This concise, accessible book offers insights into the first decade of cheap solar power, with a humorous autobiographical thread about how the author became (probably) the world's foremost expert on global solar finance, interspersed with explanations of key financial, economic and technological concepts in solar and the power markets.It is a business book written for people with an interest in energy who do not necessarily have a finance or economics background -- the author did not and had to learn on the way. These might include energy professionals, people considering a career in energy and those who want to be informed about major shifts happening in the world economy. The solar energy sector grew from $11.2bn of annual investment in 2004 to $171.1bn in 2017, and from annual new build of 1.1GW to 99GW in this period and continues to be an increasingly important source of very low carbon energy.