Eastern Renewable Generation Integration Study: Initial Results (Poster) Page: 1 of 1
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About the Study
The Eastern Renewable Generation Integration Study (ERGIS) aims to answer critical questions about the
future of the Eastern Interconnection (El) under high levels of solar and wind penetration. The study is
developing a robust production cost simulation database with detailed subhourly data on solar, wind, and
thermal plants, and load. ERGIS uses an advanced production-cost model (PLEXOS) at a subhourly time
resolution to understand the impact of 30% solar and wind penetration on ancillary services, interchange,
and net load. ERGIS will address the following questions:
- What does the variability and uncertainty of net load look like under high penetrations of solar and wind
power?
- How could unit commitment and dispatch change under high penetrations of renewables?
- Are there any operational strategies that could be used to minimize the cost of integrating high
penetrations of solar and wind?
- What are the regional impacts of high solar and wind penetrations?
Technical Review Committee
NREL worked with the Departmnit of Enrergy to brfng togeTher iP.duistry experts for a technICal review
committee to aid in the development of necessary data sets and analyze results as they become available.
In 2013, the committee oversaw the development of several aspects of the project, including:
- Scenario Development
- Thermal Fleet Expansion
- Transmission Expansion
- Solar Profile Development
- Canadian System Modeling
Solar Profile Development
ERGIS scenaros include up to 10% solar penetration in the El and up to 30% solar penetration in certain
regions of the El. These penetrations require subhourly solar generation profiles for a large amount of
installed solar capacity in the El, which did not previously exist. ERGIS uses a method previously
developed at NREL to create realistic solar power profiles from satellite images. The key characteristics for
the solar data set are:
- Appropriate number and size of ramps at each location
- Appropriate coincidence of ramps at closely clustered locations
Appropriate ramps in the surm of solar power throughout a region
Figure 2: The solar profile development algorithm produces statistically probable correlations between
solar sites at different locations and under different time scales.180 min r2 = 086
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5 Solar Generation
QWind Generation
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ieFigure 1: This map shows the assumed structure of the El in the study year. The pie chart slices indicate the
relative amount of solar, wind, and other generation in each region, and the relative size of the pie charts
indicates the amount of generation in each region for the Regional 30% Scenario.
Operational Impacts
ERGIS will evaluate the effeCtiveness of different operational srategfes fPat could be ued tf rinniize the
cost of integrating high penetrations of solar and wind, such as:
New or modified ancillary services products
- Increased sharing of ancillary services between regions
. Faster unit commitment and dispatch cycles
" More frequent interchange scheduling
Figure 3: These graphs show normalized solar and wind generation and net load shapes for (left) the entire
U.S. El and (right) FRCC for (top) the peak coincident load day and (bottom) a high solar generation day.
Operating the conventional generators to meet the net load for the whole El appears reasonable, but certain
regions could have challenging issues that would likely require operational changes from current practices,
as illustrated by the large ramps in the FRCC net load.Whole U.S. Eastern Interconnection
m Net Load -
rs Wind
mO Solar iScenarios
ERGIS is considering four scenarios designed to evaluate the impact of different solar and wind
penetrations. The scenarios represent current-day levels, future levels dictated by current state renewable
portfolio standards (RPS), and high (30%) penetrations of solar and wind. The National 30% Scenario
requires the U.S. portion of the El to serve 30% of its annual load with solar and wind, using the best solar
and wind resources in the El. The Regional 30% Scenario requires each individual region to serve 30% of its
annual load with solar and wind within its geographmr boundaries, with the exception of SERC, which is
allowed to import wart f oft reariramrnf frn S7 .Energy Solar PV
Penetration (%) Capacity (GW)Solar
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12
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96
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2
123
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Capacity (GW)
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30 0
91 15
168 46
237 27Conventional
Capacity (GW)Nuclear
88
88
88
88Coal
231
230
212
216CC
147
144
133
137CT &
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194
197
173
178Peak
Coincident
Load
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Day1 3 5 7 9 11 13 15 17 19 21 23
Hour of Daym Net Load
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Hour of Day
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Regional 30%
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nformation contained inthbis poster is suble[ to a government lcense
Chrcego, Illnors
OcTOber 21-24, 2613[NO DE-AC3fi-68GC
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Bloom, A.; Townsend, A.; Hummon, M.; Weekley, A.; Clark, K. & King, J. Eastern Renewable Generation Integration Study: Initial Results (Poster), article, October 1, 2013; Golden, Colorado. (https://digital.library.unt.edu/ark:/67531/metadc869447/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.