ESB has raised €1bn in a bond sale, which received orders of around €3.5bn.
The money is to be used to finance the company's capital investment programme.
Two €500m bonds were issued as part of the process.
One was a 12 year 4.25% fixed-rate green bond which will be allocated exclusively to finance eligible green projects.
A separate 5 year 4% fixed-rate bond was also issued.
The bonds were bought in the main by investors from across Europe.
"The positive response to our bond issuance demonstrates strong investor confidence in ESB’s Net Zero by 2040 strategy and our ambition to lead the transition to a low-carbon future," said Anne Marie Kean, ESB Group Treasurer.
"Today’s successful bond issuance will allow us to continue to invest in our ambitious capital expenditure programme to support energy security and to lower the carbon intensity of our networks and our generation portfolio leading to a cleaner and more resilient energy future in line with the company’s strategic ambition of Net Zero by 2040."
Among the projects that the green bond funds will be put towards include solar and wind generation as well as battery storage and smart meters.
