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Treatment of Combined Cycle Generation and Related Aggregation Issues (MR-00121)

Treatment of Combined Cycle Generation and Related Aggregation Issues (MR-00121). John MacKenzie. Combined Cycle Gas Turbines (CCGT) Description.

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Treatment of Combined Cycle Generation and Related Aggregation Issues (MR-00121)

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  1. Treatment of Combined Cycle Generation and Related Aggregation Issues (MR-00121) John MacKenzie Market Operations Standing Committee of the IMO

  2. Combined Cycle Gas Turbines (CCGT) Description A gas turbine-driven generator produces electricity. Hot exhaust gases from this turbine are directed to a heat recovery steam generator, which is then fed into a steam turbine generator that produces additional electricity. Market Operations Standing Committee of the IMO

  3. Issue • While the gas turbine and steam turbine generators are a single facility, their electricity output may be incorporated to the grid at different connection points. • If aggregated across multiple connection points, IMO unable to predict individual circuit flows and perform accurate security assessments. Market Operations Standing Committee of the IMO

  4. Scope • Two existing CCGT NUGs have been denied aggregation under the market rules. • Existing CCGT NUGs registered as Transitional Scheduling Generators, which allows self-scheduling. After PPAs are renegotiate must re-register as either dispatchable, self-scheduling or intermittent. • CCGTs are becoming increasingly the technology of choice. • Similar aggregation issue has been suggested exists for “cascade” river generating stations. Market Operations Standing Committee of the IMO

  5. Potential Solution • Allow facilities to submit one offer and receive one dispatch instruction for entire facility, but also require facilities to submit extra information (in addition to what is already required in the market rules) in the form of allocation rules. • One offer together with allocation rules would allow IMO to perform accurate security assessments. • Allocation rules also used by MP to translate single dispatch instruction • IMO conducting high level technical feasibility impact assessment over the summer. Market Operations Standing Committee of the IMO

  6. Implementation Issues • Changes required to IMO and MP systems: $ and time • Operational and revenue telemetry • Compliance with dispatch instructions • CMSC and other settlement issues • Application to other types of generation e.g. cascade river plants • Other?? Market Operations Standing Committee of the IMO

  7. Feedback Requested • Does the potential solution meet the needs of the market? • Are there other potential solutions? Market Operations Standing Committee of the IMO

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