The powerhouse, which is part of a $440m expansion project, has been constructed to increase the plant’s generating capacity and improve fish passage over the century-old dam.

The new modern powerhouse will increase the facility’s generating capacity from around 108 megawatts to more than 230 megawatts, while additional capacity is expected to provide power to about 100,000 homes.

PPL fossil and hydro generation senior vice president Victor Lopiano said the project represents a major investment in clean, reliable, renewable energy.

"I thank everyone who was involved in design and construction of the new powerhouse," he said. "This project highlights the potential to upgrade existing hydroelectric facilities and expand capacity without the need to build new dams," Lopiano added.

"The new facility’s two 62.5-megawatt turbines are capable of generating more electricity than the 12 existing turbines, combined."