RICHMOND, Va. (AP) — The developers of a disputed natural gas pipeline on the U.S. East Coast are considering a major expansion of the project into South Carolina, according to remarks made by an energy company executive and interviews with others in the industry.

Opponents of the Atlantic Coast Pipeline said that raises questions about whether Dominion Energy, the project's lead developer, has withheld important information from the public and whether the pipeline is even needed as initially proposed. But business leaders say the pipeline would help lower energy costs and boost economic devel...