Twitch, the videogame-casting company owned by Amazon, will provide wall-to-wall live coverage of E3 next week — and, for the first time, will let users “co-stream” all of Twitch’s broadcasts from the convention on their own channels.

The idea behind Twitch’s new twist: to broaden the reach of its E3 programming via its base of 1.5 million individual broadcasters, giving them the opportunity to overlay their own commentary on the news as it breaks.

This is Twitch’s second year of its exclusive three-year deal as the official live-streaming platform of Electronic Entertainment Expo, which is owned by the Entertainment Software Assn.

In addition to broadcasting all E3 2015 press conferences and the PC Gaming Show, Twitch will host demos by more than 30 publishers and developers at its booth at the Los Angeles Convention Center. Also, for the first time, Twitch is teaming with broadcasting partners from several countries providing localized content, including a German-language presentation from Rocket Beans TV and a French feed from Jeuxvideo.

Twitch’s 2015 E3 lineup is slated to include the “Day 0” live broadcast on June 15 — a day before the expo opens — running from 9 a.m. to 7:30 p.m. PT. That will include press conferences, interviews with developers and publishers, and exclusive game and gameplay reveals.

The coverage will be anchored by on-staff hosts Jon Carnage, Twitch live programming director; Marcus “djWHEAT” Graham; and Jordan “Soma” Tayer. They will be joined by guest hosts MANvsGAME, Ezekiel_III, Swiftor, Seltzer, Anna Prosser and djminiWHEAT.

“The Twitch community is the single most active, socially engaged group of gamers in the world,” Carnage said. “By having the industry’s most comprehensive collection of live streamed content, this is shaping up to be our biggest E3 to date.”

Companies skedded to present at Twitch’s E3 booth are scheduled to include 2K, Activision, Bandai Namco Entertainment America, Blizzard, Deep Silver, Devolver, Disney Interactive, EA, Konami, Microsoft Studios, Nintendo, PlayStation, Reverb, Square Enix, Tiny Build Games, Ubisoft and Warner Bros. Interactive Entertainment.

For its E3 coverage, Twitch has lined up sponsors including Microsoft Xbox, which will present the Xbox ESports Celebrity Challenge & Twitch Party on June 16, as well as headset and audio-tech vendor Turtle Beach.

Amazon bought Twitch in August 2014 in a deal worth around $970 million, after YouTube’s preliminary pact to acquire the company fell apart.

In 2013, the Entertainment Software Assn. signed a three-year deal with the L.A. Convention Center and has been considering bids by other cities to host the convention starting in 2016.