That's according to a report by Gas Networks Ireland's latest reports.
More hauliers are using cleaner fuel.
Demand for compressed natural gas for use in HGVs and transport fleets rose by almost a third last month, compared to April of last year.
Gas Networks Ireland's latest Demand Report shows gas generated the most electricity in April, after wind dominating in February and March.
President of the Irish Road Haulage Association, and Owner of Hyland Transport in Rosenallis, Ger Hyland, says their organisation is not seeing this: