The phrase "almost as powerful" is correct and usable in written English.
It can be used to compare the strength or effectiveness of two things, indicating that one is nearly equal in power to the other.
Example: "The new software is almost as powerful as the previous version, making it a strong contender in the market."
Alternatives: "nearly as strong" or "close in power".
He was almost as powerful as the Lord Chancellor, and had wielded judicial power since the time of Edward I.
"It's a very powerful job, almost as powerful as the mayor of the city of Chicago," Professor Starks said.
Black trumpets are almost as powerful as the high-priced fungus but are irresistible from the first bite.
The Pistons, of course, don't have Michael Jordan, but Detroit has something almost as powerful, albeit more intangible.
Bornholm's fraught 11-month occupation by Russian troops left almost as powerful a mark on the local psychology as the five-year German invasion that preceded it.
Both pack 270 horsepower engines and battery systems that are almost twice as powerful as the Prius's.
The BOLT, when outfitted with a chunk of RAM, is, according to the creators, "almost twice as powerful as a MacBook Pro 13-inch equipped with an Intel i5, and three times more powerful than a Mac Mini".
He didn't like the idea of killing, as he said, 'all those kids.' " A little more than seven years later, in 1952, the first thermonuclear weapon, almost five hundred times as powerful as the bomb dropped on Hiroshima, was tested near the Enewetak Atoll, in the Pacific Ocean.
If Facebook gets its Open Graph protocol right, they will have created something almost as robust and powerful as a government, only nimbler and more resilient.
Adopting a Mediterranean diet - olive oil, nuts, oily fish, plenty of fruit and vegetables and a moderate amount of red wine - after a heart attack is almost three times as powerful in reducing mortality as taking a statin, writes Dr Malhotra.
