Parametric vs. Non-Parametric Efficiency Assessment: Case of Power Plants in Turkey

Year 2017, Volume: 22 Issue: 3, 21 - 42, 08.12.2017

Kemal Sarıca

https://doi.org/10.17482/uumfd.364087

Abstract

Throughout the study, the operational and long term investment
performances of various power plants in Turkey are assessed and compared using Stochastic
Frontier Analysis (SFA) and Data
Envelopment Analysis (DEA). The data set is composed of 65 thermal, hydro and
wind power plants with private and public ownership. Efficiency indices,
reflecting operational and investment performance, are described and elaborated.
Returns to scale, (constant and variable), assurance region, slack based
measure, system comparison and bilateral type DEA models as well as stochastic
frontier analysis employing the Cobb-Douglas and Translog production functions are
used in the analysis. An analysis of returns to scale is carried out. The
properties of the production frontiers are described for all efficiency
indices. Public-private sector plants, renewable-thermal plants as well as
natural gas-coal versus oil fired plants are compared according to their efficiency
performance values. Efficiency scores obtained from DEA and SFA are compared and some relationships are
identified. Interesting relationship are identified by elaborating the efficiency
indices and various input/output factors. Even though natural gas fired power
plants outperforms the coal fired ones in terms of investment efficiency, in
general, reverse is true for operational performance under variable returns to
scale.

Keywords

Efficiency, Stochastic Frontier Analysis, Data Envelopment Analysis, Energy Systems Planning

PARAMETRİK VE PARAMETRİK OLMAYAN VERİMLİLİK DEĞERLENDİRMESİ VE KARŞILAŞTIRILMASI: TÜRKİYE ELEKTRİK SANTRALLERİ ÖRNEĞİ

Abstract

Çalışma
boyunca Türkiye’deki çeşitli enerji santrallerinin operasyonel ve uzun vadeli
yatırım performansları Stokastik Sınır Analiz (SSA) ve Veri Zarflama Analizi
(VZA) kullanılarak karşılaştırıldı. Veri kümesi, özel ve kamu mülkiyetindeki 65
termal, hidroelektrik ve rüzgâr enerji santrallerinden oluşturuldu. Operasyonel
ve yatırım performansını yansıtan verimlilik endeksleri ortaya konup incelendi.
Analizde ölçek, sabit ve değişken, güvence bölgesi, gevşek tabanlı ölçüm,
sistem karşılaştırma ve bilateral tip DEA modelleri ile Cobb-Douglas ve
Translog üretim fonksiyonlarını kullanan stokastik sınır analizi kullanıldı.
Ölçek getirisinin analizine yönelik VZA ve SSA modellerinin ortaya koyduğu tüm
indisler kullanılarak değerlendirmeler yapıldı. Kamu-özel, termal-yenilenebilir
karşılaştırmalarının yanı sıra doğal gaz-kömür-petrol santralleri verimlilik
performans değerlerine göre karşılaştırıldı. VZA ve SSA metotlarından elde
edilen sonuçlar karşılaştırıldı. İlginç verimlilik endeksi ve çeşitli
giriş/çıkış faktörleri arasında ilişkiler ortaya kondu ve değerlendirildi. Doğal gazla çalışan elektrik santralleri, yatırım verimliliği
açısından kömürle çalışan santrallerden daha iyi performans gösterse de,
değişken getiri oranlarına göre operasyonel performansı için tersi geçerlidir.

Keywords

Verimlilik, Stokastik Sınır Analizi, Veri Zarflama Analizi, Enerji Sistem Planlama

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