diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/capability/Ext.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/capability/Ext.kt
index 1f2950ed1..124338e45 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/capability/Ext.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/capability/Ext.kt
@@ -351,7 +351,7 @@ fun moveBetweenSlots(source: IItemHandler, sourceSlot: Int, destination: IItemHa
 }
 
 @Suppress("name_shadowing")
-fun moveEnergy(source: IEnergyStorage, destination: IEnergyStorage, amount: Decimal = Decimal.LONG_MAX_VALUE, simulate: Boolean, ignoreFlowRestrictions: Boolean = false): Decimal {
+fun moveEnergy(source: IEnergyStorage, destination: IEnergyStorage, amount: Decimal = Decimal.LONG_MAX_VALUE.coerceAtLeast(source.energyStoredMattery), simulate: Boolean, ignoreFlowRestrictions: Boolean = false): Decimal {
 	val extracted = if (ignoreFlowRestrictions && source is IMatteryEnergyStorage) source.extractEnergy(amount, true) else source.extractEnergy(amount, true)
 
 	if (extracted.isPositive) {