Vattenfall AB put Amsterdam's largest rooftop solar project into operation Jan. 16, after installing 17,000 solar panels on the roofs of two industrial buildings owned by property company Merin BV.

The panels will generate 4,350 MWh per annum for Merin, which is aiming to significantly increase its use of renewable energy in the coming years, according to a Jan. 17 news release.

Vattenfall has installed solar roofs on nine Merin-owned buildings in the Netherlands, with total generation corresponding to almost 30% of the property company's overall electricity consumption.

Separately, Vattenfall won a contract to build a new solar farm in Uppsala, Sweden, for property company Vasakronan AB.

Under the contract, Vattenfall will be responsible for the design, installation and operation of one of Sweden's largest solar farms, with 11,000 panels to be installed over about 70,000 square meters.

The solar farm, which will have a total output of about 4.4 MW, is planned to be commissioned before the summer.