Ullapool Run-of-River Hydro Project

A comprehensive feasibility study for a 935kW mini hydro installation in the Scottish Highlands

Project Overview

In 2024, Apex Bridge Energy conducted a comprehensive feasibility study for a run-of-river hydro power station near Ullapool, Scotland. The study analyzed eight key areas to determine the project's viability, including hydrology, civil works, turbine specifications, and economic feasibility.

Technical Specifications

  • Catchment Area: 30.1m²
  • Design Flow: ~2m³/s
  • Gross Head: 58m
  • Net Head: 55.1m
  • Penstock Length: 465m

Power Generation

  • Capacity: 935kW
  • Turbine: High Speed Francis
  • Generator: SDGB 4502-4 1500rpm
  • Transmission: 11kV Overhead line
  • Annual Production: 2,885.05 MWh

Economic Analysis

  • Capital Cost: £808,812.66
  • Net Present Value: £941,021.66
  • LCOE: £0.0782/kWh
  • Payback Period: 9.12 years
  • ROI: 16.3%

Project Journey

Phase 1: Site Assessment

Initial evaluation and planning:

  • Regional hydrology analysis
  • Available head assessment (58m)
  • Environmental impact evaluation
  • Grid connection feasibility study

Phase 2: Technical Design

Engineering and optimization:

  • Civil works specification
  • Turbine selection and sizing
  • Electrical system design
  • Water management system

Phase 3: Economic Analysis

Financial and social impact assessment:

  • Capital cost analysis
  • Energy production modeling
  • Financial viability assessment
  • Environmental impact mitigation

Key Learnings

This project has demonstrated several important insights for future mini hydro developments in Scotland:

  • Critical importance of accurate hydrological assessment in Scottish Highland conditions
  • Value of careful turbine selection for optimal energy production
  • Significance of environmental impact mitigation in sensitive ecosystems
  • Importance of grid connection planning in remote locations

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