Process for providing fuel and air and/or an oxygen rich gas to at least first and second units (C1, C2), both of which are oxygen rich gas consuming units comprising: i) separating air in an air separation unit to produce oxygen rich gas, ii) during a first and a second period of time, sending a first stream of oxygen rich gas from the air separation unit to the first oxygen rich gas consuming unit, sending a first stream of fuel to the first unit, removing a first carbon dioxide containing gas from the first unit, the first unit being integrated with a system for the generation of electricity and optionally sending at least part of the first carbon dioxide containing gas or a gas derived therefrom back to the first unit, iii) during the first period of time, sending a second stream of oxygen rich gas from the air separation unit to the second oxygen rich gas consuming unit, the second unit being a combustion unit, at least a second stream of fuel and a first stream of air being supplied to the combustion unit during the first period, removing a second carbon dioxide containing gas from the second unit without sending any of the second carbon dioxide containing gas or any gas derived therefrom back to the second unit, and iv) during the second period of time, at least a second stream of air and a third stream of fuel being supplied to the combustion during the second period, removing a third carbon dioxide containing gas from the second unit without sending any of the third carbon dioxide containing gas back to the second unit characterized in that only during the first period of time, the second stream of oxygen rich gas is sent to the second oxygen rich gas consuming unit and during the second period of time, no oxygen rich gas or a third stream of oxygen rich gas at least 50% less than the second stream is sent from the air separation to the second unit. i) separating air in an air separation unit to produce oxygen rich gas, ii) during a first and a second period of time, sending a first stream of oxygen rich gas from the air separation unit to the first oxygen rich gas consuming unit, sending a first stream of fuel to the first unit, removing a first carbon dioxide containing gas from the first unit, the first unit being integrated with a system for the generation of electricity and optionally sending at least part of the first carbon dioxide containing gas or a gas derived therefrom back to the first unit, iii) during the first period of time, sending a second stream of oxygen rich gas from the air separation unit to the second oxygen rich gas consuming unit, the second unit being a combustion unit, at least a second stream of fuel and a first stream of air being supplied to the combustion unit during the first period, removing a second carbon dioxide containing gas from the second unit without sending any of the second carbon dioxide containing gas or any gas derived therefrom back to the second unit, and iv) during the second period of time, at least a second stream of air and a third stream of fuel being supplied to the combustion during the second period, removing a third carbon dioxide containing gas from the second unit without sending any of the third carbon dioxide containing gas back to the second unit