70% of the factory's energy needs, and since 2002 the company has been run entirely on renewable energy. The monomaterial chocolate packaging is designed to minimize its ecological footprint and is recyclable. The company has been certified to ZNU standard. The Ritter Museum, opened in 2005, contains the collection of Marli Hoppe-Ritter, which consists of nearly 600 paintings, objects, sculptures and graphic works, a breadth of painterly and sculptural confrontation with the square form used as the design for the Ritter chocolate. The museum is an extension of the factory's 'ChocoShop', which was opened in 2001. The museum, on Alfred-Ritter-Straße 27, is a cubical building with limestone wall covering; a 12-metre-high central open passage is meant to draw in the landscape, and the large window allows a view through the building. It was designed by Max Dudler and Susanne Raupach. On the whole their products are neither certified organic nor certified fair trade. However, in April 2008 they launched an organic product line called "Ritter Sport Bio". The firm celebrated its centenary in 2012 by touring 19 German cities between March and September on 'the Colourful ChocoTour'. A limited-edition anniversary bar was released: Edel-Nuss Mix – Plain milk chocolate with macadamias, cashews, and almonds. Also in 2012 Ritter expanded its initiative in Nicaragua by setting up a new cocoa plantation. The first harvest was in 2017. In 2013 Ritter opened another shop at Ravensburger Spieleland, a German theme park, and the next year Ritter's first pop-up shop appeared in Hamburg for four months. In 2017 Ritter released its first certified vegan bars, Dunkle Voll-Nuss Amaranth (hazelnut cream chocolate with amaranth and nuts) and Dunkle Mandel Quinoa (hazelnut cream chocolate with quinoa and almonds). As of February 2017 they were on sale only in Germany. The new releases, costing €2 each, target the growing vegan population in Germany. A third bar, Sesam (almond cream chocolate with sesame), was released in February 2020. In July 2018 Ritter announced its intention to attempt to release the Schoko & Gras variety, a milk chocolate with roasted hemp seed filling, in the United States for World Cannabis Day 2019, retitled 'Choco & Weed'. As of January 2019 it had yet to be approved for sale. In 2018 Ritter released a limited edition bar made from the first viable harvest of their Nicaraguan cocoa plantation. It was limited to 30,000 bars and was available in the