21. Wells Fargo & Company San Francisco, CA | Banking 175 million green kWh, 14% of total power used Like many organizations, Wells Fargo has been purchasing credits to offset some of its prodigious energy use. But as a lender, it has also invested hundreds of millions of dollars in renewable energy projects, among them a wind farm in Texas and a 64-megawatt solar-photovoltaic plant outside of Las Vegas.