Cairn India reported a quarterly net profit of Rs281cr for 1QFY2011, an increase of 519.3% over the previous year. Revenue grew 310.1% to Rs841cr due to higher production and realisations from the Mangala oil fields. Operating margins expanded significantly to 77% from 64.5% last year due to lower production costs. However, net profit was lower than estimates due to higher financing costs and lower other income. While production and revenues grew strongly year-over-year, costs were also higher than expected, leading to profits below analyst forecasts.