I have discovered that Steem Power grows by itself, although I don't know at what rate. This is most easily seen on this account which has a huge amount of SP, which I believe belongs to one of the founders:
https://steemit.com/@dantheman/transfers
If you refresh the page, you will notice that his Steem power increases with each refresh, without him collecting his rewards.
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Hmmm....
My calculations show an interest rate of around 1.95% per year, based on a 10 minute period of gains of this account.
Maybe this will help shed some light into the matter: https://steemit.com/steemit/@trafalgar/a-problem-in-the-economics-of-steemit
But using it to vote doesn't reduce that, I believe.