Table 1 Historical wholesale energy prices in ERCOT and CAISO

From: Economic, environmental and grid-resilience benefits of converting diesel trains to battery-electric

 

Historical (2017–2019)

 

CAISO38

ERCOT37

Percentage of hours under US$30 MWh–1

60

76

Percentage of hours under US$45 MWh–1

87

91

Average price of eight cheapest hours of the day (US$ MWh–1)

17.5

16.9

Average price of 12 cheapest hours of the day (US$ MWh–1)

20.3

18.4

Average price of eight cheapest hours on the most expensive day (US$ MWh–1)

69.4

44.3

  1. These prices reflect only the price of generation and do not include fast-charging infrastructure, T&D or demand charges. The percentage of hours observed under a specific price point is calculated as the average hourly wholesale price observed for all days in the timeframe.
Back to article page