Sentence:  At about the time the Marsden enterprise was getting under way , the Vail Light and Lumber Company started construction of a chair stock factory on the site of the present Bennington Co-operative Creamery , intending to use its surplus <WSD>power</WSD> for generating electricity . 
Meaning of the word marked with <WSD> tags:  (physics) the rate of doing work; measured in watts (= joules/second)