[Reuters] Glitnir Bank of Iceland is planning to invest $1 billion in U.S. geothermal energy projects over the next five years in an effort to grab a “big slice” of the nascent alternative energy sector, a bank official said on Wednesday. “The challenges are numerous, but the potential is huge,” Arni Magnusson, managing director of sustainable energy for Glitnir, told a press conference to announce the opening of the bank’s New York office.