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

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 improvements required – Construction costs to be reduced

Barr River progress • Refinement of design • Modelling and optioneering • Outline design • Consents

Barr River design review • Intake arrangement – Intake locations – Number and style of intakes • Pipeline route • Grid connection – Location – Cable route – Capacity

Barr River options appraisal • Cost/benefit Scenario BASELINE - Hydroplan figure BASELINE - GHC figures Intake 2-1 trib Higher 2-2 exc MN1 Higher 2-3 inc MN1 Higher turbine house Intake arrangement As per Hydroplan Turbine house location Near waterfall Below gorge Grid connection Close to Garbh Dhoire 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 analysis 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 – Intake locations 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 and levels 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 11.30 PPA rate, p/kWh 5.00 5.00 5.00 5.00 5.00 5.00 Rate for local supply, p/kWh - - - - - - - – Turbine house FIT revenue £318,940 £325,568 £328,931 £313,938 £325,666 £262,946 Local supply revenue £0 £0 £0 £0 £0 £0 £493,245 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 location 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 CAPEX £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 ROI 7.4% 10.1% 10.2% 10.3% 10.1% 10.2% 8.9% – Grid connection

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

Intakes

Pipeline

Turbines

Powerhouse

Barr River modelling results Item Value Head 153m Up to 1.5m 3 /s Flow 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)

Barr River consents – secured • CAR licence – Impoundments – Abstractions • Planning • Forestry Commission

Environmental constraints • Impact on watercourses • Cultural heritage • Protected species • Recreation • Transport • Trees

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

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