Before reading the next chapters, see:
Annex 1: Units of measure=Power and Energy. From Joule, Watt to MWh (megawatthour)
Annex 2: Yield of 3 MW windturbines in the Netherlands and the UK.
The numbering of the chapters have an index, they refer to Part 1 and Part 2 and via Index1 + 2 you can switch between the Parts.