The world solar energy experts believe that solar photovoltaic (PV) energy in the world will reach 1 terawatt (1000 GW) power during five years. About 95% of 70 organizations have expressed such an opinion. 460 GH solar power plants will be built in the world during four years (2018-2021), more than now. It is assumed that it will able to reach 1 terawatt  power by the end of 2023, 7000 GV until 2030.

Source: Here.