Jan.03 -- In this week's "Commodity in Chief," Bloomberg's Alix Steel talks with Paula Gold-Williams, CPS Energy chief executive officer. The company is the largest U.S. public power, natural gas and electric company, providing service to 804,000 electric and 343,000 natural gas customers in San Antonio, Texas, and portions of seven adjoining counties. Gold-Williams discusses smart cities, solar power and disconnecting from the grid.