A plant (1) for the production of electrical energy comprising a fluid-bed combustor (2), a water/vapour- recirculation line (3), a line for conveying the exhaust gases (4) of the fluid- bed combustor (2), a vaporizer (5), and a turbine (7) connected to a current generator (8) and driven by the vapour produced. The fluid-bed combustor (2) comprises a first combustion unit (9) in which a fuel with low calorific value is burnt, and a second combustion unit (10) in which a fuel with high calorific value and separate from said first combustion unit (9) is burnt by means of a wall (11) made of a refractory material such that the two forms of combustion do not interfere with one another.