  A non-perturbative renormalisation prescription for the energy-momentum
tensor, based on space-time symmetries along the Wilson flow, has been proposed
recently in the context of 4-dimensional gauge theories. We extend this
construction to the case of a scalar field theory, and investigate its
numerical feasibility by studying Ward identities in 3-dimensional scalar field
theory. After introducing the Wilson flow for the scalar field theory we
discuss its renormalisation properties and the determination of the
renormalisation constants for the energy-momentum tensor.
