This paper presents the potential use of eggshell powder (ESP) as green accelerator in ground palm oil fuel ash (GPOFA) concrete. Three categories of ESPs namely uncarbonised ESP (UC-ESP), carbonised ESP (C-ESP) and decarbonised ESP (DC-ESP) corresponding to no calcination and calcination at temperatures of 750 and 1000 °C, respectively, were prepared and studied. In addition, ESPs was used as cement replacement (0, 5, 10, 15, and 20 wt%) in GPOFA concrete and their performance were examined in term of reactivity, workability, heat hydration, compressive strength and microstructure performance. It was found that the presence of UC-ESP, C-ESP and DC-ESP can provide a low, medium and superior accelerator behaviour in the early age of GPOFA concrete. Overall, the GPOFA concrete combined with DC-ESP revealed an excellence SiO2-CaO reactivity, giving a twice compressive strength at early age and provides inductive hydration behaviour with low hydration temperature and significant improvement in dense gels formulation. Hence, this study provides a positive impact for rapid construction technology. As a conclusion, modified ESP is a highly potential as partial cement replacement and accelerator for concrete.