39% of electricity came from renewable sources last month, with solar power reaching new record highs on the national electricity grid, according to provisional figures from EirGrid.
Eirgrid said that March 25 saw a new peak for grid-scale solar power in Ireland with over 750 Megawatts (MW) coming from this source at one point - 18 MW more than a previous record from July last year.
It also follows a new peak wind power record on the grid set in February, Eirgrid said.
Wind power met a third of electricity demand in March, while gas was the single biggest source of electricity generation for the month at 39%, and 18% of demand was met by electricity imported via interconnection.
Alongside renewables, gas-powered generation and interconnection are important contributors towards meeting system demand, particularly at times of low renewable availability, Eirgrid noted.
Overall electricity system demand stood at 3,061 GWh for March, it added.
Last month also saw further records set on the power system, with the highest ever level of discharge from grid-scale battery power sources seen on March 14.
Currently the electricity grid can accommodate up to 75% of electricity from renewable sources at any one time - which is known as the system non-synchronous penetration (SNSP) limit.
Mixing electricity from synchronous (from conventional generation) and non-synchronous (renewables) sources while operating the power system is a very complex task. Ireland's current 75% SNSP limit is among the highest in the world.
Eirgrid noted that while renewable generation reached up to the 75% limit at various points in the month, there were also periods where renewable generation provided for as little as 5% of demand.
Charlie McGee, System Operational Manager at EirGrid, said that March was a landmark month for solar power on the electricity grid.
"While just under 3% of total electricity generation came from solar for the month, during particularly sunny periods this peaked at over 18% which augurs well for further records this summer," Mr McGee said.
"This is made possible by the connection of greater amounts of grid-scale solar as we work towards achieving a cleaner energy future for Ireland's power system," he said.
He also said it was encouraging to see a new peak set for power discharged from batteries on the grid.
"February's wind power record followed by a new solar peak in March shows the need for battery storage so we can hold greater amounts of renewable electricity in reserve for use during periods of high demand," he added.
