from 6:00 to 17:00. ITS Maintenance Work Rescheduled Yates to Yellowdirt 230kV line - Maintenance work to replace/install fiber optic cable will affect the Yates to Yellowdirt 230kV line from 6:00 to 17:00. ITS Maintenance Work Rescheduled Yates to Yellowdirt 230kV line - Maintenance work to replace/install fiber optic cable will affect the Yates to Yellowdirt 230kV line from 6:00 to 17:00. Update: For the outage of the Pine Grove Primary - SUWANEE (PEF) 230kV TL starting at 10/04/10 06:00 until 10/07/10 17:00 the SOCO-Florida Interface will be reduced to 3300 MW. Thomasville - West Valdosta 230kV TL starting at 06/13/10 06:00 until 06/13/10 17:00 Pine Grove Primary - Twin Lakes 115kV TL starting at 06/17/10 22:00 until 06/18/10 05:00 Yates - Yellowdirt 230kV line starting at 6:00 to 17:00. Yates to Yellowdirt 230kV line starting at 6:00 to 17:00 Yates to Yellowdirt 230kV line starting at 6:00 to 17:00 Pine Grove Primary - SUWANEE (PEF) 230kV TL starting at 10/04/10 06:00 until 10/07/10 17:00 and 10/11/10 06:00 through 10/14/10 17:00. The outage of the Pine Grove Primary - SUWANEE (PEF) 230kV TL will restart on 10/11/10 06:00 and continue through 10/14/10 17:00. Again the SOCO-Florida Interface will be reduced to 3300 MW.

9 ITS Offician Transmission Outage Update: ITS Maintenance Work Ludowici Primary - Riceboro 115kV line - Maintenance work 6:00 to 17:30. : For the outage of the Hatch - Duval 500kV TL starting at 11/12/10 07:30 until 11/15/10 12:00 the SOCO-Florida Interface will be reduced to 1300 MW. This outage will not overlap the outages of the Pinegrove- Suwanee scheduled for 11/08/10-11/11/10 and 11/16/10-11/19/10. s: For the outage of the Hatch- Thalmann 500kV TL starting at 03/04/ :00 until 03/07/ :00 the SOCO-Florida Interface will be reduced to 3200 MW. s: For the outage of the S. Bainbridge - Sub kV TL starting tonight 03/01/2011 at 20:00 until 03/02/ :00 the SOCO-Florida Interface will be reduced to 2500 MW. Ludowici Primary - Riceboro 115kV line 6:00 to 17:30. Duval 500kV TL starting at 11/12/10 07:30 until 11/15/10 12:00 Hatch- Thalmann 500kV TL starting at 03/04/ :00 until 03/07/ :00 S. Bainbridge - Sub kV TL starting tonight 03/01/2011 at 20:00 until 03/02/ :00 s: The Hatch - Thalmann 500kV line will be switch back in service 14:00.SOCO-Florida transfers will be updated. Line Outage notification: Homeland to Macedonia 115kV line. Adding line traps and relocating SW at St. George substation 3/17/2011 at 08:00 OT until 3/24/ :30 OT. : For the outage of the Callaway - Port St. Joe 230kV TL starting Tuesday 05/17/2011 at 7:00 until Friday 05/20/ :00 the SOCO-Florida Interface is anticipated to be 3000 MW. ITS Transmission Outage notification: Construction outage The North Americus 230kV substation is scheduled to be taken out of service March 1 st thru April 9 th for bus reconstruction. Homeland to Macedonia 115kV line. 3/17/2011 at 08:00 OT until 3/24/ :30 OT. Callaway - Port St. Joe 230kV TL 05/17/2011 at 7:00 until Friday 05/20/ :00 North Americus 230kV Substation 03/1/ /09/2012

10 ITS Outage Due to work on the Bio- Center 230Kv Transmission Line, the Hartwell Energy Facility is limited to 120Mw per Unit. Expected duration of work is February 13 to March 4, ITS Outage The Conasauga Mosteller Springs 500kv Transmission line starting July 2, 2012 until Friday, July 6, This will limit deliveries into the ITS from the Murray facility. Until the line is back in service, all deliveries will require TVA transmission service. : Hatch has requested extending the outage of the Hatch Thalmann 500kV TL originally scheduled to end 2/17/13 17:00 until 2/21/13 17:00. The SOCO-Florida Interface will continue be reduced to around 2200 MW for the duration of this outage. The Florida interface will be re-evaluated on a 2-day out basis and may be adjusted in real-time as conditions warrant. Please note that multiple outages are currently contributing to the evaluated Florida interface capacity values. Bio-Center 230kV Transmission Line 2/13/2012-3/4/2012 Conasauga-Mosteller Springs Transmission Line 6/2/2012 6/6/2012 Hatch Thalmann 500kV Transmission Line 2/17/ :00 2/21/ :00 Disclaimer: For Information Only: The information contained in this report represents approved Georgia Transmission Corporation capital projects scheduled for completion over the next several years to expand the Integrated Transmission System (ITS). This report is intended to provide Transmission Customers with a listing of new construction activities on the ITS and is provided on a "For Information Only" basis. Any decision to use and/or rely in any way on this information for any purpose whatsoever is at the user's risk, and the user assumes sole responsibility for any such use and/or reliance as well as for any consequences thereof.

1st Qua u r a ter e M e M e e t e in i g 2nd Qua u r a ter e M e M e e t e in i g

1st Qua u r a ter e M e M e e t e in i g 2nd Qua u r a ter e M e M e e t e in i g 2011 SERTP Welcome SERTP 2011 First RPSG Meeting & Interactive Training Session 9:00 AM 3:00 PM 1 2011 SERTP The SERTP process is a transmission planning process. Please contact the respective transmission