Why organisms need to release energy in a series of controlled steps?

In living organisms, energy is needed to carry out the life processes and activities which sustain life. This energy has to be released in a series of controlled steps because that makes it possible to utilize the energy efficiently. If the energy release is not controlled, energy will be continuously released all the time and this will leads to great waste of energy when the energy is abundant and great distress, which can lead to cell death when energy supply is down.