Process for producing mono-olefins from a paraffin-containing hydrocarbon feed, comprising partially combusting a mixture of the hydrocarbon feed and a molecular oxygen-containing gas in contact with a catalyst capable of supporting combustion beyond the normal fuel rich limit of flammability and subsequently separating the products of the combustion. Energy for the separation is provided by a cogeneration process which simultaneously produces thermal energy and mechanical energy by combustion of fuel. The mechanical energy is converted to electricity, and the thermal energy is used to create steam for use in a steam turbine.