The green bond, which matures in 2026, attracted strong institutional investor interest and was over-subscribed five times, the bank said.
Green bonds are used to finance clean energy and environmental projects such as wind farms and low-carbon transport.
The green bond is Barclays' second. The first was issued in 2017 and funded domestic residential mortgage assets.
(Reporting by Nina Chestney; Editing by Kim Coghill)