POWER4Georgians

Frequently Asked Questions

GENERAL

  1. What company or corporation is leading the project?
  2. Where will the project be sited?
  3. How many other sites were considered?
  4. From permitting, through construction, how long will it take until the facility is open and in operation?
  5. How much will the power plant cost?
  6. How much power will the proposed plant generate?
  7. Will electricity from the plant be sold out of state?

NEED FOR PROJECT

  1. Why is Plant Washington needed?
  2. What is the rate of growth for the co-ops involved in the project?
  3. What will happen if the power plant is not built?
  4. Why is it important to keep the cost of energy affordable?

CONTROLLING ENVIRONMENTAL IMPACT

  1. Why do you want to build a coal-fired power plant?
  2. What is the cost of coal compared to other fossil fuels?
  3. What about the emissions from Plant Washington?
  4. How does a coal-fired power plant work?
  5. Will this plant use “clean coal” technology?
  6. How much coal will the plant use?

WATER USAGE

  1. How much water will the plant use?
  2. What will be the water source for the plant?
  3. How will it impact the Oconee River?
  4. How will it impact the aquifer?
  5. Isn’t that a lot of water?
  6. How much water with the plant return to the environment?

CONTROLLING EMISSIONS

  1. How will Plant Washington control the emissions coming out of the power plant?
  2. What is a supercritical boiler?
  3. In addition to a reduction in emissions, what are some additional benefits of a supercritical plant?
  4. What do you mean by a “highly-efficient” plant?

ENERGY OPTIONS

  1. Why not use a renewable energy sources?
  2. What about wind energy?
  3. What about solar energy?
  4. How about biomass?
  5. What are other issues to consider with regard to renewable/green energy?
  6. How big would a solar or wind facility need to be to produce the same amount of energy as Plant Washington?
  7. Why is coal the best option?
  8. What about nuclear power?

LOCAL BENEFITS

  1. What economic benefits will Washington County realize as host community for the project?
  2. How many other jobs will be created?
  3. How would you respond to those who say that “Washington County will get the benefits of Plant Washington, the surrounding counties will get the pollution, and Atlanta will get the energy?”
  4. I’ve heard a lot about mercury. What is it and where does it come from?
  5. Do coal plants release mercury into the environment?
  6. What kinds of controls will Plant Washington use to limit mercury emissions?
  7. How much mercury is the plant expected to release into the air?
  8. Will mercury released from Plant Washington substantially change the amount of mercury in the air in Washington County?
  9. Does mercury in air circulate worldwide?
  10. How does some of the mercury in the air end up in fish?
  11. How do we know what levels of mercury are harmful, and what levels are safe?

BYPRODUCTS

  1. Will usable coal byproducts (i.e. gypsum) be produced by the plant? Will it be sold?
  2. What will be managed in the solid materials handling facility?
  3. How will the solid materials handling facility be constructed to prevent infiltration to groundwater?
  4. Will used water be stored on-site?
  5. How will storm water run-off from the construction site be managed?
  6. How will storm water run-off from the solid materials handling facility be managed?
  7. What substances will be contained in water discharged from the plant?
  8. Will water discharge from the plant cause the temperature of the Oconee River to rise?

BEST AVAILABLE CONTROL TECHNOLOGY

  1. What is BACT and how does it apply to Plant Washington?
  2. Will just one type of technology work to control all types of emissions?
  3. What else is included in the BACT analysis process?
  4. Shouldn’t Plant Washington have conducted a case-by-case MACT analysis?

Q: What company or corporation is leading the project?
A: The project will be lead by Power4Georgians (P4G), a consortium of Georgia electric membership corporations (EMCs).

<top>
Q: Where will the project be sited?
A: Plant Washington will be located in Washington County, Georgia, near Sandersville, a rural community located in the eastern part of the state about halfway between Macon and Augusta, and approximately 125 miles southeast of Atlanta.

<top>
Q: How many other sites were considered?
A: While many sites in Georgia hold great potential for power plants, Washington County offered the best location and opportunity for this facility.

<top>
Q: From permitting, through construction, how long will it take until the facility is open and in operation?
A: Although there is no set length of time, in Georgia the permitting process generally takes about two years. Once permitted, the plant will take about four years to build. The total process is expected to take about six years.

<top>
Q: How much will the power plant cost?
A: Capital investment is expected to be approximately $2.1 billion. To put this in perspective, consider that Kia is investing $1.2 billion to build its new manufacturing plant in West Georgia.

<top>
Q: How much power will the proposed plant generate?
A: Plant Washington County will have the capacity to generate about 850 megawatts (MW) of base load power – enough to power 500,000 to 850,000 homes each year. Plant Washington is expected to produce about 6.7 billion kilowatt-hours (kWh) each year.

<top>
Q: Will electricity from the plant be sold out of state?
A: Absolutely not. Plant Washington will help meet the energy needs of the EMCs’ current and future members. NO electricity will be sold to power providers outside of Georgia. This is consistent with the project’s overarching theme of “Clean, Affordable Power for Georgians by Georgians.”

<top>
Q: Why is Plant Washington needed?
A: The need for additional power generation among Georgia EMCs is widespread and, given project lead times, immediate. Although Oglethorpe Power Corporation provides base load, intermediate and peak generation for many EMCs, most also buy supplemental power from other power suppliers to meet member demand for reliable and affordable power.

Over the next five years, many of these supplemental power contracts will expire. With the ever-increasing demand for electricity and the limited supply of new generation resources, these suppliers are expected to charge substantially higher prices for new power contracts. Georgia’s electric co-ops have a responsibility to find the best, most reliable energy available at the best possible price for their members.

From a purely economic standpoint, the cost of building and operating this power facility is a far more wise and affordable solution for the participating EMCs and their members than continuing to buy power on the open market. Plant Washington will provide the EMCs with a consistent, dependable and affordable source of electricity for many, many years to come.
<top>
Q: What is the rate of growth for the co-ops involved in the project?
A: Georgia’s EMCs serve about 4 million citizens in service areas that cover 73 percent of the state. The EMCs projected long-tern growth rate is expected to be about four percent a year. By comparison, the P4G EMCs growth rate is expected to be about five percent. Because of the power contract roll-offs, the increase in per member usage and the expected growth in new members, the EMCs involved in this project anticipating needing significant amounts of additional baseload power generation by 2016.

<top>
Q: Is there still a need for Plant Washington in light of the recent slow down in our economy?
A: History shows us that the economy always rebounds and there will be a need for new energy sources to help fuel this recovery. We expect the rate of demand growth to be slow at first and then continue at an increased pace over the longer term. We review our members' future energy needs on a regular basis and adjust our plans accordingly to provide dependable and affordable electricity. The typical lead time to bring a baseload coal-fired plant on line ranges from six to eight to ten years, from initial announcement to on-line power production. We are building Plant Washington to need our expected needs in 2015.

<top>
Q: What will happen if the power plant is not built?
A: There would be two likely outcomes of not building Plant Washington, and neither is good.
  • The first is that EMCs will have to pay substantially more for the wholesale power they buy from the market – meaning members would see their electricity become more and more expensive. Higher electric rates could cause their business, retail and industrial members to be at a competitive disadvantage.
  • The second result may be a shortage of electricity in the state. Building the plant is a vital part of a comprehensive program to ensure that the citizens of Georgia will not experience power shortages in the future. Without new sources of affordable base load generation like Plant Washington, Georgia could not attract and supply competitively priced electricity to new industries that in-turn good supply jobs to many Georgia citizens, such the Kia automobile plant in West Point. When fully operational, the Kia facility will employ an estimated 2,500 maintenance and production team members. In addition, the Kia supplier base will add an additional 3,000 jobs.
We know the 850 megawatts produced by Plant Washington will be gobbled up as soon as that energy is placed onto the state’s power grid, but will barely put a dent in the projected demand. Without additional capacity, far beyond what Plant Washington and all alternatives combined can produce, we’ll be in a real bind.
<top>
Q: Why is it important to keep the cost of energy affordable?
A: Considering that more than half of all Georgia families earn less than $50,000 per year and that many of those families spend upwards of 25 percent of their income on energy, do we really want to make electricity so expensive that Georgians must choose between electricity and food on the table for their children? That’s where we’re headed if the opponents of utilizing the full spectrum of resources, including renewable energy, hydro, nuclear, coal, etc., have their way. Our planning is done with the best interests of all our members in mind and we will continue to explore new and innovative ways to keep electricity flowing now and for many years to come."

<top>
Q: Why do you want to build a coal-fired power plant?
A: This plant is in line with the U.S. energy independence strategy of relying less on foreign, price-volatile fuels and more on stable domestic energy sources. The United States has the world’s largest known reserves of coal - over 27 percent - enough to meet our needs for the next 200+ years. From an energy standpoint, we have more coal than the Middle East has oil. Coal is a tried and true, readily available, price-stable source of energy.

Base- load, coal-fired power plants are now and will continue to be an important part of our electric supply system. According to DOE, as of April 2009, the U. S. has 86 coal-fired power plants either announced (44), permitted (9), near construction (6) or under construction (27). In May 2009, four new plants came on-line and three new ones were announced.
<top>
Q: What is the cost of coal compared to other fossil fuels?
A: Coal is a bargain now and will be in the future. According to U.S Department of Energy, Energy Information Administration (EIA), in May 2008, the average price of coal delivered to power plants in the Southeast was about $56 per ton. Compared to other fuel sources, this is was like getting oil at $15 per barrel, gasoline at $0.35 per gallon or natural gas at $0.28 per therm. According to EIA, coal is a bargain now and in the future. By 2030, price of oil is expected to increase by 261 percent, natural gas by 175 percent and coal by 53 percent.

<top>
Q: What about the emissions from Plant Washington?
A: Coal is a proven, reliable and cost-effective way to generate electricity. Tremendous advances in clean coal technology make it possible to generate more power from less coal, and with lower emissions per unit of energy than ever before. As proof of the great technological advances made in clean coal technology, consider that the rate of major emissions from coal-based electricity plants has dropped by more than 50 percent since 1970, while the use of coal has tripled during the same period. This plant will use the best available control technologies to increase efficiency and reduce emissions. Plant Washington will be one of the cleanest coal-fired power plants ever built.

<top>
Q: How does a coal-fired power plant work?
A: Coal-fired units produce electricity by burning coal to heat water in boilers that produce steam. Under tremendous pressure, the steam flows into a turbine, which spins a generator to produce electricity. The steam is then cooled, condensed back into water, and returned either to the environment or to the boiler to start the process over again. Wet scrubbers use water and other elements to filter the exhaust air and substantially lower emissions from the plant.

<top>
Q: Will this plant use “clean coal” technology?
A: Clean coal technology used by Plant Washington refers to a number of processes to increase combustion efficiency, lower emissions and even clean the coal itself prior to combustion. This plant will use the best available control technologies including wet flue gas desulfurization (wet scrubber), selective catalytic reduction to reduce nitrogen oxide emissions, fabric filter baghouses to reduce particulate matter and lead, and a high-efficiency supercritical boiler system that allows more power to be generated using less coal. The plant will use a combination of low-sulfur Powder River Basin (PRB) and Illinois Basin coals.
<top>
Q: How much coal will the plant use?
A: Coal usage will depend on the coal type and blend being used, but is expected to be between 3.65 and 4.27 million tons per year. The plant will keep a 60 to 90 day supply of coal on site.

<top>
Q: How much water will the plant use?
A: Plant Washington is expected to use about 13.6 million gallons per day (MGD) of water on average and up to 16.1 MGD during peak usage. About 1.5 MGD will be returned to the Oconee River. The difference between water intake and return is attributable to the water used by the wet scrubbers – the best available emissions control technology for pulverized coal boilers – and water lost through evaporation into the atmosphere in the cooling towers.
<top>
Q: What will be the water source for the plant?
A:

Plant Washington will obtain its water primarily from the Oconee River and secondarily from the Cretaceous Aquifer. Water from the river will be carried to the plant through an approximately 27-mile pipeline. When the flow of the river is below minimum withdrawal standards, the plant will draw water from the Cretaceous Aquifer using a series of wells located along the pipeline. When water is being withdrawn from the aquifer, no water will be withdrawn from the river. Studies show the Oconee River can meet the needs of Plant Washington about 93% of the time.

Plant developers and engineers are also studying additional sources of water that could be used to reduce the amount of water withdrawn from the river, as well as water conservation practices that enhance responsible environmental stewardship.


<top>
Q: How will it impact the Oconee River?
A: Plant Washington will have minimal impact on the Oconee River. According to USGS records, the average flow of the Oconee River is about 1.4 billion gallons per day. On an average day, Plant Washington will use less than one-percent of the flow of the river. On a peak day this creeps just above one percent. When the river flow is such that water must be obtained from the aquifer, Plant Washington will continue to return about 1.5 MGD into the river—thus helping to enhance its downstream flow even during “dry” periods.

<top>
Q: How will it impact the aquifer?
A: Drawing water from the deep aquifer will not affect any existing rivers, ponds, streams or wells. The number of wells and their spacing along the 27-mile pipeline will help ensure that draw-down from any one location in the aquifer will be minimized. Studies of river flow and weather patterns over the last 20 years suggest it will only be necessary to withdraw groundwater from the aquifer for about four months once every five years. This rate of groundwater withdrawal is expected to have a minimal impact on the aquifer and allow more than adequate time for the aquifer to “recharge” before it is necessary to draw from it again.

<top>
Q: Isn’t that a lot of water?
A: Plant Washington will use about four pints of water to produce each kWh. To put this water consumption into perspective, consider the net amount of water used by Plant Washington to supply electricity to a typical Georgia EMC home for a year will be less than the amount of water used by a typical washing machine in that home that year.

<top>
Q: How much water with the plant return to the environment?
A: Plant Washington is expected to return about 1.5 MGD of water to the Oconee River, even when it is obtained from the Cretaceous Aquifer. This means that during times of low river flow, Plant Washington will actually be helping downstream water flow. Water used by the plant will be cleaned and tempered to state surface water standards and then returned to the Oconee River. The plant will use discharge ponds to keep the water return rate relatively consistent.

<top>
Q: How will Plant Washington control the emissions coming out of the power plant?
A: Plant Washington will be one of the cleanest coal plants in the nation, using the best available control technologies: a highly-efficient supercritical boiler that produces more energy with less coal; a state-of-the-art wet scrubber to greatly reduce sulfur dioxide emissions; selective catalytic reduction to greatly reduce nitrogen oxides emissions; fabric filter baghouses to greatly control and remove particulate emissions; sorbent injection to greatly reduce mercury and sulfuric acid mist emissions; and a combination of surface water and groundwater for cooling and process..
  • NOx emissions: Emissions are reduced using a combination of low NOx burners, over fire air (OFA) and selective catalytic reduction (SCR) technology.
  • SO2 emissions: SO2 is captured using wet limestone flue gas desulfurization (FGD). The end product, gypsum, can be recycled for use in products such as wallboard, plaster and fertilizer.
  • Particulate emissions: Particulate matter is removed using fabric filter baghouses for control of particulate matter (PM and PM10 – particulate matter 10 microns in diameter or smaller), lead and other pollutants. By comparison, a human hair is 25 to 100 microns thick.

<top>
Q: What is a supercritical boiler?
A: Supercritical boilers are frequently used for the production of electric power. Supercritical power plants use a boiler/turbine system that operates at a high enough pressure and temperature (greater than 3200 pounds per square inch gauge [psig] and 1075º F) that water is no longer considered a gas or a liquid but is characterized as a supercritical fluid with thermodynamic properties that are in between the two phases. Operating in this mode allows a supercritical plant to be more energy efficient than a subcritical plant which generally operates at lower steam temperatures (usually 2,400 psig and 850º F). Supercritical power plants are more efficient than subcritical power plants, resulting in less fuel use and, therefore, lower overall emission rates per unit of energy produced. With more than 400 supercritical facilities having been built around the world, supercritical boilers are considered a proven technology.
<top>
Q: In addition to a reduction in emissions, what are some additional benefits of a supercritical plant?
A: There are many benefits, most notably that fuel costs are reduced because improved technology allows the plant to operate more efficiently – somewhat like an new automobile that gets more miles to the gallon of gas than an older, less-fuel-efficient vehicle.
<top>
Q: What do you mean by a “highly-efficient” plant?
A: This term 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 cycle is converted into electrical energy. The greater the output of electrical energy for a given amount of energy input, the higher the efficiency. Improving the efficiency level increases the amount of energy that can be extracted from a single unit of coal. Huge improvements already have been made – the thermal efficiency of electricity from coal improved eightfold during the 20th century.
<top>
Q: Why not use a renewable energy sources?
A:

When one uses the term "renewable energy" they usually mean wind, solar or biomass energy. We too wish it was that simple and such resources were abundantly available here in Georgia. The fact is, the P4G EMCs involved have signed up for every renewable energy project that has been announced — and the reality is there just isn’t enough of it.

All of the EMCs involved in Power4Georgians support the use of renewable power sources. The EMCs, through GreenPower EMC, have invested in over 27 megawatts (MW) of renewable energy, including 25 MW of biomass, 2.3 MW of low head hydroelectric and 14 kW of photovoltaic (PV) demonstration projects located at various schools around the state. Power4Georgians is exploring a two MW solar PV facility near Sandersville.

While renewables have their challenges, the reality is that the EMCs in this state have been leaders through their green power and solar programs to promote renewable energy. Further, the EMCs recognize that renewables must be part of the ongoing energy generation portfolio.


<top>
Q: What about wind energy?
A:

Wind power is notoriously flighty, particularly at ground level. Most turbine-on-a-post wind powered generators operate at around 30 percent of their rated generation capacity, simply because wind is intermittent and changes direction. Most wind turbines start generating electricity at wind speeds of around 3.5 m/s (7.8 mph); generate maximum ‘rated’ power at around 13 m/s (29 mph); and shut down to prevent storm damage at 25 m/s or above (56 mph).

According to the Southeast Regional Climate Center, the average wind speed in GA is about 7.4 mph, ranging from a high of 8.9 mph in March to a low of 6.1 mph in August, when we need to power the most. The U.S. Department of Energy notes that prevailing winds in Georgia are insufficient to sustain a wind-energy program of any significance other than off the Savannah coast. Furthermore, building of the transmission system would require towers or underground facilities to cross beaches and marshlands. In either case, the transmission system would appear to be economically and environmentally unacceptable.

Never the less, Green Power EMC has moved into the second phase of a wind assessment project at Rocky Mountain Pumped Storage Hydroelectric Plant in Floyd County. It continues to explore national regulatory approvals, conduct environmental studies, and address design challenges and structural issues.


<top>
Q: What about solar energy?
A: Factors such as the angle of the sun, length of day, weather patterns, humidity and haze can affect the amount of local sun shining at the earth's surface. Solar energy can only be generated when the sun shines and that only occurs, on average, about 1,800 hours per year — 20.5 percent of the time — and the cost of solar today on per kilowatt hour basis is almost six times the current wholesale price of electricity. Solar systems are most productive at solar noon and about three hours on each side of noon. The greatest need for electricity usually occurs from 5:00p to 8:00p -- when families come home from work, turn on their A/C units, prepare dinner, wash dishes, wash and dry clothes, watch TV and log onto their computers.
<top>
Q: How about biomass?
A: In the case of biomass, while we are very blessed that 66-percent of our state is covered in trees, research done by the University of Georgia’s Warnell School of Forestry and Natural Resources, and presented in Gov. Perdue’s energy plan, shows that the state’s entire power capacity from biomass amounts to about 675 megawatts.
<top>
Q: What are other issues to consider with regard to renewable/green energy?
A:

Space is a huge issue when it comes to renewable energies. Wind turbines and large scale solar programs require a substantial footprint to be effective and economical. Coal-fired plants, on the other hand, can produce very large quantities of energy on a relatively small footprint. In addition, solar and wind power projects can only provide energy when the sun is shining or the wind is blowing; however, a fossil-fired power plant generally runs almost constantly.

Consider that Plant Washington will deliver 850 MW of power from an approximately 1,641 acre site – with an actual footprint of fewer than 900 acres – and run more than 90 percent of the year producing almost seven billion kWh of electricity. An 850 MW solar installation would require between 6,000 and 9,000 acres (10 to 14 square miles) and deliver power 20 to 30 percent of the time (and never at night). Likewise, an 850 MW wind power installation (1,700 turbines at 500 kW each) would require more than 270,000 acres (approximately 425 square miles) and provide its rated capacity only 25 to 30 percent of the time.


<top>
Q: How big would a solar or wind facility need to be to produce the same amount of energy as Plant Washington?
A: Each year, the 850 MW Plant Washington facility is expected to produce about 6.7 billion kWh of electricity. To get the same energy output as Plant Washington, one would need to install a solar system that has three to five time the MW capacity of Plant Washington or a wind system three to four times larger bigger than Plant Washington. All of which will require much more land and capital investment.
<top>
Q: Why is coal the best option?
A:

At the current time, none of these technologies is sufficient to meet our base load power generation needs – the consistent, steady, 24/7 supply of electricity we use to power our homes, businesses and manufacturing facilities.

Coal-fired power plants, such as Plant Washington, can produce base load electricity for less than $010 per kWh, which is very cost effective. With improving technologies, the costs of producing green energy should become competitive in the years ahead, but in the foreseeable future, coal clearly remains a highly dependable, reliable and affordable source of power.


<top>
Q: What about nuclear power?
A:

Nuclear power plants are excellent sources of baseload power generation, although they incur higher initial capital costs for construction than other alternatives. In addition, construction delays are a common occurrence when building nuclear facilities; however, once in service, they have the lowest fuel costs and do not produce any pollutants or greenhouse gases. Nuclear power will continue to be an important part of a diverse power supply portfolio for Georgia EMCs.

Through Oglethorpe Power Corporation (OPC), the EMCs own a 30% share of Georgia’s two nuclear power facilities, Vogtle and Hatch. OPC has signed an agreement that preserves its right to participate on behalf of EMCs, up to its current 30% share, in plans for adding Units 3 and 4 at Plant Vogtle. However, the need for members of those P4G EMCs is immediate and exceeds their share of all new capacity from a Vogtle expansion. Delays in opening a plant could negatively impact the availability and affordability of electricity.


<top>
Q: What economic benefits will Washington County realize as host community for the project?
A: Plant Washington offers a wide range of economic benefits to Washington County. The plant will:
  • Almost double the county’s tax base
  • Create over 120 new full-time direct jobs
  • Create over $7 million in new wages
  • Create over 200 new spin off jobs in the Washington County area
  • Require $1 to $4 million in long term support services
  • Generate up to $1 million in new business growth
  • Become a catalyst for new industry.
Unlike other industrial development projects that may come and go with the economy, technology and times, the useful life of a power plant is about 50 years.

<top>
Q: How many other jobs will be created?
A: During the construction period, Plant Washington will require almost 45,000 person months of skilled construction jobs, peaking at almost 1,600 annual jobs.

<top>
Q: How would you respond to those who say that “Washington County will get the benefits of Plant Washington, the surrounding counties will get the pollution, and Atlanta will get the energy?”
A:

First, because of its advanced emissions control systems, the amount of emissions produced by Plant Washington will be so small as to be insignificant, almost immeasurable. As the small amount of emissions travel beyond the property line, the concentration will become even less the greater the distance traveled.

Second, When one flips a switch to turn on a light or an air conditioner, electrons immediately flow from the generating facility to the point of use via a transmission and distribution system. The electrons follow the path of least resistance, which is usually from the nearest generation facility. So much of the energy produced by Plant Washington will be actually used by the customers in closest proximity to the plant.



<top>
Q: I’ve heard a lot about mercury. What is it and where does it come from?
A: Mercury is a naturally occurring metal and part of earth’s crust. Several types of rocks and ores, notably cinnabar (HgS), contain mercury at concentrations of up to 2%. Volcanoes in areas with mercury-containing ores contribute about half of the mercury present in outdoor air. Granite contains about 0.2 parts per million (ppm). Mercury is also present at very low levels throughout the biosphere. Its absorption by plants may account for the presence of mercury within fossil fuels like coal, oil, and gas, since these fuels are conventionally thought to be formed from geologic transformation of organic residues. Mining, various industrial processes and some forms of waste combustion also release mercury into ambient air. A growing source of mercury is disposable products, such as compact fluorescent bulbs and personal electronics (cell phones, LCD TVs, digital cameras), which contain mercury.

<top>
Q: Do coal plants release mercury into the environment?
A: Yes. Coal naturally contains small amounts of mercury – at concentrations of about 0.00001 percent. When coal is burned, a majority of the mercury is captured by the emissions control systems and a small quantity is released via the exhaust stack(s).

<top>
Q: What kinds of controls will Plant Washington use to limit mercury emissions?
A: Plant Washington is being engineered with state-of-the-art mercury control technologies. These include injection of activated carbon, use of wet scrubbers, and particle control by means of fabric filter baghouses. In addition, any mercury emissions will be monitored continuously..

<top>
Q: How much mercury is the plant expected to release into the air?
A: The expected rate of mercury release, according to Plant Washington’s air permit application, is about 0.02 ounces per hour. EPA considers this mercury release-rate to be too small to be harmful. A simple atmospheric transport model, designed to substantially overestimate potential problems, predicted that mercury concentrations due to plant emissions would be less than 1/100 of allowable health limits.
<top>
Q: Will mercury released from Plant Washington substantially change the amount of mercury in the air in Washington County?
A:

No. When Plant Washington is built, there should be less mercury in the air than there is today. Between now and 2016, many operating coal-fired power plants in Georgia are going to install emission control system similar to those being installed at Plant Washington, reducing the amount of mercury potentially released to the atmosphere by 70-95 percent. Even using the lower estimate of 70 percent, by 2016, the amount of mercury circulating in Georgia’s air will be reduced by 2,640 pounds and perhaps as much as 3,395 pounds. Plant Washington’s small mercury discharge will be more than offset by these reductions.

According to research by a leading expert on mercury, the air in Washington Country currently contains about 1 to 2 nanograms of mercury per cubic meter of air. If Plant Washington were to be built and operated as planned, it could increase local concentrations of mercury in air by 0.001 nanograms per cubic meter or 0.05 to 0.1 percent. Such an increase would have no measurable or meaningful effect on mercury concentrations in fish, game, produce or any other food-sources.


<top>
Q: Does mercury in air circulate worldwide?
A: Yes. Mercury released into air is transported by winds and, in its elemental form, persists for one year or more in the upper atmosphere. According to the EPA this atmospheric persistence means that mercury emitted from all parts of the globe – and predominantly from China and India – can be found in many other parts of the globe. Approximately two-third of all mercury emitted worldwide comes from Asia with the United States contributing less than eight percent of total worldwide emissions. Over 84 percent of all mercury deposited in the U.S. originates outside of our borders.
<top>
Q: How does some of the mercury in the air end up in fish?
A: Once airborne mercury is deposited back to the ground, it is washed into soils, rivers, lakes and oceans. Then, through interactions with bacteria in soils, sediments and water, mercury may become chemically transformed into methylmercury. Methylmercury in fresh and salt waters can then be taken up by algae or plankton. As small fish and other animals eat plants and algae, and are in turn eaten by bigger animals (and those bigger animals are eaten by still bigger animals), methylmercury may bioaccumulate in the food chain.
<top>
Q: How do we know what levels of mercury are harmful, and what levels are safe?
A:

Mercury has been studied by health scientists for many years. These studies have looked at health impacts to people and to animals. Two very serious accidents involving gross overexposures to mercury have shed light on the amounts of mercury that causes harm to people. In both cases, people who ate large amounts of mercury-contaminated foods over extended periods of time were seriously harmed, and some died. The amounts of methyl mercury ingested during these accidents were several thousands of times more than the amounts of methyl mercury ingested by people in the U.S.; accidents like these have never occurred in the U.S.

Scientific researchers from the University of Rochester have done extensive studies of children living in the Seychelles Islands in the Indian Ocean, where people’s diets contain very large amounts of ocean fish. These studies found that amounts of mercury that are 10 to 20 times larger than amounts ingested in the U.S. caused no observable harm.

Finally, although many streams and ponds in Georgia, and throughout the U.S., have been posted with fish advisories, these advisories are set with ample margins of safety – so that even people eating fish from restricted areas are not expected to be harmed. Also, all fish and all other foods naturally contain small amounts of mercury; it is not possible to eat a mercury-free diet.


<top>
Q: Will usable coal byproducts (i.e. gypsum) be produced by the plant? Will it be sold?
A:

Yes, reusable materials including fly ash and gypsum will be part of what is produced by the plant’s normal operational processes. As produced, both materials will be available for recycling and will be sold according to demand in the market place. Transport of these materials can be facilitated by rail or by trucks with minimal traffic increase within the Sandersville area.

Fly ash has been used successfully as a partial replacement for Portland cement in the manufacture of concrete mixes. Because of its cement-like and soil stabilizing properties, fly ash is also used in the construction of runways, roadways and bridges, and for soil slope stabilization. Additionally, fly ash is used as a soil additive to increase soil pH and nutrient content. Gypsum also has been used as a soil additive and can be used to improve calcium and sulfur content. In addition, gypsum could potentially be used to manufacture drywall board (“sheetrock”).


<top>
Q: What will be managed in the solid materials handling facility?
A: By-product materials managed on-site will include bottom ash, fly ash and gypsum. The materials will be low in moisture content during placement and storage. To facilitate recycling, the ash and gypsum will be managed in separate storage “cells.” Approximately 118 acres will be used for ash handling and 267 acres used for gypsum handling, for a total of 385 acres. Plant Washington can store up to 30 years supply of both ash and gypsum on site. Plant Washington will not have a slurry pond storage system.
<top>
Q: How will the solid materials handling facility be constructed to prevent infiltration to groundwater?
A: To protect the environment and to ensure that the stored ash will not impact the ground or surface water, Plant Washington’s ash will be managed in a solid materials handling facility very similar in design and construction to a federally-regulated municipal solid waste storage facility. The Plant Washington dry ash storage facility will include the following protective measures:
  • A two-layer composite liner will be constructed at the storage facility to prevent percolation of water through the stored materials to the underlying groundwater.
  • The first layer will be approximately two feet thick and comprised of compacted soil, synthetic clay materials and a non-permeable synthetic flexible membrane.
  • The second layer, underlying the non-permeable membrane, will consist of cohesive soil (clay) also two feet thick.
  • Above this four-foot-thick synthetic barrier will be a two-foot-thick drainage layer with an integrated sump and water collection system to remove any free water (i.e. rain) that enters the storage facility for treatment.
  • In addition, approximately 30 feet of low-permeability soils underlie the composite liner and will provide further separation from the groundwater table.
  • The surface of the solid materials handling facility will be sloped to facilitate drainage, and areas that remain inactive will be covered.
Recent studies by both the U.S. Environmental Protection Agency (EPA) and RTI International (a not-for-profit scientific research firm) indicate that limited human health or environmental risk is posed by handling facilities that use a composite liner such as the one that will be constructed at the Plant Washington solid materials facility.
<top>
Q: Will used water be stored on-site?
A: Much of the water used at the plant will be captured and stored on-site in detention basins for reuse in the plant. In addition, storm water that is not exposed to stored ash and gypsum also will be collected and stored for use at the plant.
<top>
Q: How will storm water run-off from the construction site be managed?
A: Current construction practices manage surface runoff through the use of diversion ditches, berms and drainage basins. Permeable paving materials also will be used for the construction of temporary road beds.
<top>
Q: How will storm water run-off from the solid materials handling facility be managed?
A:

Storm water run-off will be managed on-site depending on where it falls and what it contacts. Storm water that does not fall on the solid materials handling facility will be diverted around the storage cell so it will not come into contact with stored ash and gypsum. This water will either be routed to on-site storage basins for reuse at the plant or routed to sediment ponds for removal of silt and sediment prior to release to Williamson Swamp Creek.

Storm water that falls onto the storage cell (and comes into contact with stored ash and gypsum) will be collected by a sump and collection system that is integrated into the storage facility design. The water collected from the storage facility sump and collection system will be treated for removal of particulates and pH adjustment then routed to on-site storage basins for reuse at the plant. Run-off from the solid materials handling facility will not be returned to the environment without treatment.


<top>
Q: What substances will be contained in water discharged from the plant?
A: The mineral content of the discharge water will be similar to the source water from the Oconee River. The majority of process water and storm water will be re-circulated within the plant process water loop and reused. Cooling tower blow down water that is not recycled will be tested to ensure it meets state and federal water quality standards prior to being returned to the Oconee River.
<top>
Q: Will water discharge from the plant cause the temperature of the Oconee River to rise?
A: Water for discharge will first be retained on-site in an equalization basin to allow heat to equalize with surrounding temperatures. The water will then travel several miles through a pipeline with additional heat dissipating during transport. After mixing with the Oconee River water, the river temperature increase will be less than one degree Fahrenheit in the discharge area.
<top>
Q: What is BACT and how does it apply to Plant Washington?
A:

BACT stand for “best available control technology.” When a new power plant or other facility is being developed that will emit certain regulated substances, the facility must perform what is called a BACT analysis as part of its permitting process.

During the BACT analysis process, facility engineers perform an extensive evaluation of each of the facility’s regulated emissions and the most effective technologies to limit those emissions to comply with state and federal regulations. For a supercritical coal-fired power plant, the major types of emissions that are required by law to be controlled and are therefore subject to BACT analysis include particulate emissions, nitrogen oxide (NOx), sulfur dioxide (SO2), volatile organic compounds(VOC),sulfuric acid mist, fluorides (as HF), lead (Pb), carbon monoxide (CO) and mercury (Hg). Mercury BACT is not required under Federal Regulations but is under State (Georgia) regulations.

There are five steps in a typical BACT analysis for each type of emission:

  • Identify all control technologies
  • Eliminate technically infeasible options
  • Rank remaining technically feasible options
  • Evaluate remaining control technologies
  • Select BACT

<top>
Q: Will just one type of technology work to control all types of emissions?
A:

No. Because of their unique chemical and physical properties, different types of emission compounds are best controlled by different technologies. For example, particulate emissions are best controlled through what is called a fabric filter baghouse, while NOx emissions are best controlled through a combination of combustion controls and a selective catalytic reduction process. SO2 emissions are best controlled through wet flue gas desulfurization technology – more commonly referred to as “wet scrubbers.” For this reason, a modern power plant such as Plant Washington will be engineered with multiple emissions control technologies to assure that all types of emissions are controlled in compliance with state and federal air quality standards.

It should be noted that the emissions control technologies that will be used at Plant Washington are designed to work in tandem. In some cases, more than one technology is used for the control of a single type of emission; for example, both low NOx burners and over-fire air ports reduce emissions of nitrogen oxides. In other cases, an individual control technology is effective at reducing multiple types of emissions – the fabric filter baghouses reduce emissions of both mercury and particulate matter. The result is an interconnected system of controls that will reduce regulated emissions from Plant Washington to levels that are among the lowest in the nation.


<top>
Q: What else is included in the BACT analysis process?
A: A comprehensive BACT analysis is not only performed for every type of emission, but also includes every emission source at the facility. For example, Plant Washington, like many power plants, will use an auxiliary boiler powered by fuel oil for start-up. As a result, the facility’s BACT analysis also must include an analysis of the emissions from the auxiliary boiler, even though it will only be used infrequently. For this reason, a comprehensive BACT analysis for a modern generating facility like Plant Washington can be very large and highly technical. Plant Washington’s 136-page BACT analysis was submitted to state regulators as part of its air permit application, as required by law.
<top>
Q: Shouldn’t Plant Washington have conducted a case-by-case MACT analysis?
A: MACT, which stands for Maximum Achievable Control Technology, addresses emissions of hazardous air pollutants (HAPs) such as acid gases and metals. After Plant Washington’s air permit application was submitted to the Georgia Environmental Protection Division (EPD) in January 2008, the U.S. Court of Appeals (District of Columbia Circuit) vacated EPA rules regarding mercury, including the Clean Air Mercury Rule (CAMR). As a result of that court decision, the main boiler at Plant Washington was required to conduct a case-by-case MACT analysis, which also was submitted to the Georgia EPD as part of the air permit application process.
<top>
<top>

Copyright © 2008 Power4Georgians, LLC. All rights reserved.
Legal Notices and Terms of Use | Report website issues | Update: 20080212a

Valid XHTML 1.0 Transitional Valid CSS!