Ireland’s gas regulator has issued a decision paper laying out rules on the price of gas delivery in the country, which could potentially set back plans for the Shannon LNG import terminal.

Developer Hess LNG may now be subject to extra expenditure as all gas providers will be called upon to share increasing costs of UK-Ireland interconnectors, which transport British gas into the country.

The new regime is aimed at preventing customers from having to stump up any more money for their gas as interconnector tariffs rise to cover the cost of falling usage when other entry points are utilised.

To achieve this, projects such as Shannon LNG, which would not be using the interconnectors, will have to bear the increases to some...