Miscanthus
From Appropedia
One hectare of Miscanthus or elephant grass yields dry matter with an energy equivalent of 36 barrels of crude oil or about 10000 liter of fuel oil[1] and this every year. It does not require fertiliser, and is insensitive to diseases. One hectare yields about 1600 € per hectare at current energy prices.[2] It does not need to be replanted every year (once planted, it lasts 20 years).
