Our JKM forward curve methodology will change beginning December 16 to accommodate new Platts JKM assessments (as explained in the subscriber note https://www.spglobal.com/platts/en/our-methodology/subscriber-notes/092719-platts-proposes-to-launch-seasonal-and-calendar-year-jkm-derivative-assessments).
The general process will be the same, but you will notice a difference in the first three years of the curve as we align with the longer assessments. If you have any questions please reach out to the team at PL_Risk_Production@spglobal.com.