In fact, another recent study, this one in The Astrophysical Journal, presents some of the first ever proof that black holes can actually lose energy, which lends to the idea that it can be harvested via a mechanism known as the Blandford–Znajek process.

Source: https://www.salon.com/2023/12/08/juicing-power-from-the-abyss-how-black-hole-batteries-could-be-the-energy-of-the-distant-future/

The results were published in the Astrophysical Journal in a study titled "An FRB Sent Me a DM."

Source: https://phys.org/news/2023-03-fast-radio-searchlights-gas-milky.html

Van Dokkum is the lead author of a research article on the black hole published in The Astrophysical Journal Letters.

Source: https://indianexpress.com/article/technology/science/runaway-black-hole-rockets-through-space-8545508/