The paper Energy Stability of Explicit Runge-Kutta Methods for Non-autonomous or Nonlinear Problems of David I. Ketcheson and me has been published in SIAM Journal on Numerical Analysis. As usual, you can find the preprint on arXiv.
Many important initial value problems have the property that energy is nonincreasing in time. Energy stable methods, also referred to as strongly stable methods, guarantee the same property discretely. We investigate requirements for conditional energy stability of explicit Runge-Kutta methods for nonlinear or nonautonomous problems. We provide both necessary and sufficient conditions for energy stability over these classes of problems. Examples of conditionally energy stable schemes are constructed, and an example is given in which unconditional energy stability is obtained with an explicit scheme.