The 500kV power line runs between the Berwick area in Pennsylvania and Public Service Electric and Gas’ switching station in Roseland, New Jersey.

PPL transmission and substations vice-president Stephanie Raymond said: "Susquehanna-Roseland will serve as the model as we plan future transmission projects to benefit consumers."

Electricity grid operator PJM Interconnection said that the new line will help reduce overloads on other existing power lines.

The 101-mile Pennsylvania portion of the transmission line was built by PPL, while the Public Service Electric and Gas constructed the remaining part towards New Jersey. The four-mile segment through National Park Service lands was developed together by the companies.

The three projects created 2,000 construction jobs in Pennsylvania and New Jersey.

Susquehanna-Roseland is one of the seven pilot transmission line projects being developed under President Obama’s Rapid Response Team for Transmission.