The phrase "maintain its power" is correct and usable in written English.
It generally means to keep or sustain the power or strength that something has. For example: The government is working hard to maintain its power in the region.
The White House allows leaks—even if those leaks hamper and embarrass it in the short run because they help it maintain its power in the long run.
How it doles out its rewards to maintain its power.
The ruling elite needs this state in order to maintain its power.
The first article was a jumbled tale about a family that plots to kill millions of people to maintain its power and quash democracy.
Mr. Draskovic has repeatedly accused the government of trying to kill him and has warned that Belgrade is waging a campaign of "state terrorism" to maintain its power.
The work doesn't always maintain its power; Mr. Zustiak sometimes slips into overused tropes like hysterical laughter or a motif in which one person urgently seeks the embrace of a passive partner.
In a letter to the state's Public Service Commission, 13 Democratic Assembly members yesterday accused Consolidated Edison of contributing to the nine-day blackout in western Queens last month by failing to maintain its power-distribution network properly and by ignoring warnings from previous power failures.
Conclusion: The VHI is a powerful tool for quantifying patients' perceptions of their voice handicaps, and it maintained its power across translation.
If Irma maintains its power, it will be stronger than both Harvey and Katrina, which was only a Category 3 when it made landfall on the Louisiana coast in 2005.
The Cortes, while not as important as the comuneros had hoped, nevertheless maintained its power; it was still required to approve new taxes and could advise the king.
Van Eyck's artistic vision, static and formal though it is, also has maintained its power, imbuing everything he painted with a spiritual presence, for all his unbridled love of material appearances.
