There has been some interesting research released last week indicating that the Green IT Services market is likely to reach $5 billion by 2015.  The report said the growth "...in the market will be primarily driven by factors, such as, greater focus on data center optimization, widespread adoption of Green IT initiatives beyond data centers, and development of new green management software technologies, among others." 

And said the key players in this market (to the suprise of no-one) are: "...Accenture PLC, BT Global Services, Deloitte, Global Green Consulting Group, Inc., GreenIT, HCL Technologies, Ltd., Hewlett-Packard Company, HP Enterprise Services, International Business Machines Corporation, SustainableIT, Tata Consultancy Services, Computer Sciences Corporation, Dell, Inc., Getronics NV, Intel Corporation, Oracle, and Wipro Systems and Technology Division."

Read the press release