The tug Glen Cove pushed a barge downriver carrying two massive A-frame structures of corrugated sheet metal. A peek through the binoculars revealed that the A-frames housed four large cylindrical mechanisms. My guess: cooling towers. A quick Google Search took me to the tugster blog for the answer: cooling towers built upriver in Coeymans, NY and destined for a new power plant in Astoria, NY at Steinway Street.