Cairn Energy, the parent company of Cairn India, today said the plateau production potential of its Mangala field in Rajasthan has increased 25% to 125,000 barrels of oil per day (bopd).In an operational update issued by Cairn Energy, the company said: "An upgrade of the Mangala Stock Tank Oil Initially in Place (STOIIP) and resources has been submitted to the Rajasthan joint venture and the government of India (GoI)."An FDP addendum will be submitted in 2008 for GoI approval. The addendum will contain a recommendation to increase the Mangala field plateau production rate consistent with the increased potential of 125,000 bopd. This could represent an increase of up to 25% on the Mangala production rate contained in the original FDP submitted in 2005."The increase in the Mangala resource potential has instigated an on-going review to optimise the scale and scope of the Rajasthan development. This review is also addressing ways of mitigating the impact of the increasing cost challenges on the project, which has been driven by the general demand for engineering resources and materials in the industry."Bill Gammell, chief executive, Cairn Energy, said: "The potential of Mangala to produce up to 125,000 barrels of oil per day has led to a review of the optimum scale and scope of the Rajasthan development, and we are confident of achieving first oil in the second half of 2009."Cairn India is the operator of the Mangala field and holds 70% stake, and ONGC holds the remaining 30% stake.