Bank of Ireland is investing over €5 million in energy-efficient LED lighting for its branches to reduce its carbon footprint.
So far, 114 branches have been completed and the bank expects the remaining branches to be finished by the end of next March.
It said the move will reduce its energy consumption by 60% through the installation of 35,000 energy efficient LED light fittings.
"We are committed to promoting a greener and more sustainable future, and investing in energy-efficient LED lighting is one step in that journey," said Susan Russell, CEO of Bank of Ireland's Retail Ireland division.
"By upgrading our lighting infrastructure, including across our entire branch network, we are not only reducing our environmental impact but also contributing to a more efficient and sustainable operation," she added.
Bank of Ireland has initiated a range of initiatives to minimise its negative environmental impact.
It is planning a phased electrification of its fossil-fuel based space heating systems, further decarbonising operations.
An investment of €36 million in the College Green complex will include upgrading the heating and cooling systems and lighting with energy efficient technologies.
As well an energy efficiency, there bank said there has been a concerted effort across the group to significantly reduce paper usage.
It said 40% of shareholders have signed up for email correspondence alone, which has reduced printing required for the AGM by over 91%.