Reading: Optimal Electricity Generation Expansion to Achieve Non-Conventional Renewable Energy Targets


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Optimal Electricity Generation Expansion to Achieve Non-Conventional Renewable Energy Targets


W. D. Prasad ,

University of Moratuwa, LK
About W. D.

Research Assistant, Department of Electrical Engineering

AMIE (SL), BSc Eng. (Hons) (Moratuwa)

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Priyantha D. C. Wijayatunga

Public Utilities Commission, LK
About Priyantha D. C.

Director General, Professor in Electrical Engineering, University of Moratuwa

C. Eng., MIE (SL), Senior Member IEEE, MIET, BSc Eng. (Hons) (Moratuwa), PhD (London), DIC

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Renewable Portfolio Standard (RPS) is rapidly emerging as a popular mechanism among policy makers to increase the penetration of renewable in the electricity markets, requiring the electricity supply industry to include a minimum threshold level of electricity generation from renewable energy sources. Sri Lankan energy policy has set a target of 10% of grid electricity by 2015 to come from mini-hydro, biomass including dendro power and wind energy, which have been identified as the three leading, sustainable, non-conventional forms of renewable energy promoted in Sri Lanka for electricity generation to feed into the national grid.


The present installed capacity of grid-connected non-conventional renewable energy based electricity generation in Sri Lanka is around 100 MW and these plants are mainly connected to the primary distribution system. All these plants contribute to the nation's energy requirement generating only a small fraction of total generation amounting to approximately 2.5%. Further the long-term least-cost power generation expansion plan has given rise to the installation of oil-fired and coal-fired thermal plants to meet the increasing demand without giving adequate consideration to the non-conventional technologies as supply-side options.


The study presented in this paper investigates the impact of the RPS of 10% on the least-cost power generation expansion plan considering aforementioned renewable technologies as supply-side options together with their technical potential and economic feasibility. The paper also examines the impact on emissions with this new renewable energy policy. It has been determined that this target can be achieved with an additional cost of US$ 93.18 million on the government by 2015. The results also show that mini-hydro is the only mature non-conventional technology. Wind power and dendro power require substantial government subsidies if they are to play a role in RPS.

How to Cite: Prasad, W.D. and Wijayatunga, P.D.C., 2007. Optimal Electricity Generation Expansion to Achieve Non-Conventional Renewable Energy Targets. Engineer: Journal of the Institution of Engineers, Sri Lanka, 40(4), pp.160–166. DOI:
Published on 30 Oct 2007.
Peer Reviewed


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