I think what Sz is referring to is more of a front snap-kick then a roundhouse/thai kick.
There are couple of little things you can do to put more power behind them. First off is to pivot on the ball of your planted foot as you do them. If you don't swivel enough (almost 180 degrees) your hips will keep your foot from being able to have full power.
Another good tip is to lead with the hip. This telegraphs just a little, but it puts alot more power behind the kick. Essentially, start swiveling your body before your leg.
Yet another good tip is to not lock out (or nearly lock out) your knee at the point of impact. This is more of the way I learned my kempo roundhouses whereas my thai roundhouses are brought in and strike essentially with a bent knee on the lowest part of the shin to maximize the power. There should almost be a little push off with the leg at the point of impact as well. You can practice this by striking very slowly against a bag, making sure your knee is bent, and then straightening your leg at the point of impact such that it pushes your leg back away.
Hope this helps.
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