CastleVille energy is symbolized by a yellow lightning bolt icon. Most actions in CastleVille require use of one energy, If you lack energy, then you will not be able to do much work.
The energy bar constantly displays how much energy you have in play at the time. By placing your cursor over the energy bar you will see a display of the maximum energy you can have and of how much time is left untill you get more energy. The energy timer is also present under the Energy bar - when it is not already at maximum. When you have three energy, or less, a small banner will appear under the energy bar with the words "Add More Energy".
Getting Energy :
There are six ways to obtain Energy:
1. Energy By Time: For every 5 minutes of time, you receive one unit of energy.
2. Energy Potions: The market sells five types of energy potions. Higher amounts cost more.
3. Energy From Friends: The free gifts link (above the game on the left). and window of friends, allow you to send one free energy, which then allows you to receive it in return. Each friend can give you one gift every day.
4. Helping Neighbors: After helping a neighbor's kingdom (five actions in each kingdom) each day, you may receive an energy or two.
5. Leveling Up: Leveling up gives you more energy, which can be count as extra energy. This will also raise your maximum energy limit.
6. Working The Land: By doing actions you might get a free energy. This is a totally random mechanism.
( Source : http://castlevillezynga.wikia.com/wiki/Energy )
7 .Or Click these links below :P give 10 energy each link.
When you face :
1. Sorry, all rewards have been claimed
2. Whoa, friend! You've reached the collection limit for now. Try again later.
Still Clicking all these links then check your inventory, before you start clicking please read the date of this post because energy links only valid for 2 - 3 days.
For tricks you can learn by read the comments here
Read more: http://www.xhapire.com/2012/01/castleville-free-energy-jan-12-2012.html#ixzz1jA6hAB8Q
