To solve the maximum loadability problem, a population of size 30* 201 is generated. Each firefly presents a small incremental load on PQ buses in addition to base load. Fitness of each firefly is evaluated as in (11) and modified for next iteration corresponding to the brightness of the firefly. After 40 iterations, the solution obtained using FA is modified with LIA which gives the solution. The results are compared with base case for various parameters viz. loading, voltage magnitude and voltage angle. The results are tabulated in Table 9. It is clear from 4th column of Table 9 that the base case has minimum voltage of 0.9287p.u. at bus numbers 282 while it decreases to 0.9 p.u at node 282 using FA+LIA algorithm. The total load on the system is increased to 23.99 pu which is nearly 24 % more than the base case which causes voltage angle to decrease from -37.54 degrees to -57.14 degrees at bus 528.