diff --git a/power/Power.i b/power/Power.i
index aaf3ff23..a99b181e 100644
--- a/power/Power.i
+++ b/power/Power.i
@@ -60,7 +60,8 @@ instance_power(Instance *inst,
 	       const Corner *corner)
 {
   cmdLinkedNetwork();
-  PowerResult power = Sta::sta()->power(inst, corner);
+  Sta *sta = Sta::sta();
+  PowerResult power = sta->power(inst, corner);
   FloatSeq powers;
   powers.push_back(power.internal());
   powers.push_back(power.switching());
@@ -73,14 +74,16 @@ void
 set_power_global_activity(float activity,
 			  float duty)
 {
-  Sta::sta()->power()->setGlobalActivity(activity, duty);
+  Power *power = Sta::sta()->power();
+  power->setGlobalActivity(activity, duty);
 }
 
 void
 set_power_input_activity(float activity,
 			 float duty)
 {
-  return Sta::sta()->power()->setInputActivity(activity, duty);
+  Power *power = Sta::sta()->power();
+  return power->setInputActivity(activity, duty);
 }
 
 void
@@ -88,7 +91,8 @@ set_power_input_port_activity(const Port *input_port,
 			      float activity,
 			      float duty)
 {
-  return Sta::sta()->power()->setInputPortActivity(input_port, activity, duty);
+  Power *power = Sta::sta()->power();
+  return power->setInputPortActivity(input_port, activity, duty);
 }
 
 void
@@ -96,21 +100,24 @@ set_power_pin_activity(const Pin *pin,
 		       float activity,
 		       float duty)
 {
-  return Sta::sta()->power()->setUserActivity(pin, activity, duty,
-					      PwrActivityOrigin::user);
+  Power *power = Sta::sta()->power();
+  return power->setUserActivity(pin, activity, duty, PwrActivityOrigin::user);
 }
 
 void
 read_vcd_activities(const char *filename,
                     const char *scope)
 {
-  readVcdActivities(filename, scope, Sta::sta());
+  Sta *sta = Sta::sta();
+  cmdLinkedNetwork();
+  readVcdActivities(filename, scope, sta);
 }
 
 void
 report_vcd_waveforms(const char *filename)
 {
-  reportVcdWaveforms(filename, Sta::sta());
+  Sta *sta = Sta::sta();
+  reportVcdWaveforms(filename, sta);
 }
 
 // debugging
@@ -118,7 +125,8 @@ void
 report_vcd_var_values(const char *filename,
                       const char *var_name)
 {
-  reportVcdVarValues(filename, var_name, Sta::sta());
+  Sta *sta = Sta::sta();
+  reportVcdVarValues(filename, var_name, sta);
 }
 
 %} // inline