Houston took the top rank this quarter in the U.S. Environmental Protection Agency’s and Green Power Partnership’s top 20 list of local governments that purchase the most green power.

The rankings represent the largest purchasers among local government partners within the Green Power Partnership. According to the official website, the Green Power Partnership is a “voluntary program that supports the organizational procurement of green power by offering expert advice, technical support, tools and resources.” The organization works with both the private and public sectors.

While Houston topped the list with 438 million kilowatt-hours of annual green power usage generated from wind energy, Austin, Texas, was a close second with 406 million kilowatt-hours. Austin [http://www.govtech.com/technology/Austin-Texas-Switches-to-All-Renewable-Energy.html] recently moved to 100 percent clean and renewable energy as a product of wind farms.

According to Green Power Partnership, purchasing figures for the top 20 rankings are based on annualized partner contract amounts (in kilowatt-hours), and not calendar year totals. Rankings are also determined on a quarterly basis. The top 20 are as follows:

City — Annual Green Power Usage (kilowatt-hours)

1. Houston — 438,000,000

2. Austin, Texas — 406,000,000

3. Dallas — 302,880,000

4. District of Columbia — 244,267,000

5. Chicago — 215,000,000

6. Montgomery County, Md., Clean Energy Buyers Group — 134,599,000  

7. Philadelphia — 127,300,000 

8. Suffolk County, N.Y. — 117,000,000

9. Chicago Public Schools — 107,709,620

10. Dallas/Fort Worth International Airport — 87,000,000

11. Austin, Texas, Independent School District — 65,640,000

12. Washington Suburban Sanitary Commission — 59,637,000

13. Forest County, Wis., Potawatomi Community — 54,677,205

14. Los Angeles World Airports — 35,827,829

15. San Jose, Calif. — 31,854,279

16. San Francisco — 31,593,977

17. Chicago Park District — 31,072,406

18. Montgomery County, Pa. — 29,391,000 

19. Nassau County, N.Y. — 29,121,457

20. Santa Monica, Calif. — 28,000,000