“…Some of them used battery as backup power, which become expensive; while others don't have any plan for backup power. Some authors have shown that it is more economical if solar and/or wind is used in combination with biogas to form the micro-grid [3], [5], [7], [10]- [12], [14]- [16], [18], [20], [23], [46]; depending on the location type it is suitable to use wind , solar, biogas for power generation but what if the stored battery power is consumed, grid is not available for much time.Also, most of these microgrids require separate locations for both solar and biogas power plants, and this may increase the land need inciting added capital expense. Optimal sizing of the system with different renewable sources based on availability and demand using various multi-objective functions are shown in [1], [2], [5]- [7], [9], [10], [15], [16], [18], [19], [22], [47], [48], [50], [51] but there are no provisions for exigencies.…”