Gravity Renewables raises $5.5 million

BOULDER – Hydroelectric power developer Gravity Renewables Inc. has closed another large round of funding, according to a filing made with the Securities and Exchange Commission on Thursday. 
  
One year after raising nearly $3.2 million in equity funding, Boulder-based Gravity has sold another $5.5 million in equity to a total of three investors. 
  
The company, based at 1401 Walnut St., owns, operates and develops small hydroelectric power plants. The company buys or leases non-powered dams and adds hydroelectric facilities. Or it buys or leases older plants to refurbish and operate.