"Breaking, Lorde ends the pandemic with Solar Power," one fan wrote.
Another tweeted: "solar power by lorde isn't just a song. it's a cultural reset, a lifestyle, a reason to breathe and open your eyes in the morning, a work of art, a hug from a loved one, everything you ever wanted, everything you ever needed."
But others weren't so happy with Lorde's new sound. While her Melodrama collaborator, musician Jack Antonoff, returns to back the song with guitar instrumentals, it is a departure from what fans may have expected.
"I don't think solar power is bad or anything but it is kind of underwhelming," a fan wrote, but noted it could just be the initial taste of the album's vibe.
Among the several initial hot takes were comparisons to not one, but two movies. So what's the truth Lorde - is your new universe daytime horror Midsommar or Abba-fuelled Mamma Mia?
Fans in Aotearoa pointed out it was odd timing to release a summery anthem when the country was heading into winter. It seems the singer was prepping for "hot girl summer" and the Northern Hemisphere's summer solstice.
Lorde's mother, Sonja Yelich, welcomed the release of her daughter's new track.
"So excited - welcome to the world #SolarPower," she posted.
The singer did not promote the single yet on her own social media accounts but chose to send an EDM instead.
In an email message to her fans, Lorde expanded on the inspiration behind her new album and talked about the cover art, a long angle shot that shows her butt.
"I made everything with friends here in New Zealand. My best mate Ophelia took the cover photo, lying on the sand as I leapt over her, both of us laughing.
"The director who made my first ever music video, Joel, helped me create the videos, building an entire cinematic universe that I can't wait for you to see."
She says the new album "encapsulates" where she's from.
"Her feet are bare at all times. She's sexy, playful, feral, and free. She's a modern girl in a deadstock bikini, in touch with her past and future, vibrating at the highest level when summer comes around," Lorde wrote.
"Her skin is glowing, her lovers are many. I'm completely obsessed with her, and soon you will be too."
