diff --git a/pkgs/development/python-modules/iotawattpy/default.nix b/pkgs/development/python-modules/iotawattpy/default.nix
new file mode 100644
index 000000000000..7eca486eea0b
--- /dev/null
+++ b/pkgs/development/python-modules/iotawattpy/default.nix
@@ -0,0 +1,36 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, httpx
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "iotawattpy";
+  version = "0.1.0";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.8";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1pyxm87lvd6zy0rx7r9jivk2li267r3xr0b9p6vf0v0vp9fmgsw3";
+  };
+
+  propagatedBuildInputs = [
+    httpx
+  ];
+
+  # Project doesn't tag releases or ship the tests with PyPI
+  # https://github.com/gtdiehl/iotawattpy/issues/14
+  doCheck = false;
+
+  pythonImportsCheck = [ "iotawattpy" ];
+
+  meta = with lib; {
+    description = "Python interface for the IoTaWatt device";
+    homepage = "https://github.com/gtdiehl/iotawattpy";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ fab ];
+  };
+}
diff --git a/pkgs/servers/home-assistant/component-packages.nix b/pkgs/servers/home-assistant/component-packages.nix
index b1363880f9f8..67c550d6f557 100644
--- a/pkgs/servers/home-assistant/component-packages.nix
+++ b/pkgs/servers/home-assistant/component-packages.nix
@@ -411,7 +411,7 @@
     "intesishome" = ps: with ps; [ pyintesishome ];
     "ios" = ps: with ps; [ aiohttp-cors ifaddr zeroconf ];
     "iota" = ps: with ps; [ ]; # missing inputs: pyota
-    "iotawatt" = ps: with ps; [ ]; # missing inputs: iotawattpy
+    "iotawatt" = ps: with ps; [ iotawattpy ];
     "iperf3" = ps: with ps; [ ]; # missing inputs: iperf3
     "ipma" = ps: with ps; [ pyipma ];
     "ipp" = ps: with ps; [ pyipp ];
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 1b15dbf000f8..f202b49c953e 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -3680,6 +3680,8 @@ in {
 
   iocapture = callPackage ../development/python-modules/iocapture { };
 
+  iotawattpy = callPackage ../development/python-modules/iotawattpy { };
+
   iowait = callPackage ../development/python-modules/iowait { };
 
   ipaddress = callPackage ../development/python-modules/ipaddress { };