FAQ.md

@@ -11,6 +11,8 @@
     * Check your command for spelling mistakes and unwanted spaces. The path to your data may also not contain spaces.
 * **I set a constraint (like emissionCap) to 0, but backbone seems to ignore it.**
     * GAMS does read parameters with the value 0 as if they were not there. To set a constraint to 0, set it to "eps" instead.
+* **I have a powerplant with zero capacity and no investment capacity, but it still shows up in my results.**
+    * If a parameter is 0, backbone treats it as if it was not set. In this case this leads to backbone assigning an infite capacity to your powerplant. Use capacity = eps instead.
 * **I have set an emissionCap/energyShareMax/energyShareMin, but my model does not seem to care.**
     * For these constraints you have to use the invest model. In the schedule model, these constraints are ignored.
 * **I have build a model with integer investments/efficiencies. Backbone never invests or uses more than 100 units, although it would be cheaper.**