Other previous winners since the prize category was created in 2008 include Adele, Sam Fender and The Last Dinner Party.
Rose said she hadn’t initially believed her team when they told her she had been nominated, but was “buzzing” to have been selected.
The east London artist launched into the year with her debut album, Louder, Please, an infectious dance-pop record which propelled her career.
However, the 28-year-old has been honing her songwriting craft since her days at the Brit School, which also boasts artists like Amy Winehouse and Raye among its alumni.
“I’ve only put out one album and I’ve got many albums in me,” she told Newsbeat.
“So I just feel like it sets me up for a year of making, releasing music, playing shows…
“I also feel like not many people know who I am yet, so it’s going to introduce me to a whole new audience.”
Over the past year she has shared stages with hit acts like Confidence Man and the Sugababes, and has introduced herself to a host of new listeners when opening for some of Kesha’s North American tour.