Present study deals with a holistic approach to bioenergy production from a single-celled green algae Chlorella pyrenoidosa aiming to valorise all biomass components. In the first phase, the microalgae biomass was used to produce biodiesel in a microwave-assisted biodiesel reactor by in situ transesterification process. The biomass residue left after biodiesel production was pyrolyzed in a fixed bed pyrolysis reactor at various isothermal temperatures (400, 450, 500, 550, and 600°C) in second phase. The pyrolysis reaction results revealed that the highest bio-oil yield was 35.33 wt% along with 51.23 wt% biochar and 13.44 wt% pyrolysis gas at 500 °C. FTIR and GC–MS analyses of bio-oil confirm the existence of hydrocarbons as well as oxygenated chemicals like esters, phenols, and acid derivatives. Furthermore, the fuel properties of bio-oil as well as biodiesel e.g. viscosity, density, calorific value, flash point, and pour point were determined using standard procedures (ASTM D6751–02, EN–14214, and IS) and confirmed to be appropriate for stationary engine application. On the other hand, the biochar characterisation showed that it holds good potential for usage as a biocoal in industrial boilers/power plants or cooking stoves. Hence, this study demonstrates the utilization of Chlorella pyrenoidosa microalgae for production of eco-friendly renewable fuels as well as a wide range of value-added co-products with a zero-waste biorefinery approach.