to establish a national park after the model of Yellowstone National Park in Wyoming, United States, and so further areas were acquired. When the New Zealand Parliament passed the Tongariro National Park Act in October 1894, the park covered an area of about 252.13 km2, but it took until 1907 to acquire the land. When the Act was renewed in 1922, the park area was extended to 586.8 km2. Further extensions, especially Pihanga Scenic Reserve in 1975, enlarged the park to its current size of 786.23 km2. The last modification to the Act was passed in 1980. Tongariro National Park has been under the control of the New Zealand Department of Conservation since the creation of the department in 1987. The first activities in the young Tongariro National Park were the construction of tourist huts at the beginning of the 20th century. But it was not before opening of the railway in 1908 and the building of roads in the 1930s that a significant number of people visited the park. The second Tongariro National Park Act, in 1922, started some active conservation efforts, but it was not until 1931 that the first permanent park ranger began work. Road construction into Whakapapa valley had already begun in the 1920s. The first ski hut was built in 1923 at an elevation of 1770 m, thereafter a road, and, in 1938, a ski lift in the area. This early tourist development explains the rather uncommon existence of a permanently inhabited village and fully developed ski area within a national park. The hotel Chateau Tongariro, which is still the centre of Whakapapa today, was established in 1929. In the early 20th century, park administrators introduced heather to the park, for grouse hunting. Grouse were never actually introduced, but the heather is sprawling, threatening the ecological system and endemic plants of the park. Efforts are being made to control the plant's spread, however complete eradication seems unlikely. Tongariro Power Scheme The Tongariro Power Scheme was designed to preserve and protect the natural surroundings as much as possible. It gathers water from the mountains of the central volcanic plateau, passes it through Rangipo (120MW) and Tokaanu (240MW) power stations, and releases it into Lake Taupō. The scheme taps a catchment area of more than 2600 km2 and uses a series of lakes, canals and tunnels to take water to the two stations which typically generate 1400