The phrase "devoted considerable energy" is grammatically correct and can be used in written English.
It means that a significant amount of effort or attention was put into something. Example: Despite facing numerous challenges, she devoted considerable energy into completing the project on time.
Mr. Havens devoted considerable energy to educating young people on ecological issues.
(I am well disposed to it, having devoted considerable energy to the idea in the 1980s).
Later in life, they devoted considerable energy to restoring La Tourbeille, the family home in the Dordogne region of France.
In retirement he devoted considerable energy to the revival of lost works, in particular those of Robert Helpmann.
At the same time, they devoted considerable energy to charitable activity and used their growing influence to advance the civil and political rights of Jews.
Their intelligence service has devoted considerable energy to discovering links between Al Qaeda and Pakistani extremist groups that oppose India's presence in Kashmir.
Like John Cheever, she devoted considerable energies to convincing people of her august lineage.
During his papacy, Pope Benedict XVI devoted considerable energies to bringing the group into the fold, and the church has never fully abandoned that effort.
In addition to his activities at Mount Sinai, Dr. Green devoted considerable energies to national and international professional organizations including the Association for Medical School Pharmacology, the American College of Neuropsychopharmacology, the American Society for Pharmacology and Experimental Therapeutics and the International Union of Basic and Clinical Pharmacology.
Therefore, raising sufficient funds has always been a serious challenge, to which I have devoted considerable energies throughout my last three-and-a-half years in Moscow.
In treating race, he devotes considerable energy to upbraiding a wealthy and paranoid black entrepreneur who sees racist conspiracies everywhere.
