Windmills

Available on both the Facebook and Portal website versions of the game only. However, you must also have your game connected to a Facebook account.
When you start out in the game you can have a maximum of 5 windmills in your camp. These give you energy per hour. The whole system is expandable to an extra 176 energy per hour.
Your neighbors have to place them in your camp. And you in turn place them in their camps.

• The only way to get Windmills is to get them gifted from neighbors as a daily gift.Your neighbors will send them to you.
• You can not use them in your own camp they are for you to place in your neighbor's camps and Mr.Bill(for working on the windmill achievement).
• The number of windmills you have is listed under extra's in your inventory.
• Windmills last for 7 days. Many Facebook groups for the game have a pinned post to request them.

• To place a windmill in your neighbor's camp. Click on the Friends icon. Once in their camp you can see on their Windmill if they need any placed. 0/8 means your neighbor needs 8 new mills. No real need to go visit all your neighbors each day to see if they maybe need one. You will get to visit a part of your neighbors that day to collect the extra energy and a quick look at those windmills should suffice as your part of the deal.

• Windmills are also an Achievement. Each windmill earns you 5 Experience points. You will need to place over 17,000 to complete the achievement. Placing windmills on Mr. Bill's camp counts towards this achievement, he also "sells" his mills every time you refresh his camp so you can place windmills there all day long as many times as you want.

Holland System

Upgrades the maximum number of windmills from 5 to 8.

Cost
level 25	120
level 40	80 8000

Rotor Enhancer

Increases the energy gained from 8 to 22 per hour, per windmill. 15 levels total.

	Energy gain	Level			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