Adelphia Gateway LLC has started partial service on its brownfield natural gas pipeline expansion project moving Marcellus Shale supply to growing demand markets in eastern Pennsylvania and beyond, pipeline flow data shows.

Adelphia started flowing on Monday, moving natural gas supply from the Quakertown meter station through the Marcus Hook facility to the Tilghman meter. Receipts at the Texas Eastern Transmission Co. West Rockhill interconnect are at around 8.1 MMcf/d, while deliveries at Peco Energy Co.’s Tilghman interconnect are at 8 MMcf/d, according to Wood Mackenzie.

However, flows are expected to ramp up, Wood Mackenzie analyst Devin Cao said. “This partial service will deliver 31.5 MMcf/d from the West Rockhill receipt to the Peco-Tilghman delivery point,” which...