<p>A power system stabiliser (19) for stabilising a power generation system (9) having a grid (11) supplying a load (17) where power fluctuations may arise as a consequence of variations in the power generation system (9) or the load (17). The power system stabiliser (19) includes sensors for sensing a property of the power generation system (9), being a grid frequency and/or a grid voltage of the power generation system (9). Power system interface means in the form of a grid interface (21) is also included for electrically connecting with the power generation system (9). The grid interface (21) allows flow of electrical energy between the power system stabiliser (19) and the power generation system (9). Load interface means in the form of a load interface (25) is provided for electrically connecting with a stabilising load (20).The power system stabiliser (19) also comprises a link (29) for electrically connecting the grid interface (21) and the load interface (25).</p>
