An affiliate of Energy Transfer LP is appealing an order issued by Pennsylvania regulators last month that prevents the company from filling the Revolution Pipeline with natural gas over ongoing concerns about unstable sections following an explosion in 2018. 

In an appeal filed with the state Environmental Hearing Board, which oversees decisions made by the Pennsylvania Department of Environmental Protection (DEP), ETC Northeast Pipeline LLC called DEP’s order “arbitrary, capricious and unreasonable.”

ETC has been working to bring the pipeline back online for more than two years. However, DEP charged in its order last month that the company violated a consent order and agreement  (COA) signed earlier this year. The COA also required that ETC comply with a conditional...