De Graaf Logisitcs: Oosterhout, the Netherlands. The storage facility of De Graaf Logistics stretches on and on. De Graaf Logistics is a transport company that sources almost all of its' office and warehouse energy from a 2.5mw windmill on the property. The windmill produces more energy then they can handle and De Graaf uses approximately 20% of the output. The rest is sold back to the grid. Their use of clean energy has attracted new clients and De Graaf has been quick to recognize the benefits, both environmentally and financially, of sourcing clean energy.