Caterpillar Inc. will combine two divisions dealing with power and energy, adding more detail to a restructuring announced last year, and plans to complete this by June 2016, the company said on Wednesday. Caterpillar announced a number of personnel and consolidations, as the company plows forward in an increasingly challenging energy market. Steve Niehaus, currently vice president with responsibility for the Electric Power Division (EPD), is retiring, and in the wake of Niehaus’ retirement…