The supposition that global warming is a myth is fast eroding as new evidence emerge from the scientific world strengthening the argument on climate change with a consensus among opinion leaders and environmental scientists that there appears to be a discernable human influence on the climate. Fossils appear to be the culprit as the use dominates the energy equation sparking off the need for alternative energy sources and accompanying new and efficient technologies. It remains a well established fact that Energy is potentially at the hub of modern civilization and right from Industrial Revolution, technology has refined and redefined the way we use energy. However, technological advancement in all spheres will continue to depend and use energy to progress. This paper describes the experimental testing of a multi-vane expander as the prime mover in a biomass fired organic Rankine cycle system. The expander is a four vane model 6AM-FRV-5A 3kW Gast Air motor manufactured by Gast Manufacturing Inc. The authors have performed an experimental testing where the prime mover will harness power produced by high pressure vapour to generate torque and rotational motion on the shaft and the mechanical energy generated is converted to electricity by means of an automotive alternator. The conversion of low and medium temperature heat from biomass to electricity by using low cost, lightweight and low maintenance expander as well organic substance or hydrofluoroether, HFE 7100 is the subject of this paper. The organic substance, hydrofluoroether (HFE) used is selected because of its thermodynamic properties of having a lower specific volume and higher molecular weight than steam allowing for smaller, less complex, less costly energy applications like expanders and smaller diameter tubes to be employed for low temperature micro system.