HOMER Energy Support

Diesel O&M costs

Last Updated: Mar 19, 2018 04:12PM MDT

The diesel O&M cost is a critical factor in HOMER Pro analyses, and we know frustratingly little about it.  For diesel generators, I typically assume an O&M cost of about 2 US cents per kWh at rated output.  That would be $1/hr for a 50 kW diesel.  HOMER assumes that the O&M cost per hour is independent of the power output, so that 50 kW diesel would cost $1 per hour of operation whether idling or running full blast.

HOMER Pro calculates the annual O&M cost of the diesel by multiplying the hourly O&M cost by the operating hours per year.  In a diesel-only system, that 50 kW generator would run full time and the O&M cost would be $8,760/yr.  In a wind-diesel-battery system if it ran only 3,000 hours per year, its O&M cost would drop to $3,000/yr.

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