diff --git a/.changeset/energyplan-0-5-0.md b/.changeset/energyplan-0-5-0.md
new file mode 100644
index 000000000..abdfe50e9
--- /dev/null
+++ b/.changeset/energyplan-0-5-0.md
@@ -0,0 +1,5 @@
+---
+"ftw": patch
+---
+
+Update the bundled Energyplan planner to 0.5.0. On a small box such as a Raspberry Pi 4, plans with a car get better within the 0.5 s budget: time that the solver's LP phases cannot use now goes to improving the plan Core gets. A car that cannot charge is planned with the exact battery method, and a car a fraction of a watt-hour short of its goal no longer restarts the charger. The planner keeps a valid plan when its solver fails, reports `gap_satisfied` when it meets Core's gap, fixes a wrong demand-charge sign for the running hour, and closes two ways it could report an unproven optimum. Core still validates every plan.
diff --git a/go/internal/mpc/energyplan_fault_test.go b/go/internal/mpc/energyplan_fault_test.go
index 2fb34ef77..c5d689218 100644
--- a/go/internal/mpc/energyplan_fault_test.go
+++ b/go/internal/mpc/energyplan_fault_test.go
@@ -57,7 +57,7 @@ func TestNativeEnergyplanEVRecoveryFallbackFaults(t *testing.T) {
 				t.Cleanup(func() { _ = external.Close() })
 				wrapper := &EnergyplanOptimizer{ExternalOptimizer: external}
 				health, err := wrapper.Health(context.Background())
-				if err != nil || health.Version != "0.4.10" {
+				if err != nil || health.Version != "0.5.0" {
 					t.Fatalf("bundle health=%+v err=%v", health, err)
 				}
 				svc := shadowTestService(t)
diff --git a/go/internal/mpc/energyplan_test.go b/go/internal/mpc/energyplan_test.go
index 3c51ccbed..841f1e6db 100644
--- a/go/internal/mpc/energyplan_test.go
+++ b/go/internal/mpc/energyplan_test.go
@@ -95,7 +95,7 @@ func TestNativeEnergyplanDownsideAndAsyncShadow(t *testing.T) {
 	svc := shadowTestService(t)
 	svc.Optimizer = o
 	info, err := svc.Optimizer.(*EnergyplanOptimizer).Health(context.Background())
-	if err != nil || info.Name != "ftw-solver" || info.Version != "0.4.10" {
+	if err != nil || info.Name != "ftw-solver" || info.Version != "0.5.0" {
 		t.Fatalf("bundled worker health: %+v %v", info, err)
 	}
 	start := time.Now().UTC().Truncate(time.Hour)
diff --git a/optimizer/native/README.md b/optimizer/native/README.md
index 2a1bd9b94..6619ec34a 100644
--- a/optimizer/native/README.md
+++ b/optimizer/native/README.md
@@ -8,7 +8,7 @@ The [Energyplan contract](../../docs/energyplan-contract.md) defines the shared
 planning and forecast boundary, result meanings, units and failure rules.
 Core owns it; Energyplan keeps an identical copy.
 
-Energyplan 0.4.10 uses the Home Use Binary License in `bundle/LICENSE.txt`. It
+Energyplan 0.5.0 uses the Home Use Binary License in `bundle/LICENSE.txt`. It
 permits private household use with FTW and free noncommercial redistribution
 for that use. Commercial use, OEM bundles, paid installation and services need
 a separate written license from Sourceful Labs AB. FTW's AGPL code has a
diff --git a/optimizer/native/bundle/ftw-solver-darwin-arm64 b/optimizer/native/bundle/ftw-solver-darwin-arm64
index a9d718a49..74f1ae6d7 100755
Binary files a/optimizer/native/bundle/ftw-solver-darwin-arm64 and b/optimizer/native/bundle/ftw-solver-darwin-arm64 differ
diff --git a/optimizer/native/bundle/ftw-solver-linux-amd64 b/optimizer/native/bundle/ftw-solver-linux-amd64
index f6853760d..3a3b70253 100755
Binary files a/optimizer/native/bundle/ftw-solver-linux-amd64 and b/optimizer/native/bundle/ftw-solver-linux-amd64 differ
diff --git a/optimizer/native/bundle/ftw-solver-linux-arm64 b/optimizer/native/bundle/ftw-solver-linux-arm64
index 68f1bea0a..e6df0f0db 100755
Binary files a/optimizer/native/bundle/ftw-solver-linux-arm64 and b/optimizer/native/bundle/ftw-solver-linux-arm64 differ
diff --git a/optimizer/native/bundle/manifest.json b/optimizer/native/bundle/manifest.json
index ff77d9427..8f5a90f7f 100644
--- a/optimizer/native/bundle/manifest.json
+++ b/optimizer/native/bundle/manifest.json
@@ -1,9 +1,9 @@
 {
   "schema_version": 1,
   "product": "energyplan",
-  "version": "0.4.10",
+  "version": "0.5.0",
   "source_repository": "srcfl/energyplan",
-  "source_commit": "2c8c777620036b6e5be8e2b17f79a0e3733e1100",
+  "source_commit": "4ad5804a9bbaabe3ddff0a64fff1009ed359f580",
   "rustc": "rustc 1.95.0 (59807616e 2026-04-14)",
   "protocol_version": 1,
   "forecast_protocol_version": 1,
@@ -39,16 +39,16 @@
       "bytes": 15377
     },
     "ftw-solver-darwin-arm64": {
-      "sha256": "927d82bba7bfa935c0165cf396a0e9abbee7df4d784567b0405b664dd76126aa",
-      "bytes": 1356016
+      "sha256": "be7bdb3fb4dd0dd5d941c483bc5d29e4395fd0a09d10d9dbd86093da23d2188d",
+      "bytes": 1422560
     },
     "ftw-solver-linux-amd64": {
-      "sha256": "62fec8f22bbb3cea94d644b4cf8a102c6d33c0f76e2092f5dfbdf9f2b8b83566",
-      "bytes": 1751368
+      "sha256": "63db6fdb40db1d8e2c992ff04393488ba8d19c9d1e124367b53dad73e045cb6c",
+      "bytes": 1819336
     },
     "ftw-solver-linux-arm64": {
-      "sha256": "92033f003014b2f56b104c2601fa45f91d972c5179880d45847c03190a92b6d6",
-      "bytes": 1405744
+      "sha256": "1294944402313bb42b504fad8b1687015415a3cf6f27c45761b6cffd40e98e0b",
+      "bytes": 1457536
     },
     "rust-runtime/COPYRIGHT-library.html": {
       "sha256": "90567e2718bf7fd65a71a3a43c5596488e80e5f51ed02bfea6fec54458b5f3d1",