  In this article we present an event generator based on the Monte Carlo
program Powheg in combination with the matrix-element generator Recola. We
apply it to compute NLO electroweak corrections to same-sign W-boson
scattering, which have been shown to be large at the LHC. The event generator
allows for the generation of unweighted events including the effect of the NLO
electroweak corrections matched to a QED parton shower and interfaced to a QCD
parton shower. In view of the expected experimental precision of future
measurements, the use of such a tool will be indispensable.
