So these can operate 50km from the end of the electrified network. And that is effectively 25km each way. And that means 20km each way because you don't risk running to within it's limits.
I know there are plans for further electrification, but that makes them useless on the Kildare and Maynooth lines. On the Connolly-based lines they would get to Skerries or Wicklow. And the PR release says it's future-proofing against the electrification not being completed.