American astronaut Scott Kelly, posted an aerial photo of Calgary to Twitter Saturday taken from the International Space Station (ISS) showing the impact of Calgary’s transition to LED streetlights.

The Rothney Astrophysical Observatory, pushed for a transition, shifting from high pressure sodium vapour lamps (HPS) to LED, with the goal of replacing 80,000 of the city’s streetlights by 2018.

The new lights are not only more energy efficient, but they’re also expected to save the city approximately $6 million per year. As of right now, 21 communities have gone LED — a rate of about 2,000 lights replaced per month.

Here’s a good photo comparing Kelly’s photo to the one Canadian astronaut Chris Hadfield took in 2013, you can easily spot the neighbourhoods that have changed most in two years.

Check out the photo below to see neighbourhoods that have converted to LED:

Calgary from space