This method, however, only provides a temporary short-term substitute for traditional underground storage. Gas can be stored above ground in a gasholder (or gasometer), largely for balancing, not long-term storage, and this has been done since Victorian times. These store gas at district pressure, meaning that they can provide extra gas very quickly at peak times. Gasholders are perhaps most used in the United Kingdom and Germany. There are two kinds of gasholder — column-guided, which are guided up by a large frame that is always visible, regardless of the position of the holder; and spiral-guided, which have no frame and are guided up by concentric runners in the previous lift. Perhaps the most famous British gasholder is the large column-guided "Oval gasholders" that overlooks The Oval cricket ground in London. Gasholders were built in the United Kingdom from early Victorian times; many, such as Kings Cross in London and St. Marks Street in Kingston upon Hull are so old that they are entirely riveted, as their construction predates the use of welding in construction. The last to be built in the UK was in 1983. Interstate pipeline companies rely heavily on underground storage to perform load balancing and system supply management on their long-haul transmission lines. FERC regulations though demand that these companies open up the remainder of their capacity not used for that purpose to third parties. Twenty-five interstate companies currently operate 172 underground natural gas storage facilities. In 2005, their facilities accounted for about 43 percent of overall storage deliverability and 55 percent of working gas capacity in the US. These operators include the Columbia Gas Transmission Company, Dominion Gas Transmission Company, The National Fuel Gas Supply Company, Natural Gas Pipeline of America, Texas Gas Transmission Company, Southern Star Central Pipeline Company, TransCanada Corporation. Intrastate pipeline companies use storage facilities for operational balancing and system supply as well as to meet the energy demand of end-use customers. LDCs generally use gas from storage to serve customers directly. This group operates 148 underground storage sites and account for 40 percent of overall storage deliverability and 32 percent of working gas capacity in the US. These operators include Consumers Energy Company and the Northern Illinois Gas Company (Nicor), in the US and Enbridge and Union Gas in Canada. The deregulation activity in the underground gas storage arena has attracted independent storage service providers to develop storage facilities. The capacity made available would then be leased to third-party customers such as marketers and electricity generators. It is expected that in the future, this group would take more market share, as more deregulation takes place.