diff --git a/krebs/1systems/puyak/config.nix b/krebs/1systems/puyak/config.nix
index 033cb94d1..931ebe70b 100644
--- a/krebs/1systems/puyak/config.nix
+++ b/krebs/1systems/puyak/config.nix
@@ -46,10 +46,8 @@
     # light.shack web-ui
     <stockholm/krebs/2configs/shack/light.shack.nix> #light.shack
 
-    # powerraw usb serial to mqtt and raw socket
-    <stockholm/krebs/2configs/shack/powerraw.nix> # powerraw.shack standby.shack
-    # send power stats to s3
-    <stockholm/krebs/2configs/shack/s3-power.nix> # powerraw.shack must be available
+    # fetch the u300 power stats
+    <stockholm/krebs/2configs/shack/power/u300-power.nix>
 
 
     { # do not log to /var/spool/log
diff --git a/krebs/2configs/shack/grafana.nix b/krebs/2configs/shack/grafana.nix
index adf0a4bc3..f42f1c4af 100644
--- a/krebs/2configs/shack/grafana.nix
+++ b/krebs/2configs/shack/grafana.nix
@@ -4,7 +4,18 @@ in {
 
   networking.firewall.allowedTCPPorts = [ port ]; # legacy
   services.nginx.virtualHosts."grafana.shack" = {
-    locations."/".proxyPass = "http://localhost:${toString port}";
+    locations."/" = {
+      proxyPass = "http://localhost:${toString port}";
+      extraConfig =''
+          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+          proxy_set_header Host             $host;
+          proxy_set_header X-Real-IP        $remote_addr;
+          proxy_http_version 1.1;
+          proxy_set_header Upgrade $http_upgrade;
+          proxy_set_header Connection "upgrade";
+      '';
+
+    };
   };
   services.grafana = {
     enable = true;
diff --git a/krebs/2configs/shack/influx.nix b/krebs/2configs/shack/influx.nix
index 6d090323d..efc88f51d 100644
--- a/krebs/2configs/shack/influx.nix
+++ b/krebs/2configs/shack/influx.nix
@@ -15,6 +15,16 @@ in
     '';
     locations."/" = {
       proxyPass = "http://localhost:${toString port}/";
+      extraConfig = ''
+          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+          proxy_set_header Host             $host;
+          proxy_set_header X-Real-IP        $remote_addr;
+          proxy_http_version 1.1;
+          proxy_set_header Upgrade $http_upgrade;
+          proxy_set_header Connection "upgrade";
+
+          proxy_buffering off;
+      '';
     };
   };
   nixpkgs.overlays = [ 
diff --git a/krebs/2configs/shack/power/u300-power.nix b/krebs/2configs/shack/power/u300-power.nix
new file mode 100644
index 000000000..66e54169a
--- /dev/null
+++ b/krebs/2configs/shack/power/u300-power.nix
@@ -0,0 +1,29 @@
+{ pkgs, ... }:
+let
+  src = pkgs.fetchFromGitHub {
+    repo = "shackstrom";
+    owner = "samularity";
+    rev = "adfbdc7d12000fbc9fd9367c8ef0a53b7d0a9fad";
+    hash = "sha256-77vSX2+1XXaBVgLka+tSEK/XYZASEk9iq+uEuO1aOUQ=";
+  };
+  pkg = pkgs.writers.writePython3 "test_python3" {
+    libraries = [ pkgs.python3Packages.requests pkgs.python3Packages.paho-mqtt  ];
+  } (builtins.readFile "${src}/shackstrom.py");
+in
+{
+    systemd.services = {
+      u300-power = {
+        enable = true;
+        environment = { 
+          DATA_URL = "http://10.42.20.255/csv.html";
+          BROKER = "mqtt.shack";
+        };
+        serviceConfig = {
+          Restart = "always";
+          ExecStart = pkg;
+          RestartSec = "15s";
+        };
+        wantedBy = [ "multi-user.target" ];
+      };
+    };
+}