Mcintosh_caes
McIntosh CAES Plant
Technology Type

In-ground Natural Gas Combustion Compressed Air Storage

Rated Power in kW
110,000
Duration at Rated Power (HH:MM)
26:00.00
Description

The 2nd commercial CAES plant, in operation since 1991. Like the Huntorf plant, the McIntosh Unit 1 facility stores compressed air in a solution-mined salt cavern. The cavern is 220 ft in diameter and 1,000 ft tall, for a total volume of 10 million cubic feet. At full charge, the cavern is pressurized to 1,100 psi, and it is discharged down to 650 psi. During discharge, 340 pounds of air flow out of the cavern each second. The cavern can discharge for 26 hours. The plant also utilizes nuclear-sourced night-time power for compression and then produces peak power during the day by releasing the compressed air into a 110-MW gas-fired combustion turbine built by Dresser Rand. The turbine unit also makes use of an air-to-air heat exchanger to preheat air from the cavern with waste heat from the turbine. The waste heat recovery system reduces fuel usage by roughly 25%.

Compared to conventional combustion turbines, the CAES-fed system can start up in 15 minutes rather than 30 minutes, uses only 30% to 40% of the natural gas, and operates efficiently down to low loads (about 25% of full load). The key function of the facility is for peak shaving.

Project Status
Status

Operational

Commissioning On
Jan 01, 1991
Project Includes Multiple Systems

No

Siting
Location
Jefferson Davis Highway and Allen Barnes Rd.,
McIntosh , Alabama
United States
ISO/RTO

N/A

Utility

PowerSouth

Utility Type

Cooperative (Customer Owned)

Grid Interconnection

Transmission

Paired Grid Resource

CAES Generation plant

Ownership &
Value Chain Partners
Ownership Model

Utility-Owned

Equity Owner 1

PowerSouth Utility Cooperative

Equity Owner 1 Percentage
100%
Energy Storage Technology Provider

Dresser-Rand

Cost & Performance
Performance

Burns 30-40% less natural gas than conventional power plants.

CAPEX ($)
$65,000,000.00
Benefits
Service/Use Case 1

Electric Energy Time Shift

Service/Use Case 2

Frequency Regulation

Service/Use Case 3

Electric Supply Reserve Capacity - Spinning

Funding
RD&D Funding

No

Research Partner
Research Institution

Electric Power Research Institute (EPRI)

Metadata
Record Created
2012-06-28 08:55 PM UTC
Last Updated
2014-10-27 05:32 PM UTC
 
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