Wind energy is one of the leading renewables technologies, and is now a fast-paced, global and high-value sector. Since the first edition of this book was published, the scale of projects has risen to many multi-GW projects; the number and scale of developers and professionals in the sector has increased exponentially; the size of turbines has gone from around 3.5MW to 15MW+; and the opportunities in new geographies have galvanised the sector. The number of financiers and investors active in the sector has grown correspondingly. With this growth have come challenges, including increasing politicisation, revenue pressures, competition and decreasing returns. New geographies and technological innovations introduce complex additional issues to address.