Platts uses reported US MISO solar power RPI data

S&P Global Platts began using actual solar data for the calculation of its Renewable Penetration Index for the US Midcontinent Independent System Operator (MISO). The change was implemented starting on Oct. 15, 2021.

The change was originally scheduled for Nov. 15, 2021. Market participants who require Oct. 15-Nov. 14 data based on the previous methodology can request this data by reaching out to the US editorial power team.

Platts first proposed this change in a subscriber note published on Sept. 30 here: https://www.spglobal.com/platts/en/our-methodology/subscriber-notes/093021-platts-proposes-to-use-reported-us-miso-solar-power-rpi-data.

The change follows MISO's recent decision to start reporting the solar data separately from their non-wind renewable fuel sources.

The change allows Platts to publish more accurate solar RPI calculations for peak and off-peak, as well as more representative data as reported by the ISO for hours 1-24.

It has also affected the daily calculations published in Megawatt Daily, Energy Trader, on Platts real-time fixed pages PEA 904, and AGP 2904, and in the Platts price database under the following codes:

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