The £10bn plans to spearhead tidal ­lagoon power projects in Wales could fall apart after the Treasury vowed to tighten its grip on green spending until the pressure on energy bills eases.

The fate of green industrialist Mark Shorrock’s £1.3bn front-runner tidal scheme in Swansea could now depend on whether government believes the plans warrant a place in its industrial strategy, which will be unveiled this week. Experts have warned that without this endorsement the high-cost pioneer project could lose out to cheaper wind schemes in a fierce competition for the remaining £557m of funding still up for grabs.

Richard Howard, an energy expert at Aurora Energy Research, said the Treasury’s decision to offer no new funding once the pot runs dry “does not bode well” for tidal power.