CAISO received disputes with respect to Limited Energy Storage Resources (LESR) negative valued generic availability in the Resource Adequacy Assessment Incentive (RAAIM) assessments. This is a defect to the recent release put in Fall 2024.
Research showed that for LESRs there is an issue when computing NGR total bid availability. This latter uses regup, regdown, self-schedule, and energy bids to compute as basis for eventual subtraction of flex usage to get whatever remains for generic. Since flex obligation expanded with negative range recently, the subtrahend became larger. The Energy bid data looks like -10 (lower energy bid) to 10 (upper energy bid), and so the bid on the negative range was not properly captured.
The configuration fix recognizes lower energy bids to resolve the issue. In addition, a floor of zero on the Day Ahead and Real Time availability quantities is put in place to prevent negative results from propagating into final RAAIM assessment values.
For non-generator resources (NGR), including LESRs, the successor charge codes CC 8830 (Monthly RAAIM Settlement) and CC 8831 (Monthly RAAIM Allocation) could be impacted by the change.
This will be a retrospective fix deployed around calendar day 1/8/2025 and settle charge codes for Trade Dates starting 3/1/2023. In accordance with Settlements publishing timeline, various later trade dates can eventually be covered through earlier run cycles (T+24M, T+21M, and so on).