By Aida Pelaez-Fernandez and Christina Thykjaer MADRID (Reuters) – Spanish power and gas company Naturgy has angered some of its industrial customers by renegotiating long-term gas contracts to match recent price hikes, despite paying the penalties for doing so. Naturgy has unilaterally ended gas supply contracts with companies manufacturing brick and roof tiles in recent months, offering them new contracts with heftier prices, an industry group said on Tuesday, leaving them little time to find alternative suppliers. “The compensation that the utility pays for the termination of its contracts …