NEW DELHI, Feb 26 (Reuters) -
* India's upstream regulator approves three field development plans involving investment of about $4 billion in an east coast block
* Reliance Industries Ltd RELI.NS owns 60 percent of KG-DWN-98/3, while BP Plc BP.L controls 30 percent and Canada's Niko Resources Ltd NKO.TO holds the remaining 10 percent
* The consortium aims to add peak production of around 20 million cubic metres per day through the three field development plans - BP spokeswoman
* Reliance operates the block