This is a promo card given away at SPIEL 2011 in Essen. It can be used only for Agricola with farmers of the moor expansion.

The "Biogasanlage" is another Major Improvement card placed at game beginning.

It costs 2 Stones and 1 grain to build.

The text says:

"You can swap grain from your storage to 2 fuel tokens at any time. You have to place this fuel tokens on this card. In the field phase, you can remove as much fuel tokens from this cards as you want and use them for heating your rooms. At the end of the game, you get 1/2/3 points for 3/5/7 fuel tokens on this card."