Grid computing are integrated environments in which software and hardware resources are pooled in ways that give any user the impression of working with a single fast computer. This paper examines the current advances in grid computers from the point of view of their structures, global attention and support. With the advancement of technology, the working of grid based computations have been simplified where each computer's resources are shared with every other computer in the system. The major resources that are considered to be vital in the grid computing platform are the processing power, memory and data storage. These are treated as communal resources rather than as individual resources and thus promoting resource sharing for all the authorized users. This provision helps to perform on-demand services over the Internet and supports a wide variety of applications that requires huge processing power and heavy storage for data. One of the challenges due to this sharing platform that provides services on adhoc basis is to maintain sustainability. The main goal of this paper is that discuss a model that is at the conceptual level and directing it for further research.