NRG Energy is another hulking utility that belches pollution. It's also tiptoeing its way into cleaner energy.
It's going to be testing clean coal, with the help of a big check from the DOE. It's also going to build solar and wind farms.
Read more: http://www.businessinsider.com/the-15-worst-companies-for-the-environment-2009-9?op=1#ixzz3SFVySZJ4