diff --git a/egret/model_library/unit_commitment/generation_limits.py b/egret/model_library/unit_commitment/generation_limits.py
index ca3ce87c..0628bf56 100644
--- a/egret/model_library/unit_commitment/generation_limits.py
+++ b/egret/model_library/unit_commitment/generation_limits.py
@@ -302,8 +302,8 @@ def power_limit_from_start_stops_rule(m,g,t):
         if not full_range: 
             i = SU_time_limit+1
             if (t-i) >= value(m.InitialTime):
-                coef =  max((value(Pmax) - value(SD[g,t+SD_time_limit]) - sum(value(RD[g,t+j]) for j in range(1,SD_time_limit+1)) - \
-                        (value(Pmax) - value(SU[g,t-i]) - sum(value(RU[g,t-j]) for j in range(1,i+1)))), 0)
+                coef =  max((value(Pmax) - value(SU[g,t-i]) - sum(value(RU[g,t-j]) for j in range(1,i+1))) - \
+                        (value(Pmax) - value(SD[g,t+SD_time_limit]) - sum(value(RD[g,t+j]) for j in range(1,SD_time_limit+1))), 0)
                 if coef != 0:
                     linear_vars.append(Start[g,t-i])
                     linear_coefs.append(coef)