Coire Glas pumped stroage scheme NTS - SSE plcsse.com/media/69393/nontechnicalsummary.pdfCoire Glas...

February 2012

Coire Glas Pumped Storage SchemeNon-Technical Summary

For:By:

COIRE GLAS PUMPED STORAGE SCHEME

NON-TECHNICAL SUMMARY

February 2012

ASH design+assessment

21 Gordon Street

Glasgow

G1 3PL

Tel: 0141227 3388 Fax: 0141 227 3399

email: [email protected]

www.ashdesignassessment.com

Coire Glas Pumped Storage Scheme; Non-Technical Summary

February 2012 i

CONTENTS

CONTENTS .......................................................................................................................................................... I

FIGURES ......................................................................................................................................................... II

1 INTRODUCTION AND BACKGROUND............................................................................................ 1

2 CONSIDERATION OF ALTERNATIVES .......................................................................................... 3

3 DESCRIPTION OF DEVELOPMENT ................................................................................................ 5

4 HYDROLOGY AND WATER MANAGEMENT .................................................................................. 8

5 SCOPING OVERVIEW ..................................................................................................................... 9

6 LAND USE AND RECREATION ..................................................................................................... 10

7 LANDSCAPE CHARACTER ........................................................................................................... 11

8 VISUAL AMENITY .......................................................................................................................... 12

9 TERRESTRIAL ECOLOGY (VEGETATION) .................................................................................. 13

10 TERRESTRIAL ECOLOGY (ANIMAL SPECIES) ............................................................................ 14

11 BIRDS ............................................................................................................................................ 15

12 AQUATIC ECOLOGY ..................................................................................................................... 16

13 FISH ............................................................................................................................................... 17

14 CULTURAL HERITAGE ................................................................................................................. 18

15 TRAFFIC AND TRANSPORT ......................................................................................................... 19

16 NOISE ............................................................................................................................................ 20

17 PLANNING POLICY ....................................................................................................................... 21


February 2012 ii

FIGURES

Figure 1: Location Plan

Figure 2: Scheme Overview

Figure 3: Visualisation of Proposed Outlet Area

Figure 4: Visualisation of Proposed Dam from Kilfinnan Glen


February 2012 Page 1

1 INTRODUCTION AND BACKGROUND

1.1 Background to the Scheme

1.1.1 SSE Renewables Developments (UK) Limited (SSE Renewables), the renewable energy

development division of Scottish and Southern Energy plc (SSE), is proposing to construct a

new Pumped Storage scheme between Loch Lochy (lower reservoir) and a new reservoir

created at Loch a’ Choire Ghlais (upper reservoir). The primary function of Coire Glas Pumped

Storage scheme (‘the Development) would be to extract, store and release energy to or from

the electricity transmission system as required to help balance supply and demand for power

at a national scale.

1.1.2 The Development is located close to Kilfinnan Farm, approximately 13 kilometres (km) to the

south west of Fort Augustus, as shown on Figure 1.

1.1.3 The Development would consist of a new dam and reservoir at Loch a’ Choire Ghlais, an

underground cavern power station and underground tunnel system, an outlet area on the

shore of Loch Lochy comprising tunnel portals, a tail race structure, jetty and administration

building, as well as access tracks to the outlet area and dam.

1.1.4 Hydro power is a very flexible method of electricity generation due to its ability to rapidly start

and stop without constraint. Pumped storage plants add to this the ability to consume and

store large quantities of energy, making them the most flexible of all electricity generation

technologies. Pumped storage is in fact the only mature energy storage technology which can

be deployed on such a large scale.

1.1.5 The installed capacity for the Development would be up to 600 Megawatts (MW), with an

energy storage capacity of up to 30 Gigawatt Hours (GWh).The Coire Glas Pumped Storage

scheme would be unique when compared to other existing pumped storage schemes in the

United Kingdom (Dinorwig, Ffestiniog, Cruachan and Foyers) in its ability to extract and

release energy to or from the electricity transmission system for a much longer period. It is

estimated that this would be in the region of 50 hours continuous pumping or release which is

far greater than the capacity of existing pumped storage schemes in the UK.

1.2 Environmental Assessment

1.2.1 A detailed assessment of potential environmental effects has been undertaken to accompany

an application for consent to the Scottish Ministers under Section 36 of the Electricity Act

1989. This assessment is documented in the Coire Glas Pumped Storage Scheme

Environmental Statement (ES), dated February 2012.

1.2.2 This Non-Technical Summary presents a synopsis of the information contained in the ES and

outlines the different aspects of the Development including the alternatives considered, a

description of the required components and a brief review of those environmental topics which

have been assessed.

1.2.3 The full ES is available at a cost of £150 for a paper copy or £10 on CD directly from Susan

Scobie at SSE Renewables, Inveralmond House, 200 Dunkeld Road, Perth, PH1 3AQ.

1.2.4 Documents can also be viewed and downloaded from www.sse.com/coireglas

http://www.sse.com/coireglas



1.2.5 Alternatively, a copy of the full ES is on public display at the following locations:

Highland Council (Headquarters) Planning Office, Glenurquhart Road, Inverness, IV3

5NX;

Highland Council Planning Office, Kintail House, Beechwood Business Park,

Inverness, IV2 3BW; and

Highland Council Service Point, Memorial Hall, Fort Augustus, PH32 4DJ.



2 CONSIDERATION OF ALTERNATIVES

2.1 Strategic Review

2.1.1 The consideration of pumped storages sites has involved a strategic review of potential

locations throughout Scotland by SSE Renewables, initially examining approximate capital

cost and engineering feasibility.

2.1.2 There are very few sites within the UK which could be considered to have potential for the

development of a viable pumped storage scheme, but Coire Glas ranked highly in this

strategic review and following initial landowner discussions, SSE Renewables decided to

progress technical feasibility and environmental studies.

2.1.3 A further potential pumped storage site was also identified on Balmacaan Estate, to the north

of Invermoriston. SSE Renewables are also progressing this development, known as

Balmacaan Pumped Storage scheme.

2.2 Preliminary Design Alternatives

2.2.1 Whilst certain aspects of the Development are inevitably technically driven, e.g. the location of

the dam and underground power station, other aspects of the Development have been

informed by environmental data gathered from surveys of the wider area, as well as

experience and knowledge gained by SSE Renewables and the EIA team in working with

other large scale hydroelectric projects in the highlands of Scotland (e.g. Glendoe and

Kildermorie).

2.2.2 The scheme configuration presented in the ES is considered to be the optimal design whilst

minimising any environmental impacts where practicable.

2.3 Other Considerations

Rock Disposal

2.3.1 Excavated rock from the underground works would be reused in the localised area of

construction works wherever feasible. However, it is estimated that there will be a surplus of

approximately 450,000 cubic metres of excavated rock which would require disposal. The

majority of rock from the excavated tunnels and cavern chamber would be removed via the

tunnel portals near the shore at Loch Lochy. The preliminary options for rock disposal were

considered as follows, in no particular order:

Use for construction of the dam;

Surface transport to a licensed quarry or stored temporarily for use in other

infrastructure projects in the area;

Water transport by barge and canal network (e.g. to Fort William) for local distribution

to receptor sites (if available); and

Transport by barge and canal network for re-use at sea.

2.3.2 As part of the EIA process ASH and SSE Renewables have held discussions with statutory

consultees to discuss the options available for rock disposal. From these discussions it is clear



that a thorough study into the options for rock disposal should be carried out to identify

potential receptor sites. However, should consent be granted for the Development,

construction may not commence immediately. Therefore it is proposed that the study into rock

disposal options be carried out approximately 12 months prior to construction whereby local

infrastructure projects can be accurately identified. For the purposes of the EIA, it has been

assumed that the disposal of rock would be undertaken using the trunk road network.

Disposal and Re-use of Peat

2.3.3 Disposal and re-use of peat would be an important consideration during the construction of the

Development. SSE are aware of the constraints and opportunities available in the disposal

and re-use of peat following experiences gained at Glendoe Hydroelectric Scheme. Whilst it is

difficult to commit to a specific solution in a construction project of this scale at this stage, a

number of options for peat disposal and re-use have been explored in the ES. These would be

developed by the successful contractor in consultation with statutory authorities prior to

construction commencing.



3 DESCRIPTION OF DEVELOPMENT

3.1 Overview

3.1.1 An overview of the Development is provided in Figure 2, with visualisations provided in

Figures 3 and 4.

3.1.2 The Development would operate by transferring water between Loch Lochy and the enlarged

Loch a’ Choire Ghlais through the underground tunnel and power station system. The

Development would either be operated in the ‘generating’ mode, when electricity would be

generated by releasing water from the upper reservoir through the pump-turbines and into

Loch Lochy, or in the ‘pumping’ mode, when electricity is used to drive water through the

pump–turbines in the other direction from Loch Lochy to the upper reservoir.

3.1.3 The upper reservoir works, including construction of the dam, would be accessed off the A87

at White Bridge (Invergarry) utilising existing forestry tracks (to be upgraded) and the creation

of a new track to the dam site. The lower reservoir works, including the outlet area and

excavation of rock for the underground works, would be accessed off the A82 at North

Laggan, following the minor road and forestry tracks, both of which would require upgrading.

3.1.4 The principal components of the Development is shown on Figure 2 and would comprise:

Dam and Upper Reservoir - A new dam would be constructed to enable the storage

of water, significantly increasing the size of the existing Loch a’ Choire Ghlais to form

the upper reservoir;

Underground Power Station and Waterway System – A series of underground

intakes, chambers and tunnels carrying water would connect the upper and lower

reservoirs, through the underground power station;

Outlet Area – A tailrace structure would be located on the shore of Loch Lochy at the

main access tunnel portal. A jetty and administration building would be located

approximately 250m to the northeast of the tailrace at the access tunnel portal;

Access Tunnels - Tunnels would be provided for accessing the underground power

plant;

Access Roads - Access roads would be provided for the construction of the

Development and for operational and emergency access;

Rock Disposal - Excavated rock from the underground works would be reused in the

localised area of construction works wherever feasible. However, it is estimated that

there would be a surplus of approximately 450,000 cubic metres of excavated rock

which would require disposal. The majority of rock from the excavated tunnels and

cavern chamber would be removed via the tunnel portals near the shore at Loch

Lochy.

3.1.5 In addition to the above, it is anticipated that there would be a need for site establishment and

lay down areas in the vicinity of the upper reservoir and outlet area works. Workers camps

would also be provided for access to both the upper reservoir and outlet area works, as shown

on Figure 2.



3.1.6 In the vicinity of the lower works (the outlet area), the existing forestry roads are incorporated

in the Great Glen Way. Where appropriate for safety, it is proposed to provide a new path to

run parallel to the existing track to separate walkers and cyclists from the works, constructed

to the same standard as the existing Great Glen Way. The path would be constructed in

accordance with the requirements of the Land Reform (Scotland) Act 2003 where this does

not conflict with the health and safety requirements of the construction site. This path would be

constructed at commencement of works in the area and it is proposed that this would remain

in place as a permanent diversion to this section of the Great Glen Way.

3.1.7 The operation of the Development would require the modification of Mucomir Hydroelectric

Power Station at Gairlochy. Control of Loch Lochy water levels is currently determined by the

operation of Mucomir Power Station but the operation of a pumped storage scheme on the

loch would take priority over Mucomir. As such, Mucomir Power Station would be modified and

a new operating regime determined with the aim to provide improved fish passage and flow

management of the River Lochy downstream.

3.2 Site Traffic

3.2.1 Construction traffic to the upper reservoir works would take access from the A87 at White

Bridge (Invergarry), before utilising existing forestry tracks (to be upgraded) and a new track to

the dam site. Construction traffic to the lower reservoir works would take access from the A82

at North Laggan, and then along the existing public road and forestry tracks (both to be

upgraded). All operational or maintenance traffic would also utilise these access routes,

although it is anticipated that the majority of this traffic would require access to the outlet area

at the lower reservoir only.

3.3 Construction Programme / Hours of Working

3.3.1 It is anticipated that the main civil engineering construction programme would last up to five

years and the workforce would average 150 people on site throughout the construction phase,

although the number of construction workers on site would inevitably vary throughout the

construction period depending on the stage of the works.

3.3.2 Normal construction shifts would generally apply for the surface works but these would be

subject to some variation to suit the work in hand and weather conditions, to be agreed with

The Highland Council. It is anticipated that underground operations would need to continue 24

hours a day, seven days a week.

3.4 Socio-economic Aspect

3.4.1 SSE is already a major employer throughout the North of Scotland, currently employing

around 2,000 full time staff in the area. Within the Great Glen region alone, SSE continues to

provide direct employment primarily through the development and construction of generation

or infrastructure improvement projects such as Glendoe Hydroelectric Scheme and Beauly –

Denny overhead transmission line. This direct employment has made a significant contribution

to the local economy within the Great Glen.

3.4.2 SSE is actively supporting the development of the Scottish supply chain and has a

commitment to use local contractors and services where possible and available. In line with

SSE policy, meetings in the local community and throughout the region would be organised

during the detail design process to allow local businesses to see what opportunities projects of



this nature present, as well as to see what services may be provided from the local

community.

Employment Generation during Construction

3.4.3 The construction of the Development is anticipated to last up to 5 years. During this time, the

on-site workforce would vary in number depending on the stage of works but could typically

average 150 people.

Economic Benefits to the Local Community

3.4.4 Local tradesmen, shopkeepers, hoteliers and other sectors of the local community could be

expected to become involved at various stages throughout the work. Direct impacts on the

local economy during the construction phase would be expected to be similar to that

experienced in Fort Augustus during the construction phase of Glendoe Hydroelectric

Scheme.

Employment Generation during Operation

3.4.5 Once operational, the Development would generate approximately 12 additional permanent

jobs. All permanent employees would be based within the administration building at the outlet

area on the shore of Loch Lochy. Permanent management, engineering, technical and

administrative roles would all be required.

3.4.6 SSE would aim to ensure that apprenticeships, the provision of skills and training and link ups

with educational bodies and other stakeholders would be maximised where possible.

Community Benefit Arrangements

3.4.7 Community benefit arrangements for the Development would be discussed and agreed with

community representatives prior to construction taking place. Although there are currently a

number of uncertainties relating to policy on transmission charging and the general economics

of large scale pumped storage, it is likely that community benefit during the construction phase

(up to 5 years) would equate to approximately £500 per MW (installed capacity). SSE’s

general approach to community benefit is to ensure a significant contribution is made to skills

and training investment in the communities they are active in.

Consultations with the Local Community during Construction

3.4.8 Consultation with the Local Community during the construction of the Development would be

an important consideration for SSE and the successful contractor. At Glendoe Hydroelectric

scheme, a statutory agency working group has been set up which provides the local

community with information about key construction activities and a mechanism by which

concerns from within the local community can be shared and discussed. A similar working

group would be established during the construction of the Development.



4 HYDROLOGY AND WATER MANAGEMENT

4.1 Introduction

4.1.1 The principle of a pumped storage scheme broadly involves a system to transfer water

between a lower reservoir (Loch Lochy) and an upper reservoir (Loch a’ Choire Ghlais). In the

case of the Development, the upper reservoir would need to be formed by the creation of a

new dam and reservoir at Coire Glas, which would inundate the existing Loch a’ Choire Ghlais

and impound the Allt a’ Choire Ghlais at this location.

4.2 Water Management

4.2.1 Loch Lochy is currently controlled by SSE Generation Ltd at its existing hydroelectric power

station at Mucomir (Gairlochy). Water is released from here through turbines to the River

Spean and there are also floodgates to discharge larger flows as required.

4.2.2 The operation of the Development would take priority over the operation of Mucomir Power

Station, which would be managed to ensure that the operation of the Development was not

constrained by Loch Lochy levels. Ultimately the total volume of water passed through the

barrage in a year would remain unchanged.

4.2.3 As part of the construction of the Development, Mucomir Power Station would be modified and

a new operating regime determined with the aim to provide improved fish passage and flow

management of the River Lochy downstream. This would include obtaining all necessary

consents and relicensing. It is possible, although not guaranteed, that this modification may

involve partially or completely decommissioning Mucomir as a power station and operating it

solely as a regulating barrage and fish pass.

4.2.4 Although the present maximum and minimum loch levels would not change, variations in Loch

Lochy level between these limits could be expected to be more frequent.

4.2.5 At the dam, a Q95 compensation flow would be released from the upper reservoir to maintain

a constant flow from the upper reservoir down Allt a’ Choire Ghlais.



5 SCOPING OVERVIEW

5.1 Introduction

5.1.1 In September 2009, SSE Renewables sent Scottish Ministers a copy of their preliminary

environmental scoping report (prepared by ASH design+assessment), identifying the potential

significant impacts to be addressed in the ES. During March 2010, Scottish Ministers issued

their Scoping Opinion for the Development, which defined what issues should be addressed.

5.1.2 In addition to the scoping exercise, consultations have continued throughout the assessment

process to:

Ensure that statutory and other bodies with a particular interest in the environment are

informed of the Development and provided with an opportunity to comment;

Obtain baseline information regarding existing environmental site conditions;

Establish key environmental issues and identify potential impacts to be considered in

the ES;

Identify those issues which are likely to require more detailed study and those that can

be justifiably excluded from further assessment; and

Provide a means of identifying the most appropriate methods of impact assessment.

5.1.3 The following topics were identified as those requiring further detailed investigation:

Hydrology and Water Management;

Land Use and Recreation;

Landscape Character;

Visual Amenity (residents, travellers, walkers and other visitors);

Terrestrial Ecology (Habitats and Animals);

Birds;

Aquatic Ecology (including aquatic plants, aquatic invertebrates and amphibians);

Fish;

Cultural heritage;

Noise; and

Traffic.

5.1.4 In addition to these core assessments, a review of national, regional and local planning

policies and plans was undertaken to determine the extent to which the Development would

be in conformity or conflict with statutory plans.



6 LAND USE AND RECREATION

6.1 Land Use

6.1.1 Beyond the areas of forestry and woodland within the vicinity of the Development, most other

land is steeply sloping or at a higher elevation and as such is predominantly moorland. Land

suitable for agriculture, beyond rough grazing, is very limited, however there are a few small

areas of flat land along the valley floor such as the area around Kilfinnan.

6.1.2 The main concentrations of settlement are at Laggan, between Loch Lochy and Loch Oich and

at Invergarry. There are also a small number of properties along the shore of Loch Lochy and

along Glengarry, at Mandally and Faichem.

6.1.3 The main transport routes through the study area are the A82(T) (which runs southwest to

northeast along the Great Glen between Fort William and Inverness) and the A87 (which

initially runs east to west along Glengarry and connects the A82(T) at Invergarry to Kyle of

Lochalsh and the Isle of Skye). The Caledonian Canal is also well used by people travelling by

boat along the Great Glen between Fort William and Inverness.

6.1.4 There are frequent overhead lines in the area, most being low level woodpole lines connecting

to the settlements and scattered properties. There is also a larger overhead line crossing the

study area from the north of Invergarry, to Laggan Locks and down the side of Loch Lochy.

6.2 Recreation

6.2.1 Walking is a popular activity within the area and there are a number of popular trails and

routes, most notably, the Great Glen Way (a long distance route from Fort William to

Inverness). There are also a number of way-marked walking trails in Glengarry Forest as well

as popular routes from Glengarry and Kilfinnan to Ben Tee and the two adjacent Munros

(mountains over 3000ft), Meall Teanga and Sron a Choire Ghairbh.

6.2.2 Cycling is also popular with well used routes including the Great Glen Way and Great Glen

Cycle Route (National Cycle Route 78). Mountain biking occurs, particularly in Glengarry

Forest and other forestry areas.

6.2.3 Other popular activities in the area include fishing (e.g. River Garry, Loch Garry, Loch Lochy

and Loch Oich), and white water canoeing, kayaking and rafting on the River Garry.

6.3 Assessment Summary

6.3.1 The construction of the Development would likely result in the temporary loss of localised

areas of woodland and forestry, moorland and agricultural land, as well as localised impacts to

recreational amenity on some walking and cycling routes. In the vicinity of the lower works, the

existing forestry roads are incorporated in the Great Glen Way. Where appropriate for safety, it

is proposed to provide a new path to run parallel to the existing track to separate walkers and

cyclists from the works, constructed to the same standard as the existing Great Glen Way.

This path would be constructed at commencement of works in the area and it is proposed that

this would remain in place as a permanent diversion to this section of the Great Glen Way.

6.3.2 During operation all impacts would be reduced and there are no long term effects on

recreational resources anticipated as a result of the Development.



7 LANDSCAPE CHARACTER

7.1 Introduction

7.1.1 A landscape character assessment was carried out to assess the extent to which the

Development may affect or change the key characteristics of the landscape of the study area.

7.1.2 The Development would be located on the shore and within the hills to the northwest of Loch

Lochy. This is a landscape of large scale patterns and contrasting high mountain summits,

deep glens and lochs. The predominant feature of the landscape is the Great Glen, a

distinctive steep-sided and flat-bottomed, fjord-like valley, accommodating Lochs Lochy and

Oich, which slices through the mountainous landscape providing a route for transport and

infrastructure and containing much of the settlement within the area.

7.1.3 Much of the lower slopes and the glen sides are clothed in coniferous forestry plantation whilst

the glen floors and fringes of the lochs are commonly colonised with native and deciduous

woodland, interspersed with areas of rough agricultural land. This extent of tree cover

emphasises the strong contrast between the low lying glen and the open, exposed high

mountain slopes, crags and summits.

7.2 Landscape Designations and Landscape Character

7.2.1 The Development falls within the Loch Lochy and Loch Oich Special Landscape Area (SLA).

The Development is not located within a Search Area for Wild Land (SNH Policy No. 02/03),

although the potential for localised areas of wild land does exist.

7.2.2 The landscape character assessment identified nine Local Character Zones (LCZs) where it

was considered that combinations of landform, vegetation, settlement and other features form

a distinct ‘sense of place’.


7.3.1 The assessment concluded that significant impacts to the landscape resource of the study

area would be relatively widespread during the construction of the Development, as a result of

the scale and intensity of the works being undertaken. However, once construction works had

been concluded, and mitigation proposals and reinstatement had been undertaken and

allowed to establish, it is anticipated that this impact would reduce. Although significant

impacts would be expected to continue within the local area surrounding the proposed dam

and reservoir, these would be largely contained within one relatively small LCZ and, it is

anticipated that the long term effects on the wider landscape resource would not be significant.

7.3.2 In terms of the Loch Lochy and Loch Oich SLA, significant impacts are anticipated during

construction. However, in the long term, it is anticipated that impacts would reduce to affect a

comparatively small area around the dam and reservoir. It is not considered that the integrity

of the designation would be affected. Temporary significant impacts to localised areas of wild

land during both construction and operation (reduced to a localised area around the dam only)

are anticipated, however, it is considered that much of the wild land characteristics of the

wider area would remain unaffected in the long term.



8 VISUAL AMENITY

8.1 Introduction

8.1.1 The visual impact assessment describes and evaluates the potential change as a result of the

construction and operation of the Development in views from buildings, routes and popular

viewpoints and the extent to which these affect residents, visitors and users of the landscape.

8.1.2 The dam and reservoir would be located within a steep sided corrie enclosed on three sides

and as such visibility would be limited. There are some small areas of visibility from the

plateau moorland to the south of Invergarry and more distant but widespread visibility from the

higher slopes along the south side of Loch Oich.

8.1.3 At the outlet area on the shore of Loch Lochy it is anticipated that views of construction

activity, as well as the tailrace and administration building would also be limited by topography,

with the majority of views from across Loch Lochy, Laggan and the steep valley sides of the

Great Glen.

8.1.4 The visual impact assessment identified two groups from which views may potentially be

affected. These are:

buildings; and

routes and outdoor locations including public roads, footpaths, walking routes and

mountain summits.


8.2.1 The assessment has identified that five building receptors and eleven route and outdoor

receptors would receive significant impacts during construction. Three additional routes would

receive locally significant impacts during construction.

8.2.2 Once construction has been completed, the level of impact would be reduced and no long

term impacts on building receptors are anticipated. However, seven outdoor receptors would

continue to experience significant impacts during the operation of the Development. These

receptors include the summits of Sron a Choire Ghairbh and Ben Tee and various recognised

footpath routes to their summits. This would be as a result of the close proximity of views of

the dam, reservoir and associated drawdown and the upper access track. A total of four of

these walking routes would experience localised impacts only, which when considering

potential impacts on the route as a whole would not be considered a significant impact.

8.2.3 With the exception of the above mentioned building and outdoor receptors, visual effects

during both construction and operation of the Development from the majority of receptors

would not be considered significant. Therefore the effect upon visual amenity of the study area

when considered as a whole is not considered to be significant.



9 TERRESTRIAL ECOLOGY (VEGETATION)

9.1 Introduction

9.1.1 A full terrestrial ecology survey and vegetation survey was carried out for habitats potentially

affected by the Development, in accordance with standard guidance.

9.1.2 The upper works of the Development would be situated in open areas of moorland in Coire

Glas, consisting of modified heaths and bogs with relatively small patches of acid grassland

and mosaic habitats. At the lower section, beside Loch Lochy, an administration building,

access tunnels and construction compound would be located in the Loch Lochy Forest which

consists of coupes of planted conifers. Along parts of the Loch Lochy shoreline, a narrow

margin contains self-seeded native broadleaves growing amongst conifers. The outlet area

would be located in this zone. The tailrace structure would be close to a small area of semi-

natural woodland at Glas Dhoire on a promontory into the Loch.


9.2.1 The assessment concluded that permanent impacts would include the loss of small quantities

of some terrestrial habitats, but these would be relative to the total amounts of these habitats

found in the local district. As such, both temporary (during construction) and permanent

impacts are not predicted to be significant on these terrestrial habitats with appropriate

mitigation.

9.2.2 Mitigation measures have been designed to prevent, reduce or offset adverse potential

impacts on the terrestrial ecological features found within the vicinity of the Development.

These mitigation measures have been informed from previous assessment experience and

on-going monitoring during the construction of large scale hydroelectric projects in the

Highlands of Scotland, such as Glendoe Hydroelectric Scheme. Mitigation measures would be

monitored through the commissioning of an Ecological Clerk of Works during the construction

phase of the Development. If these mitigation measures are implemented the impacts to

habitats would not be significant.



10 TERRESTRIAL ECOLOGY (ANIMAL SPECIES)

10.1 Introduction

10.1.1 A study has been carried to assess the potential impact of the construction and operation of

the Development to animal species. The assessment has involved:

Consultation with and data from Scottish Natural Heritage (SNH) and data from

Forestry Commission (Scotland);

Site surveys;

Reference to the UK and Lochaber Biodiversity Action Plans; and

Evaluating impacts on habitats and species based on estimated loss or disturbance

during construction and operation, and in consideration of relevant legislation.

10.1.2 During the surveys carried out in 2010 and 2011, the following animals or their signs were

recorded within or adjacent to the survey area: otter, water vole, pine marten, fox, red and roe

deer, and short-tailed voles.


10.2.1 Potential direct impacts on animal, reptile, amphibian and invertebrate species would occur

mostly during construction. Adequate mitigation measures for the conservation of protected

species and other animals would be adopted to minimise disturbance should they be passing

or sheltering in the vicinity of the Development and to minimise loss or damage to their

potential habitats.

10.2.2 Mitigation measures have been informed from previous assessment experience and on-going

monitoring during the construction of large scale hydroelectric projects in the Highlands of

Scotland, such as Glendoe Hydroelectric Scheme. Mitigation measures would be monitored

through the commissioning of an Ecological Clerk of Works during the construction phase of

the Development. If these mitigation measures are implemented the impacts on animal

species are not anticipated to be significant.



11 BIRDS

11.1 Introduction

11.1.1 A programme of bird surveys has been completed to assess the potential impacts of the

Development on bird populations within the vicinity of the proposed works.

11.1.2 The bulk of activity which may have a potential impact on birds would consist of the

construction of the dam and creation of the reservoir, and the building and upgrading of

access tracks. The potential impacts on bird populations during the construction phase would

be loss of habitat and both visual and noise disturbance from the increase in vehicular

movements and human activity on the site.

11.1.3 Operational activity which may have a potential impact on birds consists of the movement of

vehicles and continued human activity, although such activities would be minimal.

11.1.4 A variety of bird species were noted during the bird surveys, and consultation with the Scottish

Raptor Study Group and review of desk-based information confirmed those species present

within the vicinity of the proposed works.


11.2.1 Based on this available data, and as a result of the full implementation of adequate mitigation

procedures, supervised by a suitably qualified ornithologist, it is anticipated that there would

be very few impacts on bird species during the construction phase of the Development and

effects are not considered to be significant.

11.2.2 Once operational, the Development would have little or no impact on bird species within the

area. The frequency and volume of traffic and human activity would be minimal, and would

have dropped considerably from the construction phase, so due to the habituation of species

to disturbance over a period of time, the effects are not considered to be significant.



12 AQUATIC ECOLOGY

12.1 Introduction

12.1.1 An assessment has been carried out to identify potential impacts on aquatic ecology as a

result of the construction and operation of the Development.

12.1.2 The assessment has been informed by a series of surveys which focussed on potential

impacts on habitat loss and fragmentation at the water bodies and courses within the vicinity

of the proposed works, as well as potential impacts on freshwater pearl mussel populations,

macroinvertebrates, bryophytes, sediment transport, water quality, erosion and water level

changes in Loch Lochy.


12.2.1 The assessment concluded that potentially significant negative impacts during construction of

the Development would be limited to permanent habitat loss and fragmentation at Loch a'

Choire Ghlais and Allt a' Choire Ghlais from inundation of the area behind the dam, and

temporary deterioration of water quality in all waterbodies from construction activities.

12.2.2 No mitigation is considered possible for habitat loss and fragmentation. However, effective

mitigation could be put in place to ensure pollution events are kept to a minimum to avoid

deterioration of water quality.

12.2.3 The assessment further concluded that potentially significant negative impacts to

macroinvertebrate and bryophyte communities could result from the Development through

changes in flow and sediment starvation in the upper Allt a' Choire Ghlais and changes in flow

at Kilfinnan Falls.



13 FISH

13.1 Introduction

13.1.1 An assessment has been carried out to identify potential impacts on fish as a result of the

construction and operation of the Development.

13.1.2 The assessment has been informed through consultations with Scottish Environment

Protection Agency (SEPA), Scottish Natural Heritage (SNH), Lochaber District Salmon

Fisheries Board (LDSFB) and Lochaber and District Fisheries Trust (LDFT) regarding the type

and extent of fish surveys required. Within the vicinity of the Development, the finalised scope

of the fish survey work included a fish habitat survey, an electric fishing survey, a survey of the

littoral habitats in Loch a’ Choire Ghlais and a shoreline habitat survey of Loch Lochy.


13.2.1 The assessment concluded that potentially significant negative impacts during construction of

the Development would be limited to permanent habitat loss and fragmentation at Loch a'

Choire Ghlais and Allt a' Choire Ghlais from inundation of the area behind the dam, and

temporary deterioration of water quality in all waterbodies from construction activities. This is

likely to have a negative impact on trout habitat and a brown trout population within the area of

the proposed dam and reservoir.

13.2.2 Effective mitigation could be put in place to ensure pollution events are kept to a minimum to

avoid deterioration of water quality.

13.2.3 The assessment further concluded that no significant effects during operation of the

Development on fish are anticipated.



14 CULTURAL HERITAGE

14.1 Introduction

14.1.1 The cultural heritage assessment considered the likely effects of the construction and

operation of the Development on cultural heritage interests including Scheduled Ancient

Monuments, Listed Buildings, and other archaeological features.

14.1.2 A number of archaeological features with statutory protection have been identified in the

vicinity of the Development. These are two locks at Laggan on the Caledonian Canal which

are designated Scheduled Ancient Monuments and several Category C Listed Buildings.

14.1.3 There are a number of features recorded on the Highland Historic Environment Record within

the general area of the Development, particularly between Loch Lochy and Loch Oich. These

are mostly within the crofting township of Balmaglaster. A site survey has also identified a

number of unrecorded archaeological sites.


14.2.1 Following a desk-based review, site survey and impact assessment it was determined that the

potential impact of the Development on the archaeological record and cultural heritage of the

area would be slight. Only one archaeological site, the Coille an t-Salaich, farmstead would be

directly affected by construction of one of the upper reservoir construction compounds, located

in existing forestry plantation. There may be damage to as yet unlocated minor features

associated with the township of Glas Dhoire, but the township buildings themselves would be

unaffected. The visual impact on the canal and locks would be slight and can be minimised by

good design of the existing track upgrading and the site compound and accommodation areas

associated with the lower reservoir works.

14.2.2 If during the detailed design stage it is considered necessary to include this area in the site

clearance operations, it would be recommended that the area of the former township of Glas-

dhoire be investigated further in order to locate and record minor features associated with the

township, and to ensure that there would be no accidental damage to known township

features.

14.2.3 The Coille an t-Salaich, farmstead, should also be investigated further before felling and

ground clearance work, to ensure that any visible remains of this feature are recorded and

evaluated. Should the site prove to be other than a minor mid-19th century feature, further

investigation may be necessary to ensure the site is properly understood.



15 TRAFFIC AND TRANSPORT

15.1 Introduction

15.1.1 An assessment has been carried out to consider the access arrangements to and from the site

junction off the A87 at White Bridge (Invergarry) (for the upper reservoir works) and the site

junction off the A82 at North Laggan (for the lower reservoir works). The volume of trips

generated by construction traffic during the construction phase is also considered.

15.1.2 The site would be fully developed over a sixty month construction phase. However, the

construction process generating the most Heavy Goods Vehicles (HGV) movements is likely

to be the transportation of excavated rock. It is estimated that this stage of the construction

process could take thirty six months and the majority of traffic movements would be from the

outlet area along the North Laggan road to the A82.


15.2.1 It is estimated that average hourly HGV trip generation would peak at twelve HGV trips per

hour during the period when excavated rock was transported from site. Before and after this

phase of the construction period, average hourly HGV trip generation would reduce to two

HGV trips per hour. While not inconsiderable, it is not considered that this level of traffic

generation would pose any capacity issues to the local road network.

15.2.2 Other (lighter) vehicles that would access the site throughout construction would comprise

cars, vans and 4x4 vehicles and these would average about fourteen per day over the five

year construction period.

15.2.3 To assist in junction visibility at both the A82 and A87 site junctions, mitigation such as

additional signage, vegetation clearance and anti-skid surfacing on the approaches to the

junction would be discussed and agreed with The Highland Council.

15.2.4 During operation, the Development would be manned from the administration building at the

outlet area. It is estimated that an average of twelve staff would be employed at the facility on

a permanent basis, requiring daily access. Infrequent access by heavier vehicles for

maintenance would occur as required.



16 NOISE

16.1 Introduction

16.1.1 An assessment of potential noise and vibration impacts associated with construction activities

of the Development was carried out. Once operational, the turbines and associated electrical

equipment would be located within the underground power station. Furthermore,

approximately twelve staff would access the administration building on a daily basis with

occasional visits to the upper reservoir area for maintenance purposes. As such, the potential

for noise impacts during operation is considered to be minimal.

16.1.2 The focus of the assessment concentrated on those activities associated with the lower

reservoir works, close to the majority of sensitive receptors (e.g. upgrading of access roads,

construction of structures and formation of tunnels). Although the work associated with the

dam would continue over a five year period, it is considered that the noise impact would be

minimal as a result of the distance and nature of the topography (i.e. no direct line of sight)

between sensitive receptors and these construction areas.

16.1.3 Baseline noise levels were obtained by monitoring the actual ambient noise levels

experienced at selected sensitive receptors agreed with The Highland Council’s

Environmental Health Department.


16.2.1 When considering the potential noise levels and durations against the baseline conditions it is

predicted that short term noise impacts would be associated with the upgrade of the minor

road through North Laggan to Kilfinnan and construction of the site establishment and

accommodation area for the lower reservoir works. Longer term impacts are predicted in

relation to construction traffic movements for sensitive receptors along the minor road from

North Laggan to Kilfinnan.

16.2.2 Construction noise and vibration would primarily be managed through consultation with the

Highland Council, Transport, Environmental and Community Services once construction

activities and hours of operation are known. Through this process mitigation measures and

monitoring programmes (if required) would be agreed with the council prior to construction

work commencing.



17 PLANNING POLICY

17.1 Introduction

17.1.1 A review of policies and plans at a national, regional and local level to determine the extent to

which the proposals conform to, or conflict with, relevant documents and commitments has

been carried out.

17.1.2 Scottish Planning Policy (SPP) is the statement of Scottish Government policy on nationally

important land use and other planning matters supported, where appropriate, by a locational

framework. Planning Advisory Notes (PANs) provide advice on good practice and other

relevant information.

17.1.3 At a regional level, guidance and policy is set out in the Highland Structure Plan (2001). This

sets out the broad planning strategy for the Highland area. At a local level, more specific

guidance and policies are set out in the West Highlands and Islands Local Plan (2010). A

review of policies contained within these documents was carried out with respect to the

proposed scheme.

17.1.4 The principal piece of planning legislation relevant to the consent of the Development is The

Electricity Act 1989 (Requirement of Consent for Hydroelectric Generating Stations (Scotland)

Order 1990). Any hydroelectric scheme with a generating capacity of over 50MW falls under

Section 36 of the Act, which states that consent to construct and operate such a scheme must

be obtained from the Scottish Ministers.

17.1.5 The Development is in broad conformity with relevant national, regional and local planning

polices. The proposals could be considered an important subsidiary of the renewables sector

and could provide a valuable contribution to the national energy mix.

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