Drax dropped from index of green energy firms amid biomass doubts

Doubts over sustainability of company's wood-burning power plant mount within financial sector

Drax has been booted from an investment index of clean energy companies as doubts over the sustainability of its wood-burning power plant begin to mount within the financial sector.

The FTSE 100 energy giant, which has received billions in renewable energy subsidies for its biomass electricity, was axed from the index of the world's greenest energy companies after S&P Global Dow Jones changed its methodology.