Vattenfall aB GeneRatIOn nORDIC CeRtIfIeD enVIROnmental ...

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4 Additional environmental information Harsprånget (quality level C1) Biotope classification and characterisation before exploitation are based on aerial photographs, data inventories, descriptions in Vattenfall’s archives, and on documentation brought before the Vattendomstolen (Water Court). Critical biotope (streaming water and rapids) constituted 25 % of used area, whereas the remainder was general biotope. After exploitation conditions have not been inventoried, and a characterization key has been applied. Before exploitation data showed the presence of a number of red-listed species such as the moss Cinclidotus fontinaloides, the lichen Everina divaricata, and Calypso bulbosa. The existence of these species after exploitation is unknown and consequently a characterisation key was applied. General biotope is assigned to areas where no technotope is registered. Porsi (quality level C2) Before exploitation data from the area around Porsi power station is nonexistent, and a characterisation key has been applied. Assessment of after exploitation conditions is based on inventoried biological data and shows that app. 82 % of the area constitutes general biotope, while the slope of the dam (0,2 % of the area), after recently performed dam safety measures, is technotope. The slope used to harbour the red-listed moonwort species Botrychium matricariifolum and Botrychium multifidum was identified as a mix of rare and critical biotopes at the time. Before the dam was reinforced, the richest parts of the slope were dug up and transplanted to a nearby location, where the development of the red-listed species is being monitored. This new area constitutes critical biotope, because of the occurence of the moonwort species. The remaining area constitutes technotope, particularly in the reservoir drawdown zone, but also on dumps and built-up areas. Boden (quality level C5) Characterisation keys have been applied to before and after exploitation conditions at the Boden power station. The reservoir, built-up areas and spillways without vegetation are characterised as technotope, but constitute merely 1 % of the area. Virtually all the area related to Boden power station after exploitation is general biotope. 4.2.1.2 Mellannorrland In the river region Mellannorrland four stations have been studied in the rivers Ume älv, Indalsälven, and Ångermanälven. River region Mellannorrland is characterised by vast water reservoirs and a large annual average hydropower generation. The four stations exploit 51 % of the total land and water area that is exploited by the 14 selected stations and they contribute app. 32 % to the annual average generation. River Ume älv Area and biotope data has been compiled for and presented in previous EPD. Input data regarding the dam at Umluspen power station as well as the average annual generation data has however been updated. Juktan (quality level B2) There is poor historical data from the area around the power station at Juktan, and an area-specific standard list has been applied to before exploitation conditions. The inundated area (predominantly coniferous forest on moraine) was characterised by Svenska Naturskyddsföreningen (1960) as having “meager vegetation”. With the exception of agricultural areas, the inundated area was a general biotope. The streaming water in the river Juktån is characterised as critical biotope both before and after exploitation. More than 40 % of critical biotopes remain after exploitation, but rare biotopes are nonexistent. Approximately 4 % of both critical and rare biotopes before exploitation have become general biotope or technotope after exploitation. During the timber-floating period Juktån underwent substantial river training that resulted in a canal-like bottom structure in large parts of the river, which in turn had negative impact on fish and other organisms. In addition, important reproduction areas for fish, e.g. by/side-runs were closed off by levees and similar constructions. © Vattenfall AB Generation Nordic 2008 29
4 Additional environmental information In conjunction with the retrial of the regulation permits in the early 1990’s, Vattenfall implemented extensive restoration of biotopes, amounting to 144 ha (55 %) of streaming water in Juktån. In addition, 14,6 ha (almost 6 %) new biologically important area was created, mainly by opening previously closed off by/side-runs, etc. There are now vital populations of grayling and trout. Conclusions: • Despite reduced average annual discharge, the critical biotope area (i.e. the area covered by water during winter conditions) has only been marginally reduced. • As a result of biotope restoration, Juktån now provides improved conditions for biological life compared to the timber-floating period. • Reopening of previously closed off waterways has created important reproduction areas for fish. Umluspen (quality level C5) Historical data from the area around the power station at Umluspen is nonexistent, and a characterization key has been applied to before exploitation conditions. It is assumed that the area harboured 40 % critical biotope, 40 % rare biotope, and 20 % general biotope. A characterization key has been applied to the after exploitation conditions as well. Land and water areas after exploitation have been assumed to be 31 % technotope and 69 % general biotope. Stornorrfors (quality level C2) Historical data from the area around the power station at Stornorrfors is insufficient, and a characterisation key has been applied to before exploitation conditions. Characterisation of after exploitation conditions is based on data from fieldwork and literature. Technotopes existed even before Stornorrfors was constructed because of three older smaller power stations in the same area. The present reservoir inundated the older Norrfors reservoir drawdown zones, which were thus converted from technotope to general biotope. There was also a spillway within the area, which is now inundated upstream the present one. The reservoir and the stretch of the river with an ecological flow were influenced by timber-floating and fishing operations prior to the construction of Stornorrfors. One part of the river stretch is characterised as critical biotope today, and harbours migrating red-listed wild salmon. Vattenfall has implemented activities to facilitate fish migration. There remain 5,4 % critical biotopes and 2 % rare biotopes after exploitation. The following map show biotopes and biotope categories at Stornorrfors power station after exploitation. © Vattenfall AB Generation Nordic 2008 30
Page 1 and 2: Vattenfall AB GENERATION NORDIC Cer
Page 3 and 4: SUmmary Distribution of electricity
Page 5 and 6: Content 1 Introduction 1 1.1 Declar
Page 7 and 8: 1 INTRODUCTION 1.3 Vattenfall, LCA,
Page 9 and 10: 2 PRODUCER AND PRODUCT Vattenfall h
Page 11 and 12: 2 PRODUCER AND PRODUCT 2.4 Electric
Page 13 and 14: 3 Environmental performance based o
Page 15 and 16: 3 Environmental performance BASEd o
Page 30 and 31: 4 Additional environmental informat
Page 48 and 49: 5 Information from the CERTIFICATIO

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