Calculate a customer baseline load using CAISO's 10-in-10 methodology for demand response measurement.

Steps

1. Identify the resource type (e.g. Proxy Demand Resource or Reliability Demand Response Resource) and confirm it uses a day-matching baseline methodology under the CAISO tariff.
2. Collect a historical lookback window (documented on the order of 45 days) of interval meter data preceding the event day.
3. From that window, select qualifying non-event days matching the segment rule — 10-in-10 (10 similar non-event days) is typically used for non-residential customers, with a 5-in-10 variant available for some residential customers.
4. Average the matched days' interval consumption for each corresponding settlement interval to produce the baseline load shape.
5. Apply a day-of load-point adjustment factor, comparing hours immediately preceding the event to the same hours in the baseline, subject to CAISO's documented adjustment cap.
6. Reference the current CAISO Business Practice Manual for Demand Response for the authoritative calculation steps, since CAISO periodically revises this document.