home advantage is lost; a factor which contributed in part to the staging of the 2007 derby at Nihondaira despite demand for tickets far outstripping supply. The decision paid off with a home victory. 2007 saw all home games staged at Nihondaira for the first time since 1999. This was repeated in 2008, although between 2009 and 2015 Ecopa was used for at least one home league game. S-Pulse have chosen not to use Ecopa since 2015, playing all home league games at Nihondaira. Naming rights In October 2008 it was announced that naming rights would be sold for Nihondaira Stadium. In late November 2008 a deal was announced which would rename the stadium Outsourcing Stadium Nihondaira. The contract will run for four years starting from the 2009 season, and would be worth 90 000 000 per year. A new 5-year deal sponsorship deal with IAI Corporation, a manufacturer of industrial robots, took effect on 1 March 2013. The stadium was renamed IAI Stadium Nihondaira, shortened by the club and supporters to I Sta. This sponsorship deal was extended a further five years in 2018. Future After filling Nihondaira on average over 81% for league games in 2008, in November of the same year the club expressed its desire for the ground, which is owned by Shizuoka City, to have its capacity expanded. In 2020 the club restated their hope to build a new, larger home. In recent years various locations have been cited as a potential location for a new stadium, including next to Higashi-Shizuoka Station, and next to Shimuizu Station. Training ground Located near the famous Miho no Matsubara are S-Pulse's main training facilities. Named Miho Ground, training session are sometimes open to the public for autograph hunters. The Miho Ground has also housed the club offices since the club's foundation. Rivalries S-Pulse share Shizuoka Prefecture with fierce local rivals Júbilo Iwata. The rivalry dates back to the formation of the J.League when the newly formed S-Pulse were chosen ahead of Júbilo to take part in the first J.League season. Jubilo, who had existed as Yamaha FC in the Japan Soccer League since 1980, had to earn promotion via the 1992 season of the new Japan Football League. This has remained a bone of contention between long standing fans. With Shizuoka long recognised as the homeland of football in Japan, the two teams have a history of fighting