Originally the text was: 

> 
> Energy is delivered to the charging system similar to that during
>  normal power operation.
> 
> 
> 

I came up with the following solution:

> 
> Energy is delivered to the charging system in a way that is similar to
>  that of normal power operation.
> 
> 
> 

But it still seems awkward and clunky so please let me know if it's acceptable and provide some suggestions for alternative ways to word this phrase.