February 15, 2008 (Computerworld) Green computing promises an enormous win for IT: a chance to save money -- and the environment. Many companies are trying to go greener, but a few truly stand out. Here are the top 12 green user companies, as well as the green dozen IT vendors. For more on the winning users, see the profile stories on each (links below).

The Top 12 Green-IT Users
1. Highmark Inc.
Harrisburg, Pa.
www.highmark.com

2. Discovery Communications LLC
Silver Spring, Md.
www.discovery.com

3. First National of Nebraska Inc.
Omaha
www.fnni.com

4. Perkins+Will Inc.
Chicago
www.perkinswill.com

5. Snohomish Public Utility District
Everett, Wash.
www.snopud.com

6. World Wildlife Fund
Washington
www.worldwildlife.org

7. Austin Energy
Austin
www.austinenergy.com

8. WellPoint Inc.
Indianapolis
www.wellpoint.com

9. Ryder System Inc.
Miami
www.ryder.com

10. Marriott International Inc.
Bethesda, Md.
www.marriott.com

11. Monsanto Co.
St. Louis
www.monsanto.com

12. Wachovia Corp.
Charlotte, N.C.
www.wachovia.com

The Top 12 Green-IT Vendors
1 . IBM
Armonk, N.Y.
www.ibm.com

2. BT Group PLC
London
www.btplc.com

3. Qualcomm Inc.
San Diego
www.qualcomm.com

4. Aplicor Inc.
Boca Raton, Fla.
www.aplicor.com

5. Fujitsu America Inc.
Sunnyvale, Calif.
www.fujitsu.com/us

6. Microsoft Corp.
Redmond, Wash.
www.microsoft.com

7. Hewlett-Packard Co.
Palo Alto, Calif.
www.hp.com

8. Network Appliance Inc.
Sunnyvale, Calif.
www.netapp.com

9. Other World Computing
Woodstock, Ill.
www.otherworldcomputing.com

10. Verizon Wireless
Basking Ridge, N.J.
www.verizonwireless.com

11. Computer Sciences Corp.
Falls Church, Va.
www.csc.com

12. Sun Microsystems Inc.
Santa Clara, Calif.
www.sun.com