Renewable power production can help countries to meet their sustainable development goals through provision of access to clean, reliable, secure, and affordable energy. A number of wind, hydropower and solar photovoltaic capacity power projects were installed worldwide every year in a renewable energy market having capacity more than a hundred billion USD annually. In recent years, an impressive reduction is being seen in renewable energy Portability improvement of technological devices has not been followed by energy accessibility of its batteries. Taking into account the low power consumption parameter of a variety of portable devices, the concept of energy harvesting from environmental sources and human body has gained a new significance. In the search of methods and materials that go with this need, are the energy generated methods from the piezoelectricity, thermoelectricity and electromagnetism. This research gives the ways and future trend of energy harvesting methods, as well as its mechanisms in portable medical devices with low power consumption. In this research, we will focus on energy harvesting. Total illumination is calculated against the total time of harvesting. The experiment has been carried out in an environment which contains some consuming units with total number of rooms. The width and height of the room are considered to be identical i.e. 100×100 having harvesting time of 10 hr. There are three environment in which experiment has been done these are • Sunny • Cloudy • Dark and other type. Total illumination is calculated with and without optimization. ABC (Artificial Bee colony) algorithm is used for the optimization and the results obtained are compared with the without optimization results.