I hit a 1hbh and it is a bullet. First you need to check your technique on your 1hbh. I reccommend you watch what federer and justin henin are doing. Federers is more eastern justin more semi/western to western. Justins is more stable arm structure behind the racquet and she is one small framed girl hitting better backhands than most of us.
To generate the power there are a few ways;
1) Make sure your strung with good power strings and at a slightly lower tension.
2) Make sure your stroke mechanics are in order. The 1hbh usually is performed in closed stance or semi-closed so ensure a good takeback.
3) Force = mass x acceleration so make sure your racquet has some mass. Also make sure you switch from takeback to contract phase efficiently so you have both room to generate momentemum and accelleration before making contact with the ball infront.
4) Decide the angle attack on hitting the ball as well as your contact point of your racquet's sweetspot in relation to the ball.
5) Go out and hit it with a ball machine for a couple of hours. Hit all using roughly the same medium level force and you will see sometimes how you hit the ball in relation to your sweetspot also contributes to the dynamite you put in the ball.
Watch the pros who do it good. Gaston Gaudio has a nice backhand, federer has nice one too but he gets a bit sloppy on it now and again. Justin's is nice.
Here is a link you can look at to see a nice backhand which is 1hbh
http://tennis.com/yourgame/instructionvideos/backhand/backhand.aspx?id=31272