The backers of three large solar farms have locked in the final piece of their funding puzzle after securing debt financing from a group including the federal government and Commonwealth Bank of Australia.

Local developer Edify Energy and its German investor, Wirsol, will now look to begin work on the farms in Queensland and Victoria and have the first power flowing by early next year.

The $230 million deal finalised on Monday is the largest of its type for a solar project in Australia.

The combined project will add 165MW of renewable energy capacity to the national electricity grid by the start of next year and generate enough electricity to power an estimated 87,000 households.