From the record
“Renwick Generating Plant, also known as the Municipal Steam Light Plant, is a historical industrial facility located in Renwick, Iowa, United States. Long was an engineer who was contracted in 1914 to design a steam-powered electrical light plant.”
Wikipedia article Renwick Generating Plant, CC BY-SA 4.0.
One of 7 National Register listings published here for Humboldt County · listed in 1995 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service