diff --git a/include/sta/Sta.hh b/include/sta/Sta.hh
index 0c176ba4..3bd008cf 100644
--- a/include/sta/Sta.hh
+++ b/include/sta/Sta.hh
@@ -1257,7 +1257,9 @@ public:
   virtual void disconnectPin(Pin *pin);
   virtual void makePortPin(const char *port_name,
                            PortDirection *dir);
-  // Notify STA of network change.
+  // Notify STA that the network has changed without using the network
+  // editing API. For example, reading a netlist without using the
+  // builtin network readers.
   void networkChanged();
   void deleteLeafInstanceBefore(const Instance *inst);
   void deleteInstancePinsBefore(const Instance *inst);
diff --git a/power/Power.cc b/power/Power.cc
index 6cc8795f..94d6fccf 100644
--- a/power/Power.cc
+++ b/power/Power.cc
@@ -1795,15 +1795,7 @@ Power::clockMinPeriod(const Sdc *sdc)
 }
 
 void
-Power::deleteInstanceBefore(const Instance *)
-{
-  activities_valid_ = false;
-  instance_powers_.clear();
-  scene_ = nullptr;
-}
-
-void
-Power::deletePinBefore(const Pin *)
+Power::powerInvalid()
 {
   activities_valid_ = false;
   instance_powers_.clear();
diff --git a/power/Power.hh b/power/Power.hh
index 83930253..661f6e1f 100644
--- a/power/Power.hh
+++ b/power/Power.hh
@@ -127,8 +127,8 @@ public:
   void reportActivityAnnotation(bool report_unannotated,
                                 bool report_annotated);
   float clockMinPeriod(const Sdc *sdc);
-  void deleteInstanceBefore(const Instance *inst);
-  void deletePinBefore(const Pin *pin);
+  float clockMinPeriod();
+  void powerInvalid();
 
 protected:
   PwrActivity &activity(const Pin *pin);
diff --git a/search/Sta.cc b/search/Sta.cc
index 07bd6c3c..9bf83330 100644
--- a/search/Sta.cc
+++ b/search/Sta.cc
@@ -4428,6 +4428,7 @@ Sta::makeInstanceAfter(const Instance *inst)
         }
       }
       graph_->makeInstanceEdges(inst);
+      power_->powerInvalid();
     }
   }
 }
@@ -4496,6 +4497,8 @@ Sta::replaceEquivCellAfter(const Instance *inst)
       }
     }
     delete pin_iter;
+    clk_skews_->clear();
+    power_->powerInvalid();
   }
 }
 
@@ -4569,7 +4572,6 @@ Sta::replaceCellBefore(const Instance *inst,
       }
     }
     delete pin_iter;
-    clk_skews_->clear();
   }
 }
 
@@ -4640,6 +4642,7 @@ Sta::connectPinAfter(const Pin *pin)
     mode->sim()->connectPinAfter(pin);
   }
   clk_skews_->clear();
+  power_->powerInvalid();
 }
 
 void
@@ -4745,6 +4748,7 @@ Sta::disconnectPinBefore(const Pin *pin)
       }
     }
     clk_skews_->clear();
+    power_->powerInvalid();
   }
 }
 
@@ -4791,6 +4795,8 @@ Sta::deleteNetBefore(const Net *net)
   }
   for (Mode *mode : modes_)
     mode->sdc()->deleteNetBefore(net);
+  clk_skews_->clear();
+  power_->powerInvalid();
 }
 
 void
@@ -4820,7 +4826,8 @@ Sta::deleteLeafInstanceBefore(const Instance *inst)
     mode->sim()->deleteInstanceBefore(inst);
     mode->sdc()->deleteInstanceBefore(inst);
   }
-  power_->deleteInstanceBefore(inst);
+  clk_skews_->clear();
+  power_->powerInvalid();
 }
 
 void