Windmills

Only available on the computer versions of the game.
You must also have your game connected to a Facebook account and have at least one neighbor
(FB friends who also play the game).

When you start out in the game you have 5 windmill slots in your camp.
These give you extra energy per hour, if a neighbor has placed windmills in them.
The whole system is expandable to an extra 176 energy per hour. (see Upgrades below)

The only way to get Windmills is to get them gifted from neighbors as a daily gift.
Your neighbors will send them to you as a daily gift and you gift them to all your neighbors once per 2 weeks

You can not use windmills in your own camp.
You place Windmills in your neighbor's camps if needed, your neighbors place windmills in your camp.
Windmills last for 7 days. Many Facebook groups for the game have a pinned post to request them.

Windmills are also an Achievement. Placing each windmill earns you 5 Experience points.
You will need to place over 17,000 Windmills to complete the achievement.
If you want to work on the achievement:
use Mr. Bill's camp endlessly (every time you refresh his camp, you can place more windmills).

To place a windmill in your neighbor's camp, click on the Friends icon and once in their camp you can see on their Windmill if they need any placed.

No real need to go visit all your neighbors each day to see if they maybe need one.
You will get to visit part of your neighbors each day (to collect extra Neighbor Child's Energy)
and a quick look at those windmills should suffice as your part of the deal.

Upgrades are available in the Shop-Extra's

Get 3 more Windmill slots

Cost
level 25	120
level 40	80 8000

Increases the energy gained from 8 to 22 per hour, per windmill.

	Energy gain	Level		or	Level
Level 1	8	30	180		48	11000	90	100
Level 2	9	36	60		54	3,500	30	40
Level 3	10	42	60		60	4,550	45	52
Level 4	11	48	60		66	5,900	68	68
Level 5	12	54	60		72	7,700	100	88
Level 6	13	60	60		78	8,400	120	96
Level 7	14	66	60		84	9,300	145	105
Level 8	15	72	60		90	10,200	175	115
Level 9	16	78	60		96	11,250	210	125
Level 10	17	84	60		102	12,400	250	140
Level 11	18	90	60		108	14,900	280	145
Level 12	19	96	60		114	17,850	305	156
Level 13	20	102	60		120	21,400	335	160
Level 14	21	108	60		126	25,600	370	170
Level 15	22	114	60		132	30,800	410	180
Totals			1020			194,750	2,933	1,740