Barr River Hydropower Scheme John Heaton Review of Achadh Forsa and - - PowerPoint PPT Presentation

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Barr River Hydropower Scheme John Heaton Review of Achadh Forsa and - - PowerPoint PPT Presentation

Mar 29, 2023 46 likes •208 views

Barr River Hydropower Scheme John Heaton Review of Achadh Forsa and Barr River Achadh Forsa Poor financial returns Decided not to progress Review of Achadh Forsa and Barr River Barr River Potentially viable Some design

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Barr River Hydropower Scheme

John Heaton

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  • Achadh Forsa

– Poor financial returns – Decided not to progress

Review of Achadh Forsa and Barr River

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  • Barr River

– Potentially viable – Some design improvements required – Construction costs to be reduced

Review of Achadh Forsa and Barr River

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  • Refinement of design
  • Modelling and optioneering
  • Outline design
  • Consents

Barr River progress

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  • Intake arrangement

– Intake locations – Number and style of intakes

  • Pipeline route
  • Grid connection

– Location – Cable route – Capacity

Barr River design review

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  • Cost/benefit

analysis

– Intake locations and levels – Turbine house location – Grid connection

Barr River options appraisal

Scenario Higher 2-2 exc MN1 Higher 2-3 inc MN1 Intake arrangement Turbine house location Grid connection Hydrology - FDC source Hydroplan (P50) Hydroplan (P50) Hydroplan (P50) Hydroplan (P50) Hydroplan (P50) Hydroplan (P50) Hydroplan (P50) Intake level (mAOD) 150 149 149 154 149 149 149 Turbine level (mAOD) 11 12 12 12 12 12 36 Gross head (m) 139 137 137 142 137 137 113 Design flow (l/s) 1,406 1,422 1,422 1,433 1,422 1,422 1,442 Turbine type Pelton Hydrohrom 5-jet PeltonHydrohrom 5-jet PeltonHydrohrom 5-jet PeltonHydrohrom 5-jet PeltonHydrohrom 5-jet PeltonHydrohrom 5-jet Pelton Power (kW) 1,510 1,525 1,575 1,595 1,525 1,580 1,275 Gross energy (MWh/yr) 5,197 5,305 5,360 5,116 5,307 4,285 Gross capacity factor 33% 39% 38% 38% 38% 38% 38% Plant availability 95% 95% 95% 95% 95% 95% Parasitic load & losses 4% 4% 4% 4% 4% 4% Electricity sold to grid 100% 100% 100% 100% 100% 100% 100% Net energy that earns FIT 4,365 4,937 5,040 5,092 4,860 5,041 4,070 Net energy that earns PPA 4,365 4,740 4,838 4,888 4,665 4,840 3,908 Net energy that earns local revenue

  • FIT rate, p/kWh

6.46 6.46 6.46 6.46 6.46 6.46 PPA rate, p/kWh 5.00 5.00 5.00 5.00 5.00 5.00 Rate for local supply, p/kWh

  • FIT revenue

£318,940 £325,568 £328,931 £313,938 £325,666 £262,946 Local supply revenue £0 £0 £0 £0 £0 £0 Export revenue £236,983 £241,908 £244,407 £233,267 £241,981 £195,378 Gross revenue £555,923 £567,476 £573,338 £547,205 £567,647 £458,324 Rent £25,000 £44,474 £45,398 £45,867 £43,776 £45,412 £36,666 Operating costs £51,000 £49,840 £49,840 £49,840 £49,840 £49,840 £49,840 Net revenue £417,245 £461,609 £472,238 £477,631 £453,589 £472,395 £371,818 Best case Worst case Worst case Worst case Worst case Worst case Worst case £5,615,000 £4,587,350 £4,616,709 £4,643,700 £4,502,020 £4,648,932 £4,167,350 Best case Comparitive Comparitive Comparitive Comparitive Comparitive Comparitive 7.4% 10.1% 10.2% 10.3% 10.1% 10.2% 8.9% Intake 2-1 trib Below gorge As per Hydroplan Near waterfall BASELINE - Hydroplan figure Close to Garbh Dhoire CAPEX ROI BASELINE - GHC figures Higher turbine house 11.30 £493,245

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Barr River outline design

Item Description Intakes 3 ‘main’ intakes – relatively large reinforced concrete 8 small intakes – small pre-fabricated Pipeline 1.5km ‘gravity’ pipeline – plastic, up to 500mm diameter 1.7km ‘pressure’ pipeline branches – plastic, 630 to 900mm diameter 1.2km ‘pressure’ common pipeline – GRP or ductile iron – up to 1m dia. Turbine Vertical axis Pelton, Crossflow or Turgo, up to 1.75MW Powerhouse Steel portal frame, timber clad, slate-coloured roof 11m x 8m in plan, up to 8m tall Outfall Reinforced concrete structure built into river bank

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Intakes

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Pipeline

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Turbines

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Powerhouse

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Barr River modelling results

Item Value Head 153m Flow Up to 1.5m3/s Power Up to 1.75MW, likely to be 1.65MW Energy Approximately 5GWh/year Revenue sources Feed in tariff @ 6.46p/kWh Power export @ 5-7p/kWh Operating costs Maintenance and rent Net revenue Approximately £500k/year (before debt payments) Construction cost £4.5-5million (excluding development, finance & legals)

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  • CAR licence

– Impoundments – Abstractions

  • Planning
  • Forestry

Commission

Barr River consents – secured

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Environmental constraints

  • Impact on watercourses
  • Cultural heritage
  • Protected species
  • Recreation
  • Transport
  • Trees
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Priorities during construction

  • Sediment management

(pollution control)

  • Protection of archaeology
  • Ground preparation and

reinstatement

  • Tree protection
  • Protected species

mitigations

  • Traffic management
  • Maintaining public access

and safety

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Status and next steps

  • Feed in Tariff preliminary accreditation
  • Procurement
  • Refine budget
  • Detailed design
  • Complete consents process
  • Secure finance and legals