their largest single energy production source covered by an alternative source in reserve capacity. Currently, NS Power's largest single unit is Point Aconi Generating Station which produces 168 MW of operating capacity. Wreck Cove Units 1 and 2 have an accredited capability of 106 MW each unit (212 MW total), making this facility an important provider of this service. As such, the reliable operation of the Wreck Cove Generating Station provides Nova Scotia Power's ability to meet this requirement. NPCC also requires that operating reserve capacity be available and on the grid within 10 minutes. If Wreck Cove's Units 1 and 2 are off-line, they can be brought onto the grid and reach full capacity within the 10-minute requirement. Tie-Line Regulation Wreck Cove assists with providing tie-line regulation. Nova Scotia Power is required to have reserve capacity available for changes in demand across the tie-line to New Brunswick. Because Wreck Cove is capable of changing its output at the rate of 20 MW/min, it is more effective in responding to fluctuations in Nova Scotia system load and wind generation than slower acting thermal generation sources, which can be moved at a rate of 0.5 MW to 2 MW per minute. Energy Balancing and Wind Following Wreck Cove 1 has been utilized in recent years as a means of balancing energy generation throughout the cycles associated with wind generation. Nova Scotia Power's hydroelectric generation provides load/wind following services, meaning that the hydroelectric generation is dispatchable and can be used to mitigate the impacts resulting from the high variability of wind generation resources and associated forecasting variations. Although wind following was not the original intent for the use of Wreck Cove, having the ability to utilize Wreck Cove in this way has supported the development and integration of wind generation on the grid. This service is related to the Tie-Line Regulation discussed above, but over a longer time frame. The flexibility of Wreck Cove's load response is also critical to managing periods of short term, large scale load changes (pickup and drop-off) from industrial customers on the grid. Grid Reliability Services Load Shaving Capacity Wreck Cove provides critical peak load shaving capacity for the short periods of high load that occur daily, typically during morning and evening peak hours. Given Wreck Cove can be brought on-line quickly for these periods of high load ramping, thermal generation resources which cannot be cycled off-and-on