In this presentation, we will concentrate on the technical means available for achieving high flexibility in coal-fired power plants. This involves providing resilience to frequent start-ups, meeting major, rapid load changes, and providing frequency control duties. Operating at widely variable output increases the wear and tear on equipment and reduces efficiency. However, potential damage mechanisms are well known, and the necessary flexibility can be achieved with acceptable impacts on component life, efficiency and emissions. Designs being developed to enable flexibility in future plants will also be outlined.