The company is seeking to finalize supplementary power-purchase contracts with Rajasthan, Maharashtra, Punjab and Haryana after it finalized a deal with Gujarat to sell power at prices. By Rakesh Sharma and Rajesh Kumar Singh Tata Power Co. expects to soon sign agreements with four Indian states allowing it to charge prices for electricity from its 4-gigawatt plant in Gujarat reflecting higher cost of coal, Chief Executive Officer Praveer Sinha said Wednesday.