From f6df06c4250aa51e9d04ed740e04733d61ce10c9 Mon Sep 17 00:00:00 2001
From: Yifan Lu <pplyfpp@gmail.com>
Date: Tue, 28 Apr 2026 15:45:47 +0800
Subject: [PATCH] Fix negative maximum contingency in spinning reserves

---
 switch_model/balancing/operating_reserves/spinning_reserves.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/switch_model/balancing/operating_reserves/spinning_reserves.py b/switch_model/balancing/operating_reserves/spinning_reserves.py
index d5f199c4..d4a4b33d 100644
--- a/switch_model/balancing/operating_reserves/spinning_reserves.py
+++ b/switch_model/balancing/operating_reserves/spinning_reserves.py
@@ -551,6 +551,7 @@ def define_dynamic_components(m):
     """
     m.MaximumContingency = Var(
         m.BALANCING_AREA_TIMEPOINTS,
+        within=NonNegativeReals,
         doc=(
             "Maximum of the registered Spinning_Reserve_Contingencies, after "
             "multiplying by contingency_safety_factor."