Farmer saves $200,000 with poo power

By Ayesha Tejpar
CNN

ROCKWOOD, Pennsylvania (CNN) -- Four generations of Saylors have worked the family's dairy farm for nearly a century, but for the past three years, the cows have been doing something besides providing milk: They've been helping power the place.

Growing up on the sprawling spread 90 minutes from Pittsburgh, 36-year-old farmer Shawn Saylor developed into a self-described science buff.