turtle.trasnferFuel(<side>,<quantity>)

A function to transfuse RAW fuel from one turtle to another directly adjacent.

This could be done through peripheral calls example

peripheral.call("left","pushFuel",10) – transfers power to a turtle

and

peripheral.call("left","pullFuel",10) – removes power from a turtle

both would return true if the operation completed and false if it didn't

And possibly

turtle.lockFuel(true/false) – stops other turtle taking or giving power
turtle.lockInventory(true/false) – stops items being takes or given

[EDIT]
correction's made turtles store fuel no Power.

What power?

Fuel power I am guessing, so you can make one turtle hold all of the coal and then give energy to the other turtles

turtles store fuel some how. That is what I have called "Power" obviously I have a misunderstanding of something.