The solar field
Riddle location 4.
Strange but true
Originally (1978) this site was bought to carry out wind power tests to prove that wind power is NO ALTERNATIVE to the then propagated ATOMSSTROM. Later, solar panels were tested here.
To the riddle
Take the Jack of Clubs from your deck and note the vehicle depicted on it.
Now follow the path on the drawing above. Now count the small tiles that are on a large solar panel.
Add the two numbers and enter the result.