diff --git a/debian/control b/debian/control
index af1073f..465f302 100644
--- a/debian/control
+++ b/debian/control
@@ -10,6 +10,7 @@ Build-Depends: debhelper,
                libnymea-dev,
                nymea-dev-tools:native,
                libnymea-modbus-dev,
+               libnymea-sunspec-dev,
                qt6-base-dev,
                qt6-base-dev-tools,
                qt6-serialport-dev,
@@ -53,3 +54,25 @@ Description: PowerSync integration plugin for V2C Trydan EV charger (Modbus TCP)
  system.  Implements the evcharger interface: charge enable/disable, current
  setpoint, plugged-in / charging state, house and solar power telemetry.
  Status: Partial — not yet validated on real hardware.
+
+Package: nymea-plugin-sunspec-etm01
+Architecture: any
+Section: libs
+Depends: ${shlibs:Depends},
+         ${misc:Depends},
+Conflicts: nymea-plugin-sunspec
+Replaces: nymea-plugin-sunspec
+Provides: nymea-plugin-sunspec
+Description: SunSpec Modbus devices, ETM fork with Fronius support - vendored
+ nymea integration plugin for SunSpec compatible solar inverters, meters and
+ storage over Modbus TCP.  ETM fork of the upstream plugin, adding the Fronius
+ vendor: a GEN24 answers for the inverter and for its Smart Meter on separate
+ unit IDs behind one host and port, so one connection thing carries two.
+ .
+ Ships the same plugin file and the same pluginId as the upstream
+ nymea-plugin-sunspec, which it therefore conflicts with and replaces.  The
+ -etm01 suffix marks the fork; the name goes back to nymea-plugin-sunspec if
+ the Fronius vendor is ever merged upstream.
+ .
+ Status: Partial - verified against a SunSpec simulator only, never on a real
+ inverter.
diff --git a/debian/nymea-plugin-sunspec-etm01.install b/debian/nymea-plugin-sunspec-etm01.install
new file mode 100644
index 0000000..40c427d
--- /dev/null
+++ b/debian/nymea-plugin-sunspec-etm01.install
@@ -0,0 +1 @@
+usr/lib/*/nymea/plugins/libnymea_integrationpluginsunspec.so