1. Offshore wind resource
   1. wind in the sea
   2. waves in the sea
   3. spatial planning
2. Offshore wind technologies
   1. Wind turbines
      1. >5MW
      2. <5MW
   2. Substructures
      1. Fixed bottom
         1. Monopiles
         2. Tripiles/Tripods
         3. Gravity based
         4. Jackets
      2. Floating
   3. Inter array Grid connection
   4. environmental impacts
      1. construction phase
      2. monitoring
3. Delivery of electricity
   1. Grid connections to the shore
   2. Electricity markets