diff --git a/models/techage_rotor.b3d b/models/techage_rotor.b3d
new file mode 100644
index 0000000..afd8f0c
Binary files /dev/null and b/models/techage_rotor.b3d differ
diff --git a/power/protection.lua b/power/protection.lua
new file mode 100644
index 0000000..5fe7cf3
--- /dev/null
+++ b/power/protection.lua
@@ -0,0 +1,70 @@
+--[[
+
+	TechAge
+	=======
+
+	Copyright (C) 2019 Joachim Stolberg
+
+	GPL v3
+	See LICENSE.txt for more information
+	
+	TA3/TA4 Power line Protection
+]]--
+
+local M = minetest.get_meta
+local S = techage.S
+
+local RANGE = 8
+
+local IsNodeUnderObservation = {}
+
+-- Register all nodes, which should be protected by the "techage:power_pole"
+function techage.register_powerline_node(name)
+		IsNodeUnderObservation[name] = true
+end
+
+local function powerpole_found(pos, name, range)
+	local pos1 = {x=pos.x-range, y=pos.y-range, z=pos.z-range}
+	local pos2 = {x=pos.x+range, y=pos.y+range, z=pos.z+range}
+	for _,npos in ipairs(minetest.find_nodes_in_area(pos1, pos2, {"techage:power_pole", "techage:power_pole2"})) do
+		if minetest.get_meta(npos):get_string("owner") ~= name then
+			return true
+		end
+	end
+	return false
+end
+
+local function is_protected(pos, name, range)
+	if minetest.check_player_privs(name, "powerline")
+			or not powerpole_found(pos, name, range) then
+		return false
+	end
+	return true
+end
+
+function techage.is_protected(pos, name)
+	return is_protected(pos, name, RANGE+3)
+end
+
+
+local old_is_protected = minetest.is_protected
+
+function minetest.is_protected(pos, name)
+	local node = minetest.get_node(pos)
+	if IsNodeUnderObservation[node.name] and is_protected(pos, name, RANGE) then
+        return true
+    end
+	return old_is_protected(pos, name)
+end
+
+minetest.register_privilege("powerline", {
+	description = S("Allow to dig/place Techage power lines nearby power poles"),
+	give_to_singleplayer = false,
+	give_to_admin = true,
+})
+
+techage.register_powerline_node("techage:power_line")
+techage.register_powerline_node("techage:power_lineS")
+techage.register_powerline_node("techage:power_lineA")
+techage.register_powerline_node("techage:power_pole3")
+
diff --git a/textures/techage_rotor.png b/textures/techage_rotor.png
new file mode 100644
index 0000000..20e2f0d
Binary files /dev/null and b/textures/techage_rotor.png differ
diff --git a/textures/techage_rotor_blades.png b/textures/techage_rotor_blades.png
new file mode 100644
index 0000000..d2895f8
Binary files /dev/null and b/textures/techage_rotor_blades.png differ
diff --git a/textures/techage_rotor_top.png b/textures/techage_rotor_top.png
new file mode 100644
index 0000000..ae1b34d
Binary files /dev/null and b/textures/techage_rotor_top.png differ
diff --git a/textures/techage_wind_turbine_inv.png b/textures/techage_wind_turbine_inv.png
new file mode 100644
index 0000000..52202df
Binary files /dev/null and b/textures/techage_wind_turbine_inv.png differ
diff --git a/wind_turbine/rotor.lua b/wind_turbine/rotor.lua
new file mode 100644
index 0000000..a0c2fe7
--- /dev/null
+++ b/wind_turbine/rotor.lua
@@ -0,0 +1,238 @@
+--[[
+
+	TechAge
+	=======
+
+	Copyright (C) 2019 DS-Minetest, Joachim Stolberg
+
+	GPL v3
+	See LICENSE.txt for more information
+
+	TA4 Power Wind Turbine Rotor
+	
+	Code by Joachim Stolberg, derived from DS-Minetest [1]
+	Rotor model and texture designed by DS-Minetest [1] (CC-0)
+	
+	[1] https://github.com/DS-Minetest/wind_turbine
+	
+]]--
+
+-- for lazy programmers
+local M = minetest.get_meta
+local S = techage.S
+
+local CYCLE_TIME = 2
+local PWR_PERF = 80
+
+local Cable = techage.ElectricCable
+local power = techage.power
+
+local Rotors = {}
+
+local Face2Dir = {[0]=
+	{x=0,  y=0,  z=1},
+	{x=1,  y=0,  z=0},
+	{x=0,  y=0, z=-1},
+	{x=-1, y=0,  z=0},
+	{x=0,  y=-1, z=0},
+	{x=0,  y=1,  z=0}
+}
+
+local function pos_and_yaw(pos, param2)
+	local dir = Face2Dir[param2]
+	local yaw = minetest.dir_to_yaw(dir)
+	dir = vector.multiply(dir, 1.3)
+	pos = vector.add(pos, dir)
+	return pos, {x=0, y=yaw, z=0}
+end
+
+local function add_rotor(pos, player_name)
+	local pos1 = {x=pos.x-14, y=pos.y-10, z=pos.z-14}
+	local pos2 = {x=pos.x+14, y=pos.y+10, z=pos.z+14}
+	local num_node = 29*29*21 - 12
+	local num = #minetest.find_nodes_in_area(pos1, pos2, {"air", "ignore"})
+	if num < num_node then
+		if player_name then
+			minetest.chat_send_player(player_name, "[TA4 Wind Turbine] Not enough space!")
+		end
+		return
+	end
+	
+	local data = minetest.get_biome_data({x=pos.x, y=0, z=pos.z})
+	if not techage.OceanIdTbl[data.biome] then
+		if player_name then
+			minetest.chat_send_player(player_name, "[TA4 Wind Turbine]  Wrong place for wind turbines!")
+		end
+		return
+	end
+	
+	if pos.y < 12 or pos.y > 20 then
+		if player_name then
+			minetest.chat_send_player(player_name, "[TA4 Wind Turbine] No wind at this altitude!")
+		end
+		return
+	end
+	
+	local hash = minetest.hash_node_position(pos)
+	if not Rotors[hash] then
+		local node = minetest.get_node(pos)
+		local npos, yaw = pos_and_yaw(pos, node.param2)
+		local obj = minetest.add_entity(npos, "techage:rotor_ent")
+		obj:set_animation({x = 0, y = 119}, 0, 0, true)
+		obj:set_rotation(yaw)
+		Rotors[hash] = obj
+	end
+end	
+
+local function start_rotor(pos, mem)
+	mem.providing = true
+	power.generator_start(pos, mem, PWR_PERF)
+	local hash = minetest.hash_node_position(pos)
+	if Rotors[hash] then
+		Rotors[hash]:set_animation_frame_speed(50)
+	end
+end
+
+local function stop_rotor(pos, mem)
+	mem.providing = false
+	power.generator_stop(pos, mem)
+	local hash = minetest.hash_node_position(pos)
+	if Rotors[hash] then
+		Rotors[hash]:set_animation_frame_speed(0)
+	end
+end
+
+local function node_timer(pos, elapsed)
+	local mem = tubelib2.get_mem(pos)
+	
+	print("node_timer", mem.running, mem.providing)
+	if not mem.running then
+		return false
+	end
+	
+	local time = minetest.get_timeofday() or 0
+	if (time >= 5.00/24.00 and time <= 9.00/24.00) or (time >= 17.00/24.00 and time <= 21.00/24.00) then
+		if not mem.providing then
+			start_rotor(pos, mem)
+		end
+	else
+		if mem.providing then
+			stop_rotor(pos, mem)
+		end
+	end
+	if mem.providing then
+		power.generator_alive(pos, mem)
+	end
+	return true
+end
+
+minetest.register_node("techage:ta4_wind_turbine", {
+	description = S("TA4 Wind Turbine"),
+	inventory_image = "techage_wind_turbine_inv.png",
+	tiles = {
+		-- up, down, right, left, back, front
+		"techage_rotor_top.png",
+		"techage_rotor_top.png",
+		"techage_rotor.png",
+	},
+	
+	on_construct = tubelib2.init_mem,
+	
+	after_place_node = function(pos, placer)
+		local meta = M(pos)
+		-- secondary 'after_place_node', called by power. Don't use tubelib2.init_mem(pos)!!!
+		local mem = tubelib2.get_mem(pos)
+		local own_num = techage.add_node(pos, "techage:ta4_wind_turbine")
+		meta:set_string("node_number", own_num)
+		meta:set_string("owner", placer:get_player_name())
+		meta:set_string("infotext", S("TA4 Wind Turbine").." "..own_num)
+		mem.providing = false
+		mem.running = true
+		add_rotor(pos, placer:get_player_name())
+		minetest.get_node_timer(pos):start(CYCLE_TIME)
+	end,
+	
+	on_timer = node_timer,
+	
+	after_dig_node = function(pos)
+		local hash = minetest.hash_node_position(pos)
+		if Rotors[hash] and Rotors[hash]:get_luaentity() then
+			Rotors[hash]:remove()
+		end
+		Rotors[hash] = nil
+		techage.remove_node(pos)
+		tubelib2.del_mem(pos)
+	end,
+	
+	paramtype2 = "facedir",
+	groups = {cracky=2, crumbly=2, choppy=2},
+	is_ground_content = false,
+	sounds = default.node_sound_metal_defaults(),
+})
+
+
+minetest.register_node("techage:ta4_wind_turbine_nacelle", {
+	description = S("TA4 Wind Turbine Nacelle"),
+	tiles = {
+		-- up, down, right, left, back, front
+		"techage_rotor_top.png",
+		"techage_rotor_top.png",
+		"techage_rotor.png",
+	},
+	paramtype2 = "facedir",
+	groups = {cracky=2, crumbly=2, choppy=2},
+	is_ground_content = false,
+	sounds = default.node_sound_metal_defaults(),
+	drop = "",
+})
+
+minetest.register_entity("techage:rotor_ent", {initial_properties = {
+	physical = false,
+	pointable = false,
+	visual = "mesh",
+	visual_size = {x = 1.5, y = 1.5, z = 1.5},
+	mesh = "techage_rotor.b3d",
+	textures = {"techage_rotor_blades.png"},
+	static_save = false,
+}})
+
+techage.power.register_node({"techage:ta4_wind_turbine"}, {
+	power_network  = Cable,
+	conn_sides = {"D"},
+})
+
+techage.register_node({"techage:ta4_wind_turbine"}, {	
+	on_recv_message = function(pos, src, topic, payload)
+		local mem = tubelib2.get_mem(pos)
+		print("on_recv_message", topic)
+		if topic == "state" then
+			if mem.running and mem.providing then
+				return "running"
+			else
+				return "stopped"
+			end
+		elseif topic == "on" then
+			mem.running = true
+		elseif topic == "off" then
+			mem.running = false
+		else
+			return "unsupported"
+		end
+	end,
+	on_node_load = function(pos)
+		add_rotor(pos)
+		local mem = tubelib2.get_mem(pos)
+		mem.providing = false  -- to force the rotor start
+		minetest.get_node_timer(pos):start(CYCLE_TIME)
+	end,
+})
+
+
+--minetest.register_craft({
+--	output = "techage:ta4_wind_turbine",
+--	recipe = {
+--		{"", "techage:ta4_wlanchip", ""},
+--		{"techage:ta4_silicon_wafer", "techage:ta4_silicon_wafer", "techage:ta4_silicon_wafer"},
+--		{"default:tin_ingot", "techage:iron_ingot", "default:copper_ingot"},
+--	},
+--})