Atlantic Coast Pipeline, formed by Dominion ( D ), Duke Energy ( DUK ), Piedmont Natural Gas ( PNY ) and AGL Resources ( GAS ), formally applied to the Federal Energy Regulatory Commission for permission to build a 564-mile interstate natural gas transmission pipeline designed to meet the need for cleaner electricity generation, satisfy the growing demand for natural gas to heat homes and businesses, and promote consumer savings and economic growth.
In the context of the input sentence, determine the relationship between 'Duke Energy' and 'electricity'.
Options: distribution format, brand, chief executive officer, product/material produced