The new deal with Electric Ireland will see eight million kilowatts of green electricity per year supplied to the airport.
This latest investment is part of the airport’s push to grow its business in a sustainable manner.
While passenger numbers are expected to increase by over 8% this year, Cork Airport remains on course to continuously reduce energy consumption year on year since 2009.
Commenting on the new deal, Bill Daly, Head of Asset Care at Cork Airport, said:
"Cork Airport has previously won the SEAI Public Sector Sustainable Energy Award and we are currently achieving an annual energy consumption reduction of 48% from a 2006-2009 baseline, independently validated through the SEAI Monitoring and Reporting Programme.
"We are fully committed to developing environmental standards in all areas of our business in order to ensure a safe and efficient airport facility.
"Switching to 100% green energy is a further endorsement of our sustainability agenda at Cork Airport."
Dermot McArdle, Head of Business Markets for Electric Ireland, said:
"We are committed to assisting businesses in meeting their sustainability objectives through significant changes to 100% green electricity.
"As Ireland’s leading electricity, gas and energy supplier to large energy users, Electric Ireland has proven experience in helping users such as Cork Airport.
"Our competitive pricing has also allowed Cork Airport to easily make this switch."