The Oscillating Water Column wave energy harnessing method is considered as one of the best techniques of converting wave energy into electricity using self-rectifying turbine. A new way is developed for selecting alternative materials for the turbine blades. The approach taken was a combination of adapted value engineering techniques and the Cambridge Material Selector based method. Using this approach allowed the user to combine the strength of each separate method, allowing the material selection process to be streamlined. The material selection exercise indicated that the optimum material for manufacturing an impulse turbine blade would be titanium alloy, with nickel alloy in second place. However cost and manufacturing practicalities need more detailed consideration before a final decision is made.