Alan Bates, Guernsey Electricity chief executive officer, said:
"Electricity is now being generated from the 654 panels mounted on the roof of Guernsey Post and is feeding directly into the Island's network, resulting in all islanders benefitting from locally produced solar energy."
Boley Smillie, Guernsey Post chief executive, said:
"Partnering with Guernsey Electricity has been a great success and we're both incredibly proud of the end result."
The panels installed will produce more than 200,000kWh each year, which is equivalent to the electricity required to power Guernsey Post's electric vans, with some energy to spare.
The project progresses Guernsey Electricity's introduction of community scale renewable generation, which is owned and operated by the company.
Source: Guernsey Post