diff --git a/app/igneum-app/src/engine.rs b/app/igneum-app/src/engine.rs
index bd690bdfa..d3bf7a823 100644
--- a/app/igneum-app/src/engine.rs
+++ b/app/igneum-app/src/engine.rs
@@ -2295,7 +2295,9 @@ impl Engine {
         };
         // NVIDIA control: this process is elevated (direct), or Power control is on so the one-prompt helper may run.
         // The --sweep job alone never counts: it must not raise a prompt on a PC with nobody there (5 October 2026).
-        let power_control = probe.direct || self.shared.settings.lock().unwrap().power_control;
+        // a registered Igneum Power Helper task (src/powertask.rs) is permission too: it sets limits with no prompt,
+        // so an unelevated measurement engine (Power control forced off) still controls NVIDIA through it
+        let power_control = probe.direct || self.shared.settings.lock().unwrap().power_control || (cfg!(windows) && self.power_task_registered());
         // AMD's power limit is a percent offset from the default (ADLX): the plan's watts scale becomes a percent
         // scale (default 100, floor 100 + plimit_min, ceiling 100 + plimit_max), tune_apply sends pct - 100
         let limits = if c.vendor == "amd" && probe.direct && probe.plimit_max >= probe.plimit_min && probe.plimit_min > -100.0 {
@@ -2388,7 +2390,8 @@ impl Engine {
 
     /// The elevated helper (src/sweep.rs helper_script_*): one administrator prompt; it polls <app>/sweep/cmd.txt.
     fn sweep_helper_start(&mut self, c: &CardState) -> Result<(), String> {
-        if !self.shared.settings.lock().unwrap().power_control {
+        let task = cfg!(windows) && self.power_task_registered();
+        if !task && !self.shared.settings.lock().unwrap().power_control {
             return Err("Power control is off in Settings".into());
         }
         let dir = self.sweep_dir();