I would suggest keep the main article as incineration indicating other terms for incineration as waste-to-energy plant, energy-from-waste plant...etc. Then on the waste-to-energy article have an explanation that in its strict sense it can actually refer to a number of technologies but generally it refers to incineration. I have no preference as to which article forms the basis of the new incineration article. 

There are separate articles on all the other ways of creating energy from waste.