economic significance, which contributes over 15% to the Gross Domestic Product of Indonesia. Industry East Java has a number of large industries, including the largest shipbuilding shipyard in Indonesia, PT PAL in Surabaya, military industrial by Pindad in Southern Malang, largest railway industry in Southeast Asia, Industri Kereta Api (INKA) in Madiun, PT Tjiwi Kimia, a paper mill company based in Sidoarjo, Kertas Leces based in Probolinggo); cigarette factories (Wismilak in Surabaya, Gudang Garam in Kediri, Sampoerna in Surabaya and Bentoel in Malang). In Gresik there are Semen Gresik, and PT Petrokimia Gresik. In Tuban there are the largest cement factories in Indonesia, namely Semen Indonesia (ex-Semen Gresik), and Semen Holcim and the Petrochemical Refinery Area. The government has established 12 industrial estate companies, including Surabaya Industrial Estate Rungkut (SIER) in Surabaya, Pasuruan Industrial Estate Rembang (PIER) in Pasuruan Regency, Madiun Industrial Estate Balerejo (MIEB) in Madiun, Ngoro Industrial Park (NIP) in the Mojokerto Regency, Jabon Industrial Zone in Sidoarjo Regency, and Lamongan Integrated Shorebase (LIS) in Lamongan Regency. Small industrial centers are spread throughout the districts / cities, and some of them have penetrated exports; The leather craft industry in the form of bags and shoes at Tanggulangin, Sidoarjo is one of the very famous small industries. Energy and power plant The Cepu Block, one of the largest oil producers in Indonesia, is refined in Bojonegoro. The power plant in East Java is managed by PT Pembangkit Jawa Bali (PJB), which includes hydroelectricity power plant (Ir. Sutami, Selorejo, Bening), thermal power station in Paiton, Probolinggo Regency; which provides electricity to the Java-Bali system. Some regions develop micro hydro power plants, and solar energy. Transportation Roads East Java is crossed by several national roads as primary arterial roads, including the northern coastal national road or locally known as pantura road (Anyer-Jakarta-Surabaya-Banyuwangi), and inland national roads (Jakarta-Bandung-Yogyakarta-Surabaya). The expressway network in East Java covers the Surabaya-Gempol Toll Road; Gempol-Pandaan; Pandaan-Malang; Gempol-Pasuruan; and Pasuruan-Probolinggo which connects the northern and middle East Java regions with the southern and eastern salient (tapal kuda), the Surabaya-Gresik Toll Road that connects the middle and southern East Java to the north, and the Surabaya-Mojokerto Toll Road; Mojokerto-Kertosono; Ngawi-Kertosono; and Solo-Ngawi which connects East Java with Central Java. Suramadu Bridge that crosses the Madura Strait connects Surabaya and Madura Island. In the near future, the construction of the Probolinggo-Banyuwangi Toll Road will be realized, which is the final