French utility Engie and retailer Casino launched a joint venture on Wednesday that will invest some 100 million euros ($115 million) a year to build solar panels on the rooftops of supermarkets, hotels and hospitals in France.
Engie will work with Casino to install solar units with generating capacities of up to 1 megawatt (MW) on retail, industrial and municipal buildings, while continuing to build rooftop solar independently for private homes and large ground-mounted utility-scale solar farms.
The joint venture between Engie and Casino’s solar unit GreenYellow is called Reservoir Sun and hopes to install about 100 megawatts (MW) of rooftop solar capacity per year in France, at a rhythm of about one new installation per day.
France currently has solar generating capacity of 7,660 MW.
“The potential of decentralised solar on rooftops is enormous,” Engie chief executive Isabelle Kocher told reporters on Wednesday at a news conference to launch the venture.
Over the past decade Casino has installed rooftop solar on nearly all its own supermarkets, and in the past few years it has also started selling solar plants to third-party customers, including competing supermarket chains.
GreenYellow chief Otmane Hajji said the firm now has 1 million square metres of solar panels in operation, the equivalent of about 200 MW of generating capacity, of which about 80 percent is at Casino and the rest at customer sites.
He estimates that France has some 500 million square metres of rooftop space available for solar.