In this paper, we investigate EE optimization for SWIPT enabled one-way AF relay networks based on low-complexity TS protocol. We formulate an EE maximization problem, where transmit power control and TS factor allocation are jointly optimized to obtain more performance gains. As the problem is non-convex, we first transform it into a convex optimization problem resorting to fractional programming, which is then solved by a low-complexity iterative algorithm based on alternating convex optimization.