In December of last year, President Obama issued an order requiring the government to get 20 percent of electricity from renewables by 2020. That’s not exactly an easy goal to achieve.

The General Services Administration, the agency tasked with ensuring the government reaches the goal, owns or leases buildings totaling more than 354 million square feet -- enough space to fill half of Manhattan. It also manages a massive transportation fleet and thousands of people across different regions. Oh, and it must adhere to very strict cost requirements to make sure taxpayers are getting a good deal.

Despite the complexity, the shift is happening. On this week’s show, we’ll talk with Ruth Cox, GSA’s senior sustainability officer, about how renewables and efficiency are greening government buildings while saving taxpayers money.

Later in the show, we’ll have the latest on Hawaii’s effort to both tame and encouragesolar, and we'll take a look at the viability of Solar Roadways.

This podcast is brought to you by SMA, the world's leading solar inverter manufacturer. With more than 850 service experts, 90 service hubs, 30-plus gigawatts installed globally and thousands of commercial and utility projects completed worldwide, SMA is the partner of choice for your PV projects.

The Energy Gang is produced by Greentechmedia.com. The show features weekly discussion between energy futurist Jigar Shah, energy policy expert Katherine Hamilton and Greentech Media Editor Stephen Lacey.