diff --git a/src/reactor_sim/turbine.py b/src/reactor_sim/turbine.py
index 278690c..7837ec4 100644
--- a/src/reactor_sim/turbine.py
+++ b/src/reactor_sim/turbine.py
@@ -35,7 +35,8 @@ class Turbine:
         steam_power_mw: float = 0.0,
         dt: float = 1.0,
     ) -> None:
-        if steam_power_mw <= 0.0 and loop.steam_quality <= 0.01:
+        effective_mass_flow = loop.mass_flow_rate * max(0.0, loop.steam_quality)
+        if steam_power_mw <= 0.0 and (loop.steam_quality <= 0.01 or effective_mass_flow <= 10.0):
             # No steam available; turbine should idle.
             state.shaft_power_mw = 0.0
             state.electrical_output_mw = 0.0
@@ -46,8 +47,9 @@ class Turbine:
             return
 
         enthalpy = 2_700.0 + loop.steam_quality * 600.0
-        mass_flow = loop.mass_flow_rate * 0.6
-        available_power = max(steam_power_mw, (enthalpy * mass_flow / 1_000.0) / 1_000.0)
+        mass_flow = effective_mass_flow * 0.6
+        computed_power = (enthalpy * mass_flow / 1_000.0) / 1_000.0
+        available_power = steam_power_mw if steam_power_mw > 0 else computed_power
         shaft_power_mw = available_power * self.mechanical_efficiency
         electrical = shaft_power_mw * self.generator_efficiency
         if electrical > self.rated_output_mw: