What Was Causing That Noise Friday into Saturday on the Conshohocken/Plymouth Border?

Over the weekend we received several inquiries into what was causing the noise from what looked to be the steam plant. We inquired with the Plymouth Township Police Department and received back the following:

According to our records – there was an electrical issue at the plant on Friday – which was causing a loud “hissing” noise. There were no reported fire or safety issues, and the staff was working to rectify the problem.

The inquiries we received shared that the noise continued into Saturday morning (on and off).