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Q1: How are the percentage factors for scaling down fixed demand bids being determined for the Day-Ahead Market Trials?
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A1: The current demand bids in production have loss estimated in their values. For the Day-Ahead Market Trial, PJM has been using an estimated percentage to scale down fixed demand bids. The scaling factor is based on PJM’s estimation of that day's dayahead model. During the Market Trial the estimated scaling factor may vary from day to day.
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Q2: In the Day-Ahead Market Trial solution, does total generation committed exceed total Day-Ahead Demand? Specifically, does Generation Committed equal Total DA Demand plus System Losses Implied by the System solution?
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A2: Yes. Generation, Load, virtual bids and offers, transactions and loss will be automatically balanced in the algorithm.
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Q3: In the current DA Market solutions, does Generation exactly equal Day- Ahead Demand (since Day-Ahead Demand is the net of all demand in PJM)?
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A3: Yes. Generation, Load, virtual bids, transactions will be always balanced. We are considering loss in the power balance. But, loss is estimated into the load bids now.
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Q4: Will the Losses be calculated in order to carry out economic dispatch or will it be calculated post-dispatch?
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A4: PJM will apply Marginal Loss in the process of commitment, dispatching and pricing. Real-time penalty factors are calculated based on the real-time SE solution. And Day-Ahead penalty factors are based on the Day-Ahead model.
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Q5: Second, when understanding demand in the Day-ahead and in the Realtime, is a losses component already taken into account (as in an assumed 5% loss) or will the procedure be changed?
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A5: PJM will be de-rating real-time load responsibilities hourly based on that hour’s ratio of state-estimated transmission losses vs. the total zonal load. Your Day-Ahead demand bids should also exclude losses based on the load server’s best guess at losses.
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Q6: My understanding is that PJM is going to select certain Day-Ahead operations and re-run the Day-Ahead Market with marginal losses included and post those results. My question is has this process begun? and if not when? and how will we be notified?
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A6: Yes, PJM is going to re-rerun certain DA markets with marginal losses included in those results.
We will post notification to all market participants via eSuite messaging and eMKT and various PJM majordomos when we plan on generating and posting these results in the PJM sandbox environment.
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