Port some power sprites from Bay

code/modules/power/cable.dm

@@ -582,9 +582,12 @@ obj/structure/cable/proc/cableColor(var/colorC)
 	else if(amount == 2)
 		icon_state = "coil2"
 		name = "cable piece"
-	else
+	else if(amount > 2 && amount != max_amount)
 		icon_state = "coil"
-		name = "cable coil"
+		name = initial(name)
+	else
+		icon_state = "coil-max"
+		name = initial(name)
 
 /obj/item/stack/cable_coil/proc/set_cable_color(var/selected_color, var/user)
 	if(!selected_color)

code/modules/power/generator.dm

@@ -3,7 +3,7 @@ GLOBAL_LIST_EMPTY(all_turbines)
 /obj/machinery/power/generator
 	name = "thermoelectric generator"
 	desc = "It's a high efficiency thermoelectric generator."
-	icon_state = "teg"
+	icon_state = "teg-unassembled"
 	density = 1
 	anchored = 0
 
@@ -68,13 +68,26 @@ GLOBAL_LIST_EMPTY(all_turbines)
 				circ2 = null
 
 /obj/machinery/power/generator/proc/updateicon()
-	if(stat & (NOPOWER|BROKEN))
-		overlays.Cut()
+	icon_state = anchored ? "teg-assembled" : "teg-unassembled"
+	cut_overlays()
+	if (circ1)
+		circ1.temperature_overlay = null
+	if (circ2)
+		circ2.temperature_overlay = null
+	if (stat & (NOPOWER|BROKEN))
+		return 1
 	else
-		overlays.Cut()
-
-		if(lastgenlev != 0)
-			overlays += image('icons/obj/power.dmi', "teg-op[lastgenlev]")
+		if (lastgenlev != 0)
+			add_overlay("teg-op[lastgenlev]")
+			if (circ1 && circ2)
+				var/extreme = (lastgenlev > 9) ? "ex" : ""
+				if (circ1.last_temperature < circ2.last_temperature)
+					circ1.temperature_overlay = "circ-[extreme]cold"
+					circ2.temperature_overlay = "circ-[extreme]hot"
+				else
+					circ1.temperature_overlay = "circ-[extreme]hot"
+					circ2.temperature_overlay = "circ-[extreme]cold"
+		return 1
 
 /obj/machinery/power/generator/process()
 	if(!circ1 || !circ2 || !anchored || stat & (BROKEN|NOPOWER))