POWER4Georgians

Affordable Power For Georgians, By Georgians

Plant Washington

  • The Power4Georgians EMCs have come together to build a modern, state-of-the-art, supercritical, coal-fueled power plant utilizing Best Available Control Technologies to minimize emissions.
  • Located in Washington County, near Sandersville, the 850 MW power plant will provide base load electricity to nearly 700,000 EMC members, will cost approximately US $2.0 billion to build, and will use best available technologies to generate electricity while minimizing total emissions.
  • Economically, during peak construction it will provide employment to over 1,000 workers and will require a permanent workforce of about 120 to 130 skilled workers during the operational phase of the project.
  • The plant is estimated to begin operation in 2013.
Element Description
Locations:

The power plant will be developed on approximately 1,200 acres near, Sandersville, Washington County, in rural east-central Georgia.

Potential impacts to Federal Class I Areas were evaluated during preparation of the air permits for Plant Washington. Seven Class I Areas are within 300 kilometers of the proposed plant with the closest being the Okefenokee National Wildlife Refuge, located approximately 228 kilometers to the south. These evaluations showed acceptable results based on current established guidelines.
Generation: Steam-electric generating station consisting of a supercritical* once-through boiler/turbine installation.
Output: 850 megawatts
Cost:

Capital investment in the power station is expected to total approximately $2.0 billion.

By comparison, the new KIA plant scheduled to be built in West Point Georgia will require an investment of approximately $1.2 billion.
Fuel:

Mixture of pulverized low-sulfur Powder River Basin coal and eastern coal (Illinois Basin #6 coal).

Coal from the western United States is renowned for its extremely low sulfur content, 0.06% to 0.53%.
Water Requirement: Approximately 13.5 million gallons per day (MGD) average; 16 MGD at peak.
Water Sources:

Water sources include non-potable ‘mine dewatering water’ from a nearby kaolin mine (4 MGD), groundwater from Cretaceous aquifer will be used when river levels are low; Oconee River water will only be used when river levels are high.

A portion of water used will be non-potable ‘dewateringwater’ pumped from nearby kaolin mines that otherwise would collect in retention ponds for discharge into local waterways. Using this water lessens the amount of surface and ground water that needs to be withdrawn.
Net Water Consumption:

Approximately 12 MGD average; 14.5 MGD at peak.

The difference between water intake and discharge reflects the net water consumption of the plant. This water is primarily used by the wet flue gas desulfurization system (also known as a wet scrubber), the best available emissions control technology for pulverized coal boilers, and cooling tower evaporation.

On an annual basis, the net amount of water used by this power plant to produce electricity for a typical home in Georgia will be less than the amount of water used by a typical washing machine in that home.
Water Discharge: Up to 5 MGD of discharge water will be cleaned to state surface water standards and discharged to the Oconee River. Daily discharge will enhance flow when river levels are low.
Emission Control:

Flue gas cleanup consists of selective catalytic reduction for nitrogen oxide (NOx) control; wet scrubbers for sulfur dioxide (SO2) reduction; dry sorbent injection for mercury and sulfuric acid mist control; and fabric filter baghouse for PM/PM10, lead, and other pollutants.

Wet scrubbers represent best available emissions control technology for pulverized coal plants, effective at removing emissions of sulfur dioxide (SO2).

Clean Coal Technology:

This plant will use the latest in clean coal technology. Clean coal technology refers to a number of processes to increase combustion efficiency, and lower emissions.

This plant will use the best available technologies including wet flue gas desulfurization, selective catalytic reduction to reduce nitrogen oxide emissions, and a high-efficiency supercritical boiler system that allows more power to be generated using less coal.

Efficiency:

This particular plant will be a highly efficient supercritical facility. “Highly efficient” refers to the effectiveness of the thermodynamic process of a coal-fired power plant. The efficiency describes how much of the energy that is fed into the plant is converted into electrical energy.

The greater the output of electrical energy for a given amount of energy input the higher the efficiency. Improving efficiency levels increases the amount of electric energy that can be extracted from a single unit of coal.

In a nutshell, the plant will require less than two-thirds the amount of coal and emit less than two-thirds the amount of carbon dioxide to produce the same amount of power as traditional/older coal-fired power plants. Additionally, this plant will also use the best available emissions control technology.

Benefits:
  • Reduced fuel costs due to improved plant efficiency.
  • Significant reduction in CO2 emissions when compared to a sub-critical power plant.
  • Excellent availability, comparable with that of an existing sub-critical plant.
  • Plant costs comparable with sub-critical technology and less than other clean coal technologies.
  • Much reduced NOx, SOx and particulate emissions.
  • Compatible with biomass co-firing.
  • Can be fully integrated with appropriate CO2 capture technologies.
  • Reduces existing pollution levels by burning less coal per megawatt-hour produced, capturing the vast majority of the pollutants, while allowing capacity to be added in a timely manner.
  • Produces energy in a way that is much friendlier to our environment.
  • Fuel costs are reduced because improved technology allows the plant to operate more efficiently – somewhat like an automobile that gets more miles to the gallon of gas than a comparable vehicle.

The cost per unit of electric energy produced by the plant will be much lower than that of most other power plants resulting in much more affordable rates for our members.

Job Creation:

The Power Plant will support significant employment across the state and in the county. Employment estimates will be prepared as part of this year's conceptual design activities. However, preliminary estimates suggest:

  • Peak construction employment of over 1,000 workers
  • A permanent workforce of 120 to 130 skilled professionals during the operational phase of the project.
Supercritical Boilers: Supercritical boilers are frequently used for the production of electric power. They operate at "supercritical pressure". In contrast to a "subcritical boiler", a supercritical steam generator operates at such a high pressure (over 3200 PSI) that actual boiling ceases to occur, and the boiler has no water - steam separation. There is no generation of steam bubbles within the water, because the pressure is above the "critical pressure" at which steam bubbles can form. It passes below the critical point as it does work in the high-pressure turbine and enters the generator's condenser. This is more efficient, resulting in slightly less fuel use and therefore less greenhouse gas production. The term "boiler" is actually a misnomer for a supercritical pressure steam generator, as no "boiling" actually occurs in this device.
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