A California plant makes the most of green energy with biogas-fueled cogeneration, solar power and a number of energy-saving process innovations.

New-style turbo blowers allow a New York treatment plant to save money for ratepayers and fund collection system improvements

Solar energy brings quick cash flow for a New Jersey utility authority — and power generation with a biogas-fueled microturbine sweetens the deal

A close relationship with the University of Wisconsin helps Madison’s wastewater treatment plant find solutions to challenging problems