Market price

1776, Adam Smith, An Inquiry into the Nature and Causes of the Wealth of Nations: Book I: Chapter 7: Of the natural and market Price of Commodities The actual price at which any commodity is commonly sold is called its market price. It may either be above, or below, or exactly the same with its natural price.

For those that chose to buy based on their usage (mainly non-franchised freight and open access operators), NR passes on the costs of electricity at the market price for that month, hence the significant increases being experienced by the likes of Freightliner.