diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4cda5b6e7..b55ccef20 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,7 @@ All notable changes to this project will be documented in this file.
 
 ### Fixed
 - ESP32 ``Upload``, ``Upgrade``, ``WebGetConfig``, ``WebQuery`` and ``WebSend`` random HTTP(S) connection timeout set to 5 sec (commit 542eca3)
+- ESP32 energy monitoring set StartTotalTime regression from v12.3.1.5 (#18385)
 
 ### Removed
 
diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index dc1b36e5c..81b691ee0 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -153,3 +153,4 @@ The latter links can be used for OTA upgrades too like ``OtaUrl https://ota.tasm
 - Refactor energy monitoring reducing stack usage and solve inherent exceptions and watchdogs [#18164](https://github.com/arendst/Tasmota/issues/18164)
 - ESP32 ``Upload``, ``Upgrade``, ``WebGetConfig``, ``WebQuery`` and ``WebSend`` random HTTP(S) connection timeout set to 5 sec (commit 542eca3)
 - ESP32 energy period shows kWh value instead of Wh regression from v12.3.1.5 [#15856](https://github.com/arendst/Tasmota/issues/15856)
+- ESP32 energy monitoring set StartTotalTime regression from v12.3.1.5 [#18385](https://github.com/arendst/Tasmota/issues/18385)
\ No newline at end of file
diff --git a/tasmota/tasmota_support/support_rtc.ino b/tasmota/tasmota_support/support_rtc.ino
index 1c10811fc..84f775a98 100644
--- a/tasmota/tasmota_support/support_rtc.ino
+++ b/tasmota/tasmota_support/support_rtc.ino
@@ -186,9 +186,6 @@ String GetDateAndTime(uint8_t time_type) {
       }
       time = Rtc.restart_time;
       break;
-    case DT_ENERGY:
-      time = Settings->energy_kWhtotal_time;
-      break;
     case DT_BOOTCOUNT:
       time = Settings->bootcount_reset_time;
       break;
diff --git a/tasmota/tasmota_xdrv_driver/xdrv_03_energy.ino b/tasmota/tasmota_xdrv_driver/xdrv_03_energy.ino
index cd3c61770..ebbad0f72 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_03_energy.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_03_energy.ino
@@ -1260,7 +1260,7 @@ void EnergyShow(bool json) {
     bool show_energy_period = (0 == TasmotaGlobal.tele_period);
 
     ResponseAppend_P(PSTR(",\"" D_RSLT_ENERGY "\":{\"" D_JSON_TOTAL_START_TIME "\":\"%s\",\"" D_JSON_TOTAL "\":%s"),
-      GetDateAndTime(DT_ENERGY).c_str(),
+      GetDT(Settings->energy_kWhtotal_time).c_str(),
       EnergyFmt(Energy->total, Settings->flag2.energy_resolution, 2));
 
     if (energy_tariff) {
diff --git a/tasmota/tasmota_xdrv_driver/xdrv_03_esp32_energy.ino b/tasmota/tasmota_xdrv_driver/xdrv_03_esp32_energy.ino
index 0070dbe55..2261c53f2 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_03_esp32_energy.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_03_esp32_energy.ino
@@ -1494,7 +1494,7 @@ void EnergyShow(bool json) {
     bool show_energy_period = (0 == TasmotaGlobal.tele_period);
 
     ResponseAppend_P(PSTR(",\"" D_RSLT_ENERGY "\":{\"" D_JSON_TOTAL_START_TIME "\":\"%s\",\"" D_JSON_TOTAL "\":%s"),
-      GetDateAndTime(DT_ENERGY).c_str(),
+      GetDT(Energy->Settings.energy_kWhtotal_time).c_str(),
       EnergyFmt(Energy->total, Settings->flag2.energy_resolution, 2));
 
     if (energy_tariff) {