A published price based on a survey for a relative delivery location. The published price will occur daily or monthly depending on the named source.

Indexed products may be converted to a Fixed Price or Fixed Basis plus NYMEX for forward months.
 
Indexed price types are typical for incremental supply requirements, or for uncertain usage schedules.  An index is an “after the fact” type of product and is generally the most accurate representation of the current market.  Customers considering indexed products should be aware that there is a low degree of price certainty, and increased exposure to price volatility with this product.