Revenue and Utilization The 17-vessel fleet generated revenue from fixed rate long-term time charters of $39.6 million in the three months ended June 30, 2010, up 9% on revenue of $36.2 million for the comparative period in 2009 when one fewer vessel was deployed. During the three months ended June 30, 2010, there were 1,547 ownership days, up 91 or 6% on 1,456 ownership days in the comparable period in 2009. There were no dry-dockings in the three months ended June 30, 2010 and no off-hire days, giving a utilization of 100%. In the comparable period of 2009, there were four unplanned off-hire days, representing utilization of 99.7%.
For the six months ended June 30, 2010 revenue was $78.8 million, an increase of 11% on $71.2 million in the comparative period. With one additional vessel, ownership days at 3,077 were up 181 or 6% on 2,896 in the comparative period. Further, offhire days in the first half of 2010 were two, compared to 38 in the first half of 2009.
Vessel Operating Expenses Vessel operating expenses, which include costs of crew, lubricating oil, spares and insurance, were $10.2 million for the three months ended June 30, 2010. The average cost per ownership day was $6,565 in the second quarter 2010 compared to $6,269 for the first quarter, up $296 or 5% due mainly to catch up spend on maintenance. The second quarter 2010 average daily cost was down 9% from the average daily cost of $7,217 for the comparative period in 2009. The reduction on the prior year is due to lower crew costs from slightly reduced manning and lower lubricating oil consumption from slow steaming and following installation of alpha lubricating equipment on a number of vessels.
For the six months ended June 30, 2010, vessel operating expenses were $19.8 million or an average cost per vessel per day of $6,418 compared to a total of $21.2 million or an average of $7,331 for the six months ended June 30, 2009.