NOVELTY - Crushed waste is compacted into blocks.    USE - For preparing solid fuel blocks which can be burnt to generate electricity.    ADVANTAGE - A wide variety of waste, including domestic refuse, fats, bands, non-recyclable paper and cardboard, waste wood, sludge from sewage works, abattoir waste, building waste, rubble, leaves, foliage, processed oils and manure can be used to form a useful end product that avoids the expense of flue gas treatment associated with waste incinerators.    DETAILED DESCRIPTION - A method for preparing fuel from waste materials comprises crushing domestic and/or industrial waste and then compacting the resulting particles into blocks.    INDEPENDENT CLAIMS are also included for;    (1) A method for burning the fuel, in which it is converted into a powder immediately before burning, and    (2) A fuel production installation with waste supply devices (2, 3, 6-11, 13), waste crushing devices (13-27), a press (30) for producing blocks with a volume less than 1 m3, and a drying device (32) for the blocks.    DESCRIPTION OF DRAWING(S) - Figure 1 shows a block diagram showing the processing of different waste materials to give a solid fuel end product.    Waste treatment installation (1)    Domestic waste supply (2)    Commercial waste supply (3)    Supply of fats which can not be recycled economically (4)    Supply of bands and other rubber material (5)    Supply of paper and cardboard which can not be usefully recycled (6)    Supply of general waste, e.g. wood from the wood processing industry (7)    Supply of sludge from sewage works (8)    Supply of abattoir waste (9)    Supply of non-recyclable building rubble (10)    Supply of biowaste, e.g. leaves and foliage (11)    Supply of processed oil (12)    Supply of manure (13)    Shredders (14-27, 33)    Building waste and rubble sorting device (29)    Compaction line (30)    Drying device (32)    Magnet devices for removing metal (34, 38, 45, 48, 51, 60, 61)    Discharge exits for material not of use for preparing fuel (35, 39, 46, 49, 52, 60, 62, 63)    Waste supply lines (36, 40, 44, 47, 50, 53, 58, 64, 65, 69, 73, 78)    Central mixing line (37)    Storage tanks or bunkers (41, 55, 70)    Mixers (42, 56, 67, 75)    Supply bunkers (43, 57, 64, 68, 72, 77)    Exit for crushed wood (54)    Supply of abattoir waste for further processing (59)    Aeration devices (63, 76)    Supply of biowaste for further processing (66)    Fraction separation device (71)    Supply of thick manure fraction for further processing (74)    Discharge for blocks of fuel (79)