BC HYDRO REAL TIME OPERATIONS OPERATING ORDER 1T 11D. POWER SYSTEM OPERATION FORCED OUTAGES Supercedes 1T-11D issued 03 June 2009

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1 BC HYDRO REAL TIME OPERATIONS OPERATING ORDER 1T 11D POWER SYSTEM OPERATION FORCED OUTAGES Supercedes 1T-11D issued 03 June 2009 Effective Date: 26 August 2011 Expiry Year: 2015 Original signed by: APPROVED BY: Devinder Ghangass General Manager, Real Time Operations Denotes Revision

2 Page 2 of GENERAL This order covers operations of the bulk Power System after forced outage to equipment affecting the bulk Power System. Outage notification requirements and restoration processes are described in this order. Operations after forced outages in the Distribution System are described in separate Distribution Operating Orders. Operations following a major telecommunications outage are described in System Operating Order 7T-20D. Grid Operators, Load Operators, Plant Operators and Designated Stations shall report to the Transmission Coordinator as soon as practicable, all forced or accidental outages in the bulk power system and their causes, occurring within their boundaries. Outages of 25 kv and lower voltage feeder circuits need not be reported unless: The feeder supplies station service to a microwave site, Control Centre, series capacitor station, generating station or a 230 kv or higher voltage station or a station with a tie to another utility. The fault caused an appreciable 'bump' to the transmission system. 100 MW or more load was lost. Generation was lost. Communication and restoration procedures for declared High Level Emergencies are described in OO 6T-00, "Emergency Response Procedures". 2.0 RESTORATION - AUTHORITY Forced outages on Level I and II equipment, which is under the control of Transmission or Generation Coordinator or which requires authorization of the Transmission or Generation Coordinator for operation must not, except as provided in Emergency Orders, be restored without reference to the Transmission or Generation Coordinator, as applicable. Two exceptions are as follows: The HVDC may be restored to previous loading without reference to the Transmission Coordinator when the VI System is tied to the Integrated System via 2L129 and/or 1L18 only. When 5L29 and/or 5L31 are in service, the Transmission Coordinator will authorize loading of the HVDC. The Transmission Coordinator may give permission to a Grid Operator or Designated Station for manual reclose (reference OO 1T-29A) without reference to Transmission Coordinator if auto reclosing is disabled for some reason. Also, if Live Line Permits are in effect and can be returned in time (reference OO 1T-29A) permission may be granted for one manual reclose on any circuit. Forced outages on equipment which normally requires 'prior notification' (i.e. Level III) of the Transmission or Generation Coordinator to operate, but which have resulted in power outages to customers, can be restored by Grid Operators and Designated Stations without prior reference to the Transmission or Generation Coordinator, provided the Grid Operator or Designated Station has assurance that the disturbance is localized. However, all load that was shed by underfrequency relay shall not be restored without permission from the Transmission Coordinator pending notification from the Western Electricity Coordinator Council Reliability Coordinator (WECC RC).

3 Page 3 of RESTORATION REPAIR PROCEDURE Whenever Transmission System equipment is forced out of service and has the following impact: customers are without power, transmission service is curtailed by more than 100 MW or if Marketer(s) can demonstrate real hardship due to the curtailment, BCH will be in violation with Applicable Laws, Applicable Reliability Standards, or Regulatory requirements. Real Time Operation staff (RTO) will call out BC Hydro Field Operations to investigate and make safe the Transmission System equipment as soon as possible. For repairs under $5K, BC Field Operations will charge their work to an appropriate Corrective work order in accordance with BCH Asset Management business rules to capture such cost. For repairs exceeding $5K, work on the above types of critical outage will continue but Field Services will consult and coordinate with Asset Management at the earliest opportunity to optimize a repair strategy. For transmission line outages, response will be in accordance to BCH Standard For permanent sustained outages to BCH Distribution Substations and Transmission Voltage Customers whose operations are continuous around-the-clock it is intended that repair work will be performed in a manner that will restore service as quickly as feasible. The BC Hydro Field Manager will provide an initial Estimated Restoration Time (ETR) to the Control Centre to be communicated to the Customer. The Control Centre will be advised by the Field Manager if the ETR changes or every 4 hours to confirm accuracy and the Control Centre will advise the Customer of any updates. A resource plan will be developed by the BC Hydro Field Manager in conjunction with BCH Asset Program Management to ensure the return to service is achieved as soon as safely possible. This resource plan will include strategies such as working around the clock if circumstances and safety permit. For non-critical outages, RTO will notify BC Hydro Field Operations to assess and stabilize the situation so that repair of equipment can be delayed until the next working day. BC Hydro Field Operations will charge this work to an appropriate Corrective work order in accordance with BCH Asset Management business rules costs under $5K. No single work can exceed $5K without approval from Asset Management. If Asset Management decides not to approve the work exceeding $5K, they will notify RTO and provide reasons for not proceeding. 4.0 SPECIAL REPAIR PROCEDURE Some major repair of damaged plant/equipment may require special planning, organization and communications, involving other participants and stakeholders. These major repairs are: Very expensive typically costing $1M or more Very complicated or extensive typically more than 4 weeks to complete The flow chart in Appendix 1 should be used for major repair processes. 5.0 TRANSMISSION LINE FAULT LOCATING Transmission Coordinators are responsible for reporting Level 1 and 2 transmission line forced outages and the Grid Operators and GMS OAD s are responsible for reporting Level 3 and 4 transmission and sub-transmission line forced outages in CROW.

4 Page 4 of 5 The Transmission Coordinator will ensure that Grid Operators have initiated appropriate action whenever Levels I and II major transmission lines do not reclose successfully. The Transmission Coordinator through the Grid Operator will provide any available FLAR fault location information to the Field staff and enter it in CROW. For any inter-area transmission lines that do not reclose successfully, the Control Centre will notify the appropriate BC Hydro Field Operations Manager(s). If more than one BC Hydro Field Operations Manager is notified, they will have joint responsibility to coordinate patrols and fault location. One FO Manager shall take the lead role and that person shall be named to the Control Centre promptly for coordinated communications regarding progress, plans and priorities. After the fault location has been confirmed, the FO Manager for that area shall be responsible for making repairs and for informing the Control Centre of the estimated outage duration. 6.0 REPAIR OF FAULTED GENERATION PLANT Repair to a generating plant is the responsibility of the Generator Owner. BC Hydro Plant Manager shall keep the Control Centre informed on the condition and status of repairs to a BC Hydro generating plant, either directly or through the Designated Stations. If a generating plant is critical to maintain the reliability of the Transmission System, repair of the generating plant shall be given a high priority. 7.0 REVISION HISTORY Revised by Revision Date Summary of Revision TCSF 15 September 2005 Major revision. DSG 4 Oct 2005 Clarified what RTO stands for and clarified responsibility for creating CROW entries. AW 15 January 2008 Section 3 updated for BCH Standard and procedure for returning customers that have 24 hour operations to service AW 4 February 2008 Section 3 updated AMS 03 June 2009 Updated for SCMP. DSG 26 August 2011 Updated after BCH/BCTC merger

5 Appendix 1 - Major Incidence Repair/Communications Flow Chart OO 1T-11D Page 5 of 5 Incident Control Centre dispatches Field Operations crews to obtain information. Crews will secure and make safe the site, restore customers to the extent possible, and perform damage assessment. If BC Hydro System Control Manager deems necessary, initiate Telephone Conference Call with 1) BC Hydro Asset Management 2) Field Operations 3) System Planning (optional) to conduct situation assessment. Project Sponsor assigned from BC Hydro Asset Management 1) Control Centre will inform DLoB of any significant impact or additional risk to their customers, including TVCs and their respective KAMs. 2) Control Centre will inform GLoB and IPPs of any significant impact or additional risk to their plants. Note: BC Hydro SOC must not be violated if transmission information is provided. Project Sponsor; 1) Arranges for Funding 2) Coordinates with Planning to rebuild or to modify 3) Prepares Repair Plan and Contracts 4) Prepares Communication Plan 5) Appoints Project Manager Project Manager manages the repairs and communications with stakeholders. Project Manager must be available during crucial stages of the project.