Batteries had been widely used as the power source for remote electronic devices, but the method of generating energy from the environment had been with a lot of prospects. To ensure constant power supply and avoid complexity of changing batteries for wireless electronics and sensors, especially in the case of usages in remote areas, self-energy generating devices have become a necessity. The authors briefly review alternative to batteries; options such as electrostatic generation, dielectric elastomers and piezoelectric materials which are considered very promising for their capacity to change stains in the material into electrical vitality and be incorporated into electronic gadgets. The paradigm shift in the technological world towards producing electronic devices with focus on reduction in size, cost and energy consumption have constantly considered the generator based on Micro-electro-mechanical systems (MEMS). This article highlights the impacts and challenges of using MEMs based generators for providing power sources in small wireless sensor nodes, in place of batteries.