Topic:"Generation Grid Resources" in M12508

Why do this project now? During the May 2025 investigation into the oil leak, broken insulation on the rotor poles was discovered, and the unit has been unable to operate since. The unit is relied on to support water management on the Mers...

AI summary A hydroelectric unit on the Mersey River has been non-operational since May 2025 due to broken insulation on the rotor poles discovered during an oil leak investigation. The unit generates 5.3MW of hydroelectric power and is crucial for water management during high precipitation events.

15 Year Big Falls 5 (MWh) Big Falls 6 (MWh) 2021 25,848 16,660 2022 25,249 27,884 2023 37,011 2,366 2024 24,150 619 2025 (Jan to Aug) 21,341 5,618 16

AI summary The text presents a table showing the energy production (in MWh) for Big Falls 5 and Big Falls 6 from 2021 to 2025 (January to August). The data reflects fluctuations in output over time, with notable decreases in 2024 and 2025 for both units.

NON-CONFIDENTIAL 1 Request IR-8: 2 3 (a) What is the current status of Big Falls Unit 6 and whether it is operating at its 4 expected capacity? 5 6 (b) Please provide a list of all work completed on Big Falls Unit 6 since 2023, along with...

AI summary Big Falls Unit 6 is currently disassembled and out of service, awaiting rotor pole refurbishment. Since 2023, major work completed includes turbine bearing replacement and exciter refurbishment, with associated costs and timelines provided.

place in early 2026 to assess the condition of the stator to ensure no further impact to reliability could be due to this asset. (c) The economic impact of the lower production at Big Falls Unit 6 compared to Big Falls Unit 5 is dependent...

AI summary The text discusses the economic impact of reduced production at Big Falls Unit 6 due to its unavailability, noting that the impact depends on factors like water availability. It highlights that Unit 5 has been running more than usual, making a direct comparison to Unit 5 misleading.

Year Big Falls 5 (MWh) Big Falls 6 (MWh) Combined Generation (MWh) 2021 25,848 16,660 42,508 2022 25,249 27,884 53,133 2023 37,011 2,366 39,377 Seasonally (generally April to September), the Mersey River Hydro system adjusts production fro...

AI summary The table shows the energy generation from Big Falls 5 and 6 over 2021 to 2023. Seasonal adjustments in the Mersey River Hydro system affect unit operations, with Unit 6's unavailability inflating Unit 5's production. Lower precipitation in 2025 reduced the need for both units, minimizing the impact of Unit 6's outage.

Economic impact arises only when inflows exceed the available turbine capacity and water is spilled over the Big Falls spillway. In those conditions, Unit 6's outage can result in lost generation equal to the water that otherwise would hav...

AI summary Economic impact occurs when water is spilled over the Big Falls spillway due to inflows exceeding turbine capacity, leading to lost generation from Unit 6's outage.

Request IR-8: - a) What is the current status of Big Falls Unit 6 and whether it is operating at its expected capacity? - b) Please provide a list of all work completed on Big Falls Unit 6 since 2023, along with the associated cost and com...

AI summary Request IR-8 seeks information on the current status and operational capacity of Big Falls Unit 6, as well as a detailed list of all work completed on the unit since 2023, including costs and duration.