Revenue and Utilization The 17-vessel fleet generated revenue from fixed rate long-term time charters of $40.0 million in the three months ended September 30, 2010, up 6% on revenue of $37.6 million for the comparative period in 2009. The increase in revenue is due to the purchase of our seventeenth ship in August 2009 and from lower off-hire. During the three months ended September 30, 2010, there were 1,564 ownership days, up 56 or 4% on 1,508 ownership days in the comparable period in 2009. There were no dry-dockings in the three months ended September 30, 2010 and no off-hire days, giving a utilization of 100%. In the comparable period of 2009, there were 16 planned off-hire days for drydocking and four unplanned off-hire days, representing utilization of 98.7%.
For the nine months ended September 30, 2010 revenue was $118.8 million, an increase of 9% on $108.8 million in the comparative period. With one additional vessel, ownership days at 4,641 were up 237 or 5% on 4,404 in the comparative period. Further, off-hire days in the nine months ended September 30, 2010 were two, compared to 58 in the comparative period in 2009 including 16 planned days off-hire for drydocking.
Vessel Operating Expenses Vessel operating expenses, which include costs of crew, lubricating oil, spares and insurance, were $10.9 million for the three months ended September 30, 2010. The average cost per ownership day was $6,992 in the third quarter 2010 compared to $6,565 for the second quarter, up $427 or 7% due mainly to catch up spend on maintenance and higher crew costs. The third quarter 2010 average daily cost was up 3% from the average daily cost of $6,820 for the comparative period in 2009 due to higher spend on maintenance and crew offset by lower lubricating oil consumption from slow steaming and following installation of alpha lubricating equipment on a number of vessels.
For the nine months ended September 30, 2010 vessel operating expenses were $30.7 million or an average cost per vessel per day of $6,612 compared to a total of $31.5 million or an average of $7,156.