Each year the U.S. Department of Energy (DOE) Office of Fossil Energy (FE) and the National Energy Technology Laboratory (NETL) conduct dozens of energy system studies. Some of these studies are conducted by federal employees and others are conducted under contracts funded and managed by NETL or FE. It is useful to compare results of these studies that feature similar energy systems. Unfortunately, conducting fair and rational comparisons is often complicated by the lack of consistent modeling assumptions. In an effort to provide more consistency between studies, “Quality Guidelines for Energy Systems Studies” (QGESS) documents are developed.
These documents summarize the methodology employed by NETL in its assessment of power plant performance. A clear understanding of the methodology used is essential for allowing different power plant technologies to be compared on a similar basis. Though these guidelines are tailored for power plants, they can also be applied to a variety of different energy conversion plants (e.g. , coal to liquids, syngas generation, hydrogen).
This page provides abstract and links to the QGESS documents as well as links to related documents with similar objectives.
QUALITY GUIDELINES FOR ENERGY SYSTEM STUDIES FOR FOSSIL ENERGY PLANTS
- QGESS: Retrofit Difficulty Factors, August 2013, DOE/NETL-341/082313
The QGESS: Retrofit Difficulty Factors [PDF-552KB] provides a methodology for estimating additional costs for retrofitting carbon capture technologies onto existing fossil power plants.
- QGESS: Technology Learning Curve, August 2013, DOE/NETL-341/081213
The QGESS: Technology Learning Curve [PDF-491KB], provides a methodology for estimating Nth of a kind plant costs from first of a kind plant costs.
- QGESS: Cost Estimation Methodology for NETL Assessments of Power Plant Performance, April 2011, DOE/NETL-2011/1455
The QGESS: Cost Estimation Methodology for NETL Assessments of Power Plant Performance [PDF-666KB], summarizes the cost estimation methodology employed by NETL in its assessment of power plant performance. A clear understanding of the methodology used is essential for allowing different power plant technologies to be compared on a similar basis. Though these guidelines are tailored for power plants, they can also be applied to a variety of different energy conversion plants (e.g. , coal to liquids, syngas generation, hydrogen).
- QGESS: Estimating Carbon Dioxide Transport and Storage Costs, March 2013, DOE/NETL-2013/1614
The QGESS: Estimating Carbon Dioxide Transport and Storage Costs [PDF-707 KB], estimates the cost of CO2 transport and storage (T&S) in a deep saline aquifer for plant locations used in the energy system studies sponsored by NETL. Due to the variances in the geologic formations that make up saline aquifers across the United States, the cost to store CO2 can vary greatly depending on location. To account for these variances, region-specific results from NETL’s CO2 Saline Storage Cost Model are utilized to represent costs for plant locations used in NETL studies: Midwest, Texas, North Dakota, and Montana. Transport costs are calculated based on a generic 100 km (62 mi) dedicated pipeline for all regions. Storage and monitoring costs represent significant storage potential (up to 25 billion tonnes of CO2) in local sedimentary basins.
- QGESS: Specifications for Selected Feedstocks, March 2012, NETL/DOE -341/011812
The QGESS: Specifications for Selected Feedstocks [PDF-269KB], provides recommended specifications for various feedstocks that are commonly found in NETL-sponsored energy system studies. Adhering to these specifications should enhance the consistency of such studies. NETL recommends these guidelines be followed in the absence of any compelling market, project, or site-specific requirements in order to facilitate comparison of studies evaluating coal-based technologies.
- QGESS: Process Modeling Design Parameters, November 2012, NETL/DOE -341/081911
The QGESS: Process Modeling Design Parameters [PDF - 419KB], documents the process modeling assumptions most commonly used in systems analysis studies and the basis for those assumptions. The large number of assumptions required for a systems analysis makes it impractical to document the entire set in each report. This document will serve as a comprehensive reference for these assumptions as well as their justification.
- QGESS: CO2 Impurity Design Parameter, August 2013, NETL/DOE -341/011212
The QGESS: CO2 Impurity Design Parameters [PDF-358KB], provides recommended impurity limits for CO2stream components for use in conceptual studies of CO2 carbon capture, utilization, and storage systems. These limits were developed from information consolidated from numerous studies and are presented by component. Impurity levels are provided for limitations of carbon steel pipelines, enhanced oil recovery (EOR), saline reservoir sequestration, and cosequestration of CO2 and H2S in saline reservoirs.
- QGESS: Fuel Prices for Selected Feedstocks in NETL Studies, November 2012, DOE/NETL-341/11212
The QGESS:Fuel Prices for Selected Feedstocks in NETL Studies [PDF-738 KB] provides an estimate of the market price delivered to specific end-use areas, of four coals that are commonly used as feedstocks in the energy system studies sponsored by NETL. Also included is the estimated market price for natural gas delivered to three different regions.
- QGESS: Capital Cost Scaling Methodology, January 2013, DOE/NETL-341/013113
The QGESS: Capital Cost Scaling Methodology [PDF-1.10MB], provides a standard basis for scaling capital costs, with specific emphasis on scaling exponents. The intention of having a standardized document is to provide guidelines for proper procedures to reduce the potential of errors and increase credibility through consistency. This document contains a listing of frequently used pieces of equipment and their corresponding scaling exponent for various plant types, along with their ranges of applicability. This document also details the equations to be used with each exponent.
- QGESS: Methane Emissions from Mining Illinois Basin Coals, September 2010, DOE/NETL-400/2010/1445
The QGESS: Methane Emissions for Mining Illinois Basin Coals [PDF-330 KB], explores methane content and emissions associated with mining Illinois Basin coals such as Illinois No. 6. Both coal methane content and specific emissions from mining are explored. Methane emissions resulting from the release of methane trapped in coal beds can have a significant impact on the life cycle greenhouse gas (GHG) emissions associated with coal production. These emissions vary dramatically by coal rank, specific seam, and seam depth and thickness.
RELATED DOCUMENTS FOR QUALITY GUIDELINES FOR ENERGY SYSTEM STUDIES
- QGESS: Detailed Coal Specifications, January 2012, NETL/DOE -401/012111
The QGESS: Detailed Coal Specifications [PDF-1.30MB], provides data on the coal industry and detailed specifications for seven coals commonly used in energy system studies for NETL.
- "A Proposed Methodology for CO2 Capture and Storage Cost Estimates", September 2013
This paper recommends a path forward to improve and systematize the estimation and communications of carbon capture and storage (CCS) costs. The paper resulted from a series of CCS Cost Workshops that were attended by representatives from several international stakeholder organizations, including DOE/NETL.