An assessment of the technical and economical aspects of assimilation of wind farms on utility networks shows that wind power can penetrate conventional electricity markets. A computer modelling tool was developed and previously gathered data were statistically analysed. Most electrotechnical constraints can be dealt with through statutory guidelines, especially as control systems are developed. It was also found that although landscape is often considered in planning, more work is needed for controlling noise emissions, electromagnetic interference and bird strikes. Due to improved technology, the costs of wind energy are falling all the time. Production predictions have been shown to be relatively accurate. Through modelling, it is expected that wind energy will have penetrated to gain 30 % of conventional electricity generation by the year 2005. Information generated in these detailed studies accelerates the take-up of renewable wind energies by utilities. One of the tools used to model co-generation and external costs was developed during the project. It is a deterministic model of power flow demand for grid integration. It will allow small and medium sized enterprises (SME) to better tackle new projects in this general area of co-generation of wind energy.