Most of the non-production (running heavy machines) power usage in industries is during the Sunlight Hours.  Using Solar generated power for this can reduce your monthly operating expense.

The lowest cost of a Solar System, and hence the fastest payback, can be got by using a Grid-Tie system.  While this will not have any storage, but it will largely reduce the price being paid to ECG.

The sizing of such a system is dependant on your usage and restricted by the space available for mounting of solar panels