Trip-hop pioneers Portishead and U.S hip-hop duo Outkast are amongst the first wave of acts announced for this year’s Electric Picnic. With tickets for the festival going on sale at 7pm tonight, the following acts were revealed to play the festival, taking place at Stradbally Estate, Co. Laois from Friday 29 to Sunday, August 31: Portishead Outkast Beck Foals Pet Shop Boys Paulo Nutini Chic featuring Nile Rodgers Lily Allen St. Vincent Simple Minds London Grammar Metronomy Slowdive Laura Mvula Annie Mac Flume The Stranglers Stephen Malkmus & The Jicks The Blades The Wailers Omar Souleyman White Denim Temples Sohn Jungle…