Turkish energy company Unit International has reached a $4.2b deal with the Iranian Energy Ministry to build seven natural gas power plants in Iran, in what it said was the biggest investment in Iran since the lifting of sanctions, Reuters reported.

The power stations will be built in seven separate regions of Iran, and would have a combined installed capacity of 6,020 megawatts, Press TV wrote. According to Unit International’s owner, Unal Aysal –the former Chairman of major Istanbul soccer club Galatasaray– when completed, the power plants would meet 10% of Iran’s energy needs.

Construction of the seven plants was planned to begin in the first quarter of 2017.