Bangladesh is the 7th largest population (164.4 Million) and 12th density of population (1034/km2) country in the world. Bangladesh is one of the most electric deprived countries. Electric energy protection is performed of decreasing the quantity of energy used in day by day. Bangladesh is a developing country, so their demand of electricity increases tremendously. Energy preservation is the result of financial capital increase of the country and also increases the environmental values. Normally maximum electric energy generated by fossil fuel, gas, coal etc, which is created air and water pollution and also negative impact on global calamity. That’s why the peoples are focus on power generation system. Non renewable energy source like fuel, gas, coal are limited and it is important to reserve this sources for our future generation. There is large prospective for renewable energy source in Bangladesh, currently their contribution to the electric supply remaining insignificant compare to our total supply. The aim of this research is developed an alternative energy generation technology such as hybrid system of renewable energy for sustainable future. When Hybrid systems are used in remote areas, there will be coupled with diesel generators for system reliability. In this proposal, I analyze wind-diesel generator-battery, wind-Photovoltaic (PV)-diesel generator-battery, Photovoltaic (PV)-diesel generator-battery hybrid system in the rural and isolated island areas of Bangladesh.