Eastern Wind Integration and Transmission Study Overview

Eastern Wind Integration and Transmission Study Overview

May 2010

Renewable Technology Integration

Integrating 20% Wind – EWITS Goals and Approach• Evaluate the power system

operating impacts and transmission associated with increasing wind energy to 20% and 30%• Impacts include operating

due to variability and uncertainty of wind; reliability

• Build upon prior wind integration studies and related technical work;

• Coordinate with current regional power system study work;

• Produce meaningful, broadly supported results• Technical Review Committee


Technical Review Committee

New York Independent System Operator (NYISO)Xcel EnergySouthern CompanyPJM InterconnectionSouthwest Power Pool(SPP)U.S. Department of Energy Midwest ISO (MISO)Michigan Public Service CommissionArea Power Pool (MAPP)American Wind Energy Association (AWEA)

Federal Energy Regulatory Commission (FERC) – observer statusNorth American Electric Reliability Corporation (NERC)CapX 2020 (Great River Energy)WindlogicsNational Renewable Energy LabGeneral Electric (GE)Regulatory Assistance ProjectUniversity College DublinOrganization of MISO States (Wisconsin Public Service Commission)


The Technical Work Conducted in EWITS Yielded Detailed Quantitative Information on • Wind generation required to produce 20% and 30%

of the projected electric energy demand over the U.S. portion of the Eastern Interconnection in 2024

• Transmission concepts for delivering energy economically for each scenario

• Economic sensitivity simulations of the hourly operation of the power system defined by a wind generation forecast scenario and the associated transmission overlay

• The contribution made by wind generation to resource adequacy and planning capacity margin


Key Tasks

• Wind plant modeling, data development, and Siting– Develop high quality wind resource data sets for

the wind integration study area– Develop wind power plant outputs– Identify wind sites and develop siting scenarios

• Transmission study – Develop transmission concepts for different wind scenarios

• Wind integration study– Evaluate operating impacts– Evaluate resource adequacy – Compare scenario costs


Key Tasks - Mesoscale Modeling

– Develop high quality wind resource data sets for the wind integration study area• Mesoscale modeling• 3 years of time series data (2004-2006)• 10-minute data at 2 km spatial resolution

– Identify wind sites – Develop wind power plant outputs


Mesoscale Grids


579 GWs of Wind Sites from Wind Site Selection process for EWITS


Scenario Development and Siting• Four Different Scenarios

– Three 20% and one 30% wind scenarios• Scenario 1 - High capacity factor wind development

in the Midwest with larger transmission component• Scenario 2 – Hybrid Midwest wind with some local

resources with lower capacity factor onshore wind and offshore

• Scenario 3 – Focus on local resources with enhanced offshore

• Scenario 4 – 30%, all in• All of four scenarios require a lot of wind and

transmission!


Scenario 1 – 20%“High Capacity Factor, On shore”

Region Onshore (MW) Offshore (MW) Total (MW)MISP/MAPP 94,808 - 94,808

SPP 91,843 - 91,843 TVA 1,247 - 1,247 SERC 1,009 - 1,009

PJM ISO 22,669 - 22,669 NYISO 7,742 - 7,742 ISO-NE 4,291 - 4,291 Total 223,609 - 223,609


Scenario 2 - 20% “Hybrid with Offshore”

Region Onshore (MW) Offshore (MW) Total (MW)MISO/MAPP 69,444 - 69,444

SPP 86,666 - 86,666 TVA 1,247 - 1,247 SERC 1,009 4,000 5,009

PJM ISO 28,192 5,000 33,192 NYISO 13,887 2,620 16,507 ISO-NE 8,837 5,000 13,837 Total 209,282 16,620 225,902


Scenario 3 - 20% “Local, with Aggressive Offshore”

April 30, 2009


SPP 50,958 - 50,958 TVA 1,247 - 1,247 SERC 1,009 11,040 12,049



Scenario 4 - 30% “Aggressive On- and Off-Shore”


SPP 94,576 - 94,576 TVA 1,247 - 1,247 SERC 1,009 11,040 12,049



20% wind Scenarios

64,100230,29916,620225,902-223,609Total Capacity

11,04024,9275,00013,837-4,291ISO-NE

9,28023,1672,62016,507-7,742NYISO

3978078,7365,00033,192-22,669PJM

4,0005,0094,0005,009-1,009SERC

-1,247-1,247-1,247TVA

-39,328-69,804-66,576SPP

-57,885-86,306-120,075MISO/MAPP

Offshore (MW)Total (MW)Offshore (MW)Total (MW)Offshore

(MW)Total (MW)

3: Load-weighted Wind Development, Aggressive Offshore2: Hybrid w/Offshore1: Lowest Cost Wind

Region

64,100230,29916,620225,902-223,609Total Capacity

11,04024,9275,00013,837-4,291ISO-NE

9,28023,1672,62016,507-7,742NYISO

3978078,7365,00033,192-22,669PJM

4,0005,0094,0005,009-1,009SERC

-1,247-1,247-1,247TVA

-39,328-69,804-66,576SPP

-57,885-86,306-120,075MISO/MAPP

Offshore (MW)Total (MW)Offshore (MW)Total (MW)Offshore

(MW)Total (MW)

3: Load-weighted Wind Development, Aggressive Offshore2: Hybrid w/Offshore1: Lowest Cost Wind

Region


Wind Capacities by Scenario and Regional Entity


The Power of Aggregation


EWITS Methods & Assumptions

2024 wind scenario developmentPower system models for 2024Conventional generation expansion Develop conceptual transmission overlaysEvaluate operating impactsEvaluate resource adequacyEstimate annualized costs

October 2, 2009 EWITS Technical Review Committee Webinar


Transmission RequirementsHigh levels of new transmission are needed across the 4 scenarios

Some transmission elements are common to all overlaysReference case, 20% and 30% wind scenarios all require a significant transmission build out, otherwise they are not feasibleTransmission reduces variability and provides capacity benefits in its own right, and enhances the reliability contribution of wind generation by a measureable and significant amount.The EHV DC transmission that constitutes a major portion of the overlays has additional benefitsThe conceptual transmission overlays consist of multiple 800kV HVDC and EHV AC lines

October 2, 2009 EWITS Technical Review Committee Webinar


Transmission Overlay for Scenario 3


Conceptual Transmission Overlays


Wind Integration Costs

$-

$1.00

$2.00

$3.00

$4.00

$5.00

$6.00

2004 2005 2006

Inte

grati

on C

ost $

/MW

H of

Win

d En

ergy

(200

9 U

SD)

Year

Reference

Scenario 1

Scenario 2

Scenario 3

Scenario 4


Total Scenario Costs

-

20,000

40,000

60,000

80,000

100,000

120,000

140,000

160,000

180,000

200,000

Reference Scenario 1 Scenario 2 Scenario 3 Scenario 4

Annu

alize

d Sc

enar

io C

ost (

2009

USD

M$)

Wind Capital Cost

New Generation Capital Cost

Transmission Cost

Integration Cost

Wind Operational Cost

Production cost


Interesting policy and technology development questions

• Could the levels of transmission, including the Reference Case, ever be permitted and built, and if so, what is a realistic time frame?

• Could the level of offshore wind energy infrastructure be ramped up fast enough to meet the aggressive offshore wind assumption in the EWITS scenarios?

• Would a different renewable profile or transmission overlay arise from a bottom-up planning process?

• How can states and the federal government best work together on regional transmission expansion and the massive development of onshore and offshore wind infrastructure?

• What is the best way for regional entities to collaborate to make sure wind is integrated into the bulk electrical grid optimally and reliably ?

• What is the difference between applying a carbon price versus mandating and giving incentives for additional wind?


EWITS –a Link in the Chain • The scenarios developed for this study do not in any

way constitute a plan; instead, they should be seen as an initial perspective on a top-down, high-level view of four different 2024 futures.

• The study assumptions were developed in close coordination with the TRC– Changes in the assumptions, such as the cost of various

fuels, the impact of regulation and policy would have a major influence

• A complete evaluation of any of the scenarios would require additional technical analysis including– An AC analysis which examines in more detail the power

transfer limitations assumed in the production modeling and includes power flows that look at voltage and reactive compensation issues, dynamic and transient stability, and HVDC terminal control.


EWITS Conclusions• High penetrations of wind generation—providing 20% to 30% of

the electric energy requirements of Eastern Interconnection—are technically feasible with significant expansion of the transmission infrastructure.

• New transmission will be required for all the future wind scenarios in the Eastern Interconnection, including the reference case. Planning for this transmission, then, is imperative because it takes longer to build new transmission capacity than it does to build new wind plants.

• Without transmission enhancements, substantial curtailment of wind generation would be required for all of the 20% scenarios.

• Interconnection-wide costs for integrating large amounts of wind generation are manageable with large regional operating pools, where benefits of load and wind diversity can be exploited and large numbers of supply resources are efficiently committed and dispatched.


EWITS Conclusions• Transmission helps reduce the impacts of the variability of

the wind, which reduces wind integration costs, increases reliability of the electrical grid, and helps make more efficient use of the available generation resources.

• Although costs for aggressive expansions of the existing grid are significant, they do make up a relatively small piece of the total annualized costs in any of the scenarios studied.

• Wind generation displaces carbon-based fuels, directly reducing carbon dioxide (CO2) emissions. Emissions continue to decline as more wind is added to the supply picture. Increasing the cost of carbon in the analysis results in higher total production costs.


and the conclusion is…

• There are no fundamental technical barriers to the integration of 20% wind energy into the electrical system, but…

• There needs to be a continuing evolution of transmission planning and system operation policy and market development for this to be achieved.

Eastern Wind Integration and Transmission Study Overview

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