The phrase "are actually powerful" is correct and usable in written English.
You can use it to emphasize the true strength or effectiveness of something, often in contrast to a common misconception.
Example: "Many people underestimate the impact of small changes; they are actually powerful in driving significant results."
Alternatives: "are truly impactful" or "hold significant power."
Jon Stewart was essentially right about this on Monday evening, when he addressed Morsi and said: "When you are actually powerful, you don't have to be petty".
Now scientists studying the cocoa tree, whose beans are used to make chocolate or cocoa, say these fungi, which many had suspected were parasites, are actually powerful protectors able to fend off plant diseases.
Draped in Marion Cito's full-length thin satin gowns – which initially suggest glamour but are actually powerful props, like shields or comforters; they are slipped off suggestively, then shrugged back on protectively – this magnificent seven criss-cross before us, joking, screaming, running, pointing, cartwheeling, sleeping and drinking champagne.
The heroines are actually powerful characters that Katie herself has created; her drawing is a form of therapy that helps her process her experiences and decisions.
The things we think are powerful or failures, and the things that are actually powerful or failures, can be very different.
They're actually powerful computers that are also phones.
What's actually powerful is when individuals work together to produce a generative response, something that actually demonstrates the potential of future culture instead of wallowing in whatever shitty event disappointed them.
We are actually least powerful when we are trying to be something we are not.
Because relationships are actually a powerful technology that develops human beings, and by extension, humanity.
Ming Micro doesn't have built-in collision detection or gamepad interaction, but instead it has graphical capabilities that are actually more powerful than Ming Mecca.
Women are actually more powerful in entertainment than people understand, and the next ten years will see many changes for the better for women in entertainment.
