The new £76m term facility has been provided for the 24.7MW Abbots Ripton, 19.3MW Mingay Farm and 32.4MW Ermine Street projects.
The refinancing comprised a long-term power purchase agreement signed with npower.
Octopus Investments portfolio director Giuseppe La Loggia said: "The portfolio contains high quality assets and it’s great to have Barclays’ backing as we continue to invest in solar on behalf of our investors and look to realise returns for them."
Built under the Renewables Obligation subsidy regime, the projects were bought by Octopus in April 2014 from developer Lightsource.
Lightsource served as advisor on the refinancing facility.
Lightsource structured finance director Paul McCartie said: "It is our ambition to achieve more than 1GW of installed capacity by March 2015 and refinancing is an essential component in helping us reach this important industry milestone."
