The architects are MANICA Architecture and Foster and Partners. Lusail Sports Arena is another sporting venue in the city and hosted matches of the 2015 World Men's Handball Championship. Constructed at a cost of $318 million, it has a capacity of 15,300 spectators and opened its doors in 2012. Located just outside the city is the Losail International Circuit, which has hosted the Qatar motorcycle Grand Prix every year since 2004. Since 2007 it has been the opening round of the MotoGP world championship, and in 2008 floodlights were installed to the facility, making it the only race on the calendar to be held at night. The first Qatari Diar Triathlon will be held in the Spring of 2019 in Lusail City-Marina Promenade. This event will provide participants and spectators an opportunity to see the amenities available in Lusail City. Numerous non-energy related companies are also headquartered in Lusail. Hotel operator and developer Katara Hospitality is based in the city, as is Qatari Diar Real Estate Investment Company and its subsidiaries, such as Lusail Real Estate Development Company and utilities company Marafeq Qatar. Qatari Diar was responsible for launching the Lusail City Development Project in 2005. The Lusail Industrial Area hosts many construction companies. In the Lusail Ready-Mix Batching Plant Zone, two ready-mix batching plants are maintained by Qatar Alpha Beton Ready Mix, one ready-mix batching plant is maintained by SMEET, REDCO owns a precast plant, Qatar Concrete has 1 ready-mix batching plant, and HBK ReMIX operates a ready-mix factory. As part of Lusail's master plan, the city is ultimately set to contain 36 schools with a capacity for 26,000 students. Upwards of 75,000 m² has already been reserved for school buildings by the Lusail City Real Estate Development Company; these schools are expected to be commissioned by 2019. A network of gas pipelines will transport synthetic natural gas (SNG) to the city. Distributed by a gas pipeline with a length upwards of 150 km², up to 28,000 m3/hr of natural gas will be fed from the Lusail City Gas Farm. Lusail's SNG system was developed as part of a joint venture between the National Gas Company of Oman and Qatari company Petro Serv Limited. In regards to power stations, 66 kV and 11 kV substations will be constructed. The latter will be built underground in specialized structures.