electricity production, natural gas, combined cycle power plant, UPR, ecoinvent 3.6, Undefined

ISIC4 categories:
D:Electricity, gas, steam and air conditioning supply/35:Electricity, gas, steam and air conditioning supply/351:Electric power generation, transmission and distribution/3510:Electric power generation, transmission and distribution
Reference year: 2000 - 2015

Location: CN-HN - China, Hunan (湖南)
This dataset represents the production of high voltage electricity in a combined cycle natural gas power plant without CHP (combined heat and power) in China - Hunan in 2012.
['text', 'In a combined cycle power plant, a gas turbine is followed by a steam turbine. The dataset refers to a combined cycle power plant of 400MWe class with a gas turbine 260MWe and a steam turbine 140MWe.']
['text', 'For electricity production with natural gas, four different datasets relying to different power plant types exist:']
['text', ' - conventional power plant with / without CHP']
['text', ' - combined cycle power plant with / without CHP']
['text', 'At the moment, these datasets differ in nothing but the efficiency. High voltage electricity (at the busbar) is the reference product, whereupon heat is a by-product in CHP plants. Out of all fossile fuels, natural gas holds worldwide the highest share of CHP plants besides peat. Furthermore, natural gas power plants are today often designed with combined cycles. The advantages of a combined cycle power plant are for example: ']
['text', ' - a higher efficiency (approximately between 50-60% compared to ca. 33% for a conventional power plant)']
['text', ' - high operating flexibility']
['text', ' - lower emissions due to higher efficiency']
['text', ' - lower cooling water need. ']
['text', 'The approximate share of combined cycle natural gas power plants in China - Hunan amounts to ca. None. None combined heat power plants (calculations made with IEA/OECD statistics and own assumptions). ']
['text', 'The efficiency calculations are based on IEA/OECD statistics (fuel inputs, electricity produced) and some own calculation assumptions. . Reducing factors such as contaminations of important plant parts, cooling conditions or part load have been taken into account. Even if efficiencies vary with different surrounding temperatures, a medium efficiency is assumed for all countries. Temperature adjustments would be related to high uncertainties.']
['text', 'Water is used for wet cooling and as feed water in the steam circuit. In this dataset, 100% wet cooling and no once-through cooling is assumed. ']
['text', 'EMISSIONS:']
['text', 'Different sources served as basis for assumption of average emissions. Where possible, the most recent sources were taken into account, whereas older sources were taken in order to determine the remaining data gaps. The emissions have been fixed for the former UCTE region* and have been overtaken as such for all countries without value adaptation (adaptation of the uncertainty). See ecoinvent report 'Erdgas' given as main source for details (Tab. 11.15). In the following a short overview:']
['text', ' - Emissions of NOx, CO, CO2, SO2, particles, N2O and CH4 are mainly taken from CORINAIR 2001, EPA, and a variety of other data sources ']
['text', '-\tNOx emissions are a major challenge in natural gas power plants. With rising temperature, emissions also rise; band widths of NOx emissions in literature are correspondingly large. There are several methods to diminish these emissions.']
['text', '-\tCO is a result of uncomplete burning. For economic and technical reasons, plant combustion is optimized and CO emissions are low. ']
['text', '-\tCO2 and SO2 emissions are dependent on the composition of the used fuel. Due to the low sulfur content of the used natural gas, no desulfurization has to take place.']
['text', '-\tOrganic compound emissions are estimated on the basis of EPA 1998. ']
['text', '-\tParticles are assumed to be smaller than 2.5 micro-m']
['text', 'former UCTE: Union for the Coordination of the Transmission of Electricity, since 2009 replaced by ENTSO-E European Network of Transmission System Operators for Electricity.']
['text', 'Sources:']
['text', '-\tCORINAIR 2001. EMEP/CORINAIR 2001: Joint EMEP/CORINAIR Atmospheric Emission Inventory Guidebook, Third Edition. Copenhagen: European Environment Agency, 2001. http://reports.eea.eu.int/technical_report_2001_3/en.']
['text', '-\tEPA 1998. US Environmental Protection Agency (1998). Compilation of Air Pollutant Emission Factors, AP-42, Fifth Edition, Volume I: Chapter 1: External Combustion Sources, Natural Gas Combustion - Final Section - Supplement D , July 1998. CHIEF (Clearinghouse for Inventories and Emission Factors). Research Triangle Park, North Carolina. http://www.epa.gov/ttn/chief/ap42/.']
['text', '-\tRentz O., Karl U., Peter H. (2002). Ermittlung und Evaluierung von Emissionsfaktoren f\xfcr Feuerungsanlagen in Deutschland f\xfcr die Jahre 1995, 2000 und 2010. Deutsch- Franz\xf6sisches Institut f\xfcr Umweltforschung, Uni Karsruhe. Endbericht. Im Auftrag des Umweltbundesamtes. Forschungsbericht 299 43 142. Umweltbundesamt. Berlin.']
Undefined unit processes (UPRs) are the unlinked, multi-product activity datasets that form the basis for all of the system models available in the ecoinvent database. This is the way the datasets are obtained and entered into the database by the data providers. These activity datasets are useful for investigating the environmental impacts of a specific activity (gate-to-gate), without regard to its upstream or downstream impacts.


Combined cycle power plant of 400MWe class with a gas turbine 265MWe and a steam turbine 140MWe. The plant is used for middle load with 5000 hours of operation at full capacity per year. The plant is assumed to operate 180000 hours during its lifetime.

Process type
Supported nomenclature
ecoinvent 3.6
LCI modeling approach
Before modeling
Multifunctional modeling
Aggregation type
Data provider
Review status
For sale

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