Without the controller, fluctuations in wind power outputs caused stability issues, resulting in the occasional need for turning off the wind turbines, thereby increasing fuel consumption. In combination with PowerStore grid stabilisation system, the MGC600 was able to manage the hybrid energy system, delivering a 29% increase in energy yield, by maximising renewable energy penetration (ABB, 2018). The 7 MW project has an estimated payback period of 4.3 years. Similarly, the success of the solar PV plant at Cronimet’s Thabazimbi mine in South Africa, with its payback period of less than four years, is attributed, aside from financial factors, to the use of a programmable logic control (PLC) system that helps achieve the solar penetration ratio of 60% (Boyse et al.,