diff --git a/gamedata.cpp b/gamedata.cpp
index b170161..4c084d9 100644
--- a/gamedata.cpp
+++ b/gamedata.cpp
@@ -138,7 +138,8 @@ bool GameData::add_vertex(int x, int y, int z, int r, int colour)
 	energy_cost = 25;
 	break;
     case VERTEX_PRODUCER:
-	energy_cost = 25 + (25 * num_vertices_by_type(build_type, turn));
+	if (num_vertices_by_type(build_type, turn) == 0) energy_cost = 0;
+	else energy_cost = 25 << (num_vertices_by_type(build_type, turn) - 1);
 	break;
     }
 
diff --git a/player.cpp b/player.cpp
index e6f9812..620c04f 100644
--- a/player.cpp
+++ b/player.cpp
@@ -4,7 +4,7 @@ Player::Player(string name, unsigned int colour)
 {
     this->name = name;
     this->colour = colour;
-    energy = 25;
+    energy = 0;
 }