Wind and solar batteries are expected to attract $ billion of investment by 2050 , according to a report by Bloomberg New Energy Finance ( BNEF ) . Deep declines in wind, solar and battery technology Rapid increases in the cost of the technology will cause funding to grow considerably over the next three decades , with renewables set to account for 48 % of the world 's electricity supply . The report says wind and solar technology is the least expensive means of adding new power - generating capacity to two - thirds of the world , with that figure expected to grow over the coming decades .
Wind and solar batteries are expected to attract $ billion of investment by 2050 , according to a report by Bloomberg New Energy Finance ( BNEF ) . Rapid increases in the cost of the technology will cause funding to grow considerably over the next three decades , with renewables set to account for 48 % of the world 's electricity supply . The report says wind and solar technology is the least expensive means of adding new power - generating capacity to two - thirds of the world , with that figure expected to grow over the coming decades .