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Published byDarleen Fowler Modified over 9 years ago
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Demand Side Units with a Maximum Export Capacity < 10MW 1 st February 2010 Michael Peters
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Introduction DSU sites which can offer demand reduction through a combination of: Load Reduction (refrigeration, pumps etc.) Standby diesel generators Inactive CHP plant (possibly seasonal) Sites with large heat load typically have export capacity – but profile still similar to demand only site
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Modification Proposal The demand site shall have a Maximum Import Capacity and shall not have a Maximum Export Capacity greater than the De Minimis Threshold.
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DSU Import Only – Normal Operation LoadCHP M Grid 8 5 3 Maximum Export Capacity = 0 Site Load:8MW CHP Generation:5MW Grid Import:3MW
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DSU Import Only – Load Reduction LoadCHP M Grid 8 5 3 Maximum Export Capacity = 0 Load Reduction of 2 MW Load Reduction:2MW Revised Site Load:6MW CHP Generation:5MW Revised Grid Import:1MW 1 6
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1 DSU with MEC – Normal Operation LoadCHP M Grid 4 5 Maximum Export Capacity 3MW Revised Site Load:2MW CHP Generation:5MW Revised Grid Export:3MW
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1 DSU with MEC – Load Reduction LoadCHP M Grid 4 5 Maximum Export Capacity 3MW Load Reduction of 2 MW Load Reduction:2MW Revised Site Load:2MW CHP Generation:5MW Revised Grid Export:3MW 2 3
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Load Reduction Profile 2MW Load Reduction has the same benefit to the system whether it is reducing demand or “negative demand”
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Why not participate as AGU? Does not capture load reduction potential Gross settlement results in excessive import costs If generation capacity > MEC => Non-Firm Access
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Conclusion The Modifcation Proposal: Encourages greater participation of Large Energy Users in wholesale market through DSUs Furthers Code Objectives through: Development of SEM Promotes competition Promotes long-term interests of consumers
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