Guilbaud, JJS; (2016) Hybrid Renewable Power Systems for the Mining Industry: System Costs, Reliability Costs, and Portfolio Cost Risks. Doctoral thesis , UCL (University College London).

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Abstract

The mineral sector is responsible for more than 38% of total industrial energy use and 11% of total final energy consumption. A rising trend in the industry is the search for cleaner, less carbon-intensive and more efficient energy technologies that can also bring new business opportunities to the industry. Evidence suggests that the inclusion of energy storage and renewables alongside traditional fuel-based power alternatives can both reduce generation costs and carbon emissions in off-grid and distributed power systems. Previous research has quantified this outcome for other industrial and domestic sectors but little investigation has taken place to characterise the potential of hybrid systems in mining settings. The interest of this research is to assess the economic potential of hybrid renewable systems and evaluate the trade-offs associated with the context-dependent factors of the mining industry. An energy optimisation model, named HELiOS-Mining, was developed in order to account for these factors, and search for the least-cost generation alternatives in relation to technical characteristics (i.e. storage strategies, dispatch, demand-shifting, reliability requirements, fuel-mix), economic specificities (i.e. value of lost load, portfolio cost risk, financing), and spatial factors (i.e. access to resources, climate). Three major mining regions are investigated, including: grid-connected and off-grid mining in Northern Chile as well as off-grid mining in North-Western Australia and Yukon, Canada. The results of this research allow important insights to be made into the economics of hybridised power systems in mining settings. Research findings have identified that hybrid renewable power systems can generate life-cycle cost savings of up to 57% and carbon savings of up to 82% (against diesel or grid power baselines). Power systems that feature a renewable penetration of 60 to 85% of total capacity have the lowest costs in three out of four selected mines. Furthermore, portfolio analysis has demonstrated that such power systems can help reducing the cost risk of the industry associated with fuel price variations and carbon policies. Results also illustrate how assumptions about risk factors can drive large shifts in optima, and that concentrated solar power could be a key enabling technology for reducing the emissions of the mining industry.

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