Calculate up to 20% operating cost for inspection, maintenance and repair. Include a 65% cost for energy and demand to operate the system. For example: At $.06 per kW/hr, the estimated cost of compressed air is $.02 per 100 cfm. A 10 HP air compressor delivering 35 cfm=$0.007/minute, $0.42/hour, $10.08/day, $302.40/month or $3,628.80/year.
For Indian scenarios, please consider USD to INR conversion rates and cost of energy in your selective state.