Barr River Hydropower Scheme · 2019-04-02 · Turbine Vertical axis Pelton, Crossflow or Turgo, up...
Transcript of Barr River Hydropower Scheme · 2019-04-02 · Turbine Vertical axis Pelton, Crossflow or Turgo, up...
Barr River Hydropower Scheme
John Heaton
• 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
Review of Achadh Forsa and Barr River
• Refinement of design
• Modelling and optioneering
• Outline design
• Consents
Barr River progress
• Intake arrangement – Intake locations – Number and style of
intakes
• Pipeline route • Grid connection
– Location – Cable route – Capacity
Barr River design review
• 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 figures
Close to Garbh Dhoire
CAPEX
ROI
BASELINE - GHC figures Higher turbine house
11.30
£493,245
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
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)
• CAR licence
– Impoundments
– Abstractions
• Planning
• Forestry Commission
Barr River consents – secured
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