The unique properties of graphene render it as a versatile material applying in various energy-related devices. Solar cells with transparent and conductive graphene film as window electrode have exhibited considerable power conversion efficiency. The graphene-based materials used as anode in lithium ion secondary batteries displayed excellent cycling performance and high capacities. Supercapacitors with great potential for practical application have been fabricated as well using graphene-based materials as electrode. Graphene has emerged as a promising two-dimensional nanomaterial for developing economic and efficient energy-related devices. In this review, the recent progress concerning the application of graphene and graphene-based materials in clean energy-related devices has been summarized briefly. Copyright © 2009 John Wiley & Sons, Ltd.