An apparatus for generating electricity

An apparatus for generating electricity comprises: a housing and, mounted in the housing, a hydrogen fuel cell and a chemical reactor for producing hydrogen to supply the fuel cell to enable the fuel cell to generate electricity; and a power outlet to which an electrical power consuming device can be attached; wherein the chemical reactor comprises: upper and lower body sections connected together so as to enclose a reaction chamber, the upper and lower body sections being separable to allow the introduction of one or more chemical reactants into the reaction chamber and being re-connectable to form a gas tight seal therebetween; a removable liner disposed inside the reaction chamber and being supported within the lower body section; the removable liner being removable from the reaction chamber when the upper and lower body sections are separated; and wherein the reactor has a liquid inlet for introducing a liquid which serves as a liquid reactant and/or liquid reaction medium into the removable liner; and a gas outlet through which hydrogen gas can exit the reaction chamber for onward flow to the hydrogen fuel cell. The apparatus may additionally comprise a power outlet to which an electrical device may be attached; the removable liner being annular in shape and capable of containing one or reactants; a gas outlet; and a liquid inlet. A method of use of the apparatus is also disclosed.