Platts launches new Daily Renewable Generation Curtailment Indices

The rapid development of solar and wind generation in the California Independent System Operator footprint over the past few years has dramatically altered the pricing dynamics, and even more generation is on the horizon. The ISO curtails renewable generation during periods of oversupply in order to balance the grid. Wind and solar curtailments hit a record level in May 2019.

S&P Global Platts has launched California ISO renewable generation curtailment indices to provide additional market insight around wind and solar curtailment in the ISO, effective December 16, 2019.

The indices will be published in megawatts by calculating daily wind and solar curtailments reported by CAISO against historical CAISO generation.

Platts will publish the following daily indices:

Solar peak curtailment in market data category MD and CAICA00 in category ES.

Solar off-peak curtailment in market data category MD and CAICB00 in category ES

Solar 24-hour curtailment in market data category MD and CAICC00 in category ES

Wind peak-curtailment in market data category MD and CAICD00 in category ES

Wind off-peak curtailment in market data category MD and CAICE00 in category ES

Wind 24-hour curtailment in market data category MD and CAICF00 in category ES

Wind and Solar peak curtailment in market data category MD and CAICG00 in category ES

Wind and Solar off-peak curtailment in market data category MD and CAICH00 in category ES

Wind and Solar 24-hour curtailment in market data category MD and CAICI00 in category ES

Monthly weightings for the month of December are as follows:

Hourly Solar Weightings

HE 1 0

HE 2 0

HE 3 0

HE 4 0

HE 5 0

HE 6 0

HE 7 0

HE 8 0.05

HE 9 0.16

HE 10 0.23

HE 11 0.26

HE 12 0.27

HE 13 0.27

HE 14 0.26

HE 15 0.23

HE 16 0.12

HE 17 0.01

HE 18 0

HE 19 0

HE 20 0

HE 21 0

HE 22 0

HE 23 0

HE 24 0

Hourly Wind Weightings

HE 1 0.06

HE 2 0.06

HE 3 0.06

HE 4 0.06

HE 5 0.05

HE 6 0.05

HE 7 0.05

HE 8 0.04

HE 9 0.04

HE 10 0.05

HE 11 0.05

HE 12 0.05

HE 13 0.05

HE 14 0.05

HE 15 0.05

HE 16 0.05

HE 17 0.05

HE 18 0.05

HE 19 0.05

HE 20 0.05

HE 21 0.05

HE 22 0.05

HE 23 0.05

HE 24 0.05

Hourly Solar and Wind Weightings

HE 1 0.06

HE 2 0.06

HE 3 0.06

HE 4 0.06

HE 5 0.05

HE 6 0.05

HE 7 0.05

HE 8 0.09

HE 9 0.21

HE 10 0.28

HE 11 0.31

HE 12 0.32

HE 13 0.33

HE 14 0.32

HE 15 0.28

HE 16 0.17

HE 17 0.06

HE 18 0.05

HE 19 0.05

HE 20 0.05

HE 21 0.05

HE 22 0.05

HE 23 0.05

HE 24 0.05

These weightings will take effect on December 18 through December 31, 2019. For more information, see the Platts North American Electricity methodology guide located at https://www.spglobal.com/platts/en/our-methodology/methodology-specifications/electric-power/north-american-electricity-methodology.

Please send any feedback, comments or questions to electricityprice@platts.com and pricegroup@spglobal.com.