The Glenwood Power Plant (also known as the Yonkers Power Plant) was constructed circa 1904-06 and shut down circa 1963. It sits next to the Glenwood railroad station. The plant had sat abandoned for quite some time when I went to photograph it. To my pleasant surprise on the day of my visit, we saw work being done to renovate/reuse the building! I am unsure of its current status.
More information: Goran Group (real estate developer)
Location: Google Maps