diff --git a/config.default.yaml b/config.default.yaml
index 195990d9..7db6d18c 100755
--- a/config.default.yaml
+++ b/config.default.yaml
@@ -185,7 +185,10 @@ costs:
     offwind: 0.015
     hydro: 0.
     H2: 0.
+    electrolysis: 0.
+    fuel cell: 0.
     battery: 0.
+    battery inverter: 0.
   emission_prices: # in currency per tonne emission, only used with the option Ep
     co2: 0.