Electric car startup Tesla debuted on the public markets this week, raised $226 million for the company, gave the future of green cars a boost, and saw its share leap over 40 percent on the first day of trading.

The founder of solar thermal company eSolar, Asif Ansari, has launched a new company that is looking to sell solar thermal to the next billion. Called Suntrough, this month the startup, will build its first 5.5 MW solar thermal plant in India.

Internet infrastructure giant Cisco announced its energy management gadget this week, which will help consumers monitor and manage their home energy consumption. Like many other large companies, Cisco contracted with Open Peak to brand their home energy device.

Quiet smart grid company Consert brought in big backers this week, including GE, Verizon and Qualcomm. At least one of those backers isn’t surprising — Consert is building home energy management products off of using Verizon Wireless’ 3G network.

What’s the key to the success of some of the recent greentech IPOs like Tesla’s? Well, the good lot of them have had direct support from Uncle Sam.