Neil Smith has built an energy startup before. 

He joined Intergen in 1995 when it had 20 employees. He retired as CEO in 2016, leaving a global multibillion dollar business with six power stations and hundreds of employees.

Now Smith is trying to build again, this time with Vanguard Renewables, a Wellesley company founded in 2014 that develops waste-to-energy projects. 

The company is still at a relatively early stage, operating six anaerobic digesters in New England, five in Massachusetts…

Boston Biz Journal