The ability to change the text frequently is one reason why we have chosen to go with “print on demand”. The other is that it has a lower environmental impact as supply matches orders.
The chapter on ISO 50001 has been completely updated as the standard has moved from 50001:2011 to 50001:2018. There have been other updates and corrections throughout the text including checking and updating all the web links in the 800+ bibliography at the end of the book.
The free PDF has been updated as well as the print editions. Please do download the free PDF rather than buy a print version – not only is that more resource efficient but you will always have the up to date version! However, if you absolutely insist on buying a print version, then please do order it through this site.