EBS has launched its first green mortgage rate of 2.1%.
It said the four year fixed rate is available to new and existing customers.
It is available to those with a home mortgage whose property has a Builder Energy Rating (BER) of between A1 and B3, and a valid BER cert that is no more than ten years old.
The lender said the rate is available regardless of a customer's Loan to Value (LTV).
EBS said the new rate could result in savings for customers of up to €2,976 per year on their mortgage.
"We’re delighted to launch the first EBS Green Mortgage, which offers eligible customers monthly savings on their mortgage repayments for going green," said Paul Butler, Managing Director of EBS.
"Not only will customers save on their monthly mortgage repayments, but having an energy efficient home means they will also be making savings, all while doing their part for the environment," he added.
According to EBS, customers on a standard variable rate of 3.7% would save €248.02 on their monthly repayments if they switched to the four year fixed rate of 2.1%.
It said this calculation is based on a €300,000 mortgage over 25 years.
As well as offering residential mortgages, EBS offers personal banking and savings services and sells pensions and insurance products on an agency basis.
RTÉ News understands that no decisions have yet been made about what those efficiencies might be and that the review is ongoing, with a final plan expected to be agreed this year.