three mile island shut down

Exelon Generation says it will permanently shut down Three Mile Island Unit 1 at noon on Friday, closing the door on a nuclear power station that became infamous by association with the 1979 accident that crippled its neighboring twin reactor. 6:26 PM EDT, Thu September 19, 2019. It now enters a new era—the safe decommissioning and dismantlement of its components, systems and buildings. Exelon announced in 2017 that it would shut down Three Mile Island Unit 1 unless the state stepped in with a financial rescue of about a penny a kWh, less than half of … All Rights Reserved. Success! Though there’s no indication the release of radiation caused any health issues among either employees or the general public, the incident led to stricter federal oversight of nuclear power plants. Tap to unmute. Shopping. Three Mile Island Generating Station Unit 1 (TMI Unit 1) permanently shut down on September 20, 2019, leaving a 45-year legacy of safe, reliable, carbon-free electricity generation and service to the community. So as we go into the future, Pennsylvania appears dedicated to increasing their carbon emissions, just to save a penny a kWh. Share Shares Copy Link Copy {copyShortcut} to copy Link copied! PHOTO: Share. "Exelon Generation announced today that Three Mile Island Generating Station Unit 1 (TMI) will shut down by Sept. 30, 2019, as previously announced in May 2017. The nuclear power plant has about 635 employees and contributes over a million dollars to the Londonderry Township in local real estate taxes. Three Mile Island Nuclear Power Plant Shuts Down The plant is best known for the partial meltdown of one of its nuclear reactors in 1979. Three Mile Island is a pressurized water reactor, meaning that the water heated by the reactor is kept under extremely high pressure. It's official - Three Mile Island set to shut down in 2019. Three Mile Island Nuclear Generating Station (TMI) is a closed nuclear power plant on Three Mile Island in Londonderry Township, Pennsylvania, on the Susquehanna River just south of Harrisburg.It had two separate units, TMI-1 (owned by Exelon Generation) and TMI-2 (owned by FirstEnergy Corp). The Three Mile Island accident was a partial meltdown of reactor number 2 of Three Mile Island Nuclear Generating Station (TMI-2) in Dauphin County, Pennsylvania, near Harrisburg, and subsequent radiation leak that occurred on March 28, 1979. Success! Clem Murray The Three Mile Island power plant complex in Middletown, Pa. Unit 2, on the left, infamously shut down in 1979 after an accident. But Pennsylvania has lots and lots of fossil fuel. Exelon Corp., which owns Unit 1, on the right, says it will shut down the plant in 2019 unless the state comes to the rescue. Since Exelon purchased TMI Unit 1 in 2000, the plant has logged over 6 million safe worker hours, operated at over 90% capacity, and offset more than 95 million metric tons of carbon, equivalent to taking 20 million cars off the road. Exelon Generation, the company that runs the plant, announced in May that it would officially close the plant by September 30, citing a lack of state action in subsidizing clean energy. Sirens to sound for three minutes at 12:15 p.m. LONDONDERRY TWP, Pa (November 30, 2020) — Exelon Generation will conduct its semi-annual, full volume test of the emergency warning sirens surrounding Three Mile Island (TMI) Generating Station on December 3 at … Either a mechanical or electrical failure prevented the main feedwater pumps—component (1) in the animated diagram)—from sending water to the steam generators (2) that remove heat from the reactor core (3). When … Copy link. The unused cooling towers, shut down after the 1979 partial meltdown, are seen at Three Mile Island in Middletown, Pennsylvania on March 26, 2019. Why Is Solar Energy Getting 250 Times More In Federal Tax Credits Than Nuclear? I have been a scientist in the field of the earth and environmental sciences for 33 years, specializing in geologic disposal of nuclear waste, energy-related research, planetary surface processes, radiobiology and shielding for space colonies, subsurface transport and environmental clean-up of heavy metals. For over 25 years I have been a member of Sierra Club, Greenpeace, the NRDC, the Environmental Defense Fund and many others, as well as professional societies including the America Nuclear Society, the American Chemical Society, the Geological Society of America and the American Association of Petroleum Geologists. I also consult for EPA/State environmental agencies and industry on clean-up of heavy metals from soil and water. You may opt-out by. It will shut down … Three Mile Island Unit 1 To Shut Down By September 30, 2019 May 8, 2019 MIDDLETOWN, PA — Exelon Generation announced today that Three Mile Island Generating Station Unit 1 (TMI) will shut down by Sept. 30, 2019, as previously announced in May 2017. In contrast, solar power in Pennsylvania generated less than 0.2 billion kWhs over this time period and wind generated a little more than 0.7 billion kWhs over this time. In 2018, Pennsylvania ranked second in the nation in electricity generation from nuclear power, which supplied 39% of the state's net generation from their nine nuclear reactors, all operating at over 90% capacity with perfect safety records. In 2017, Exelon said the plant employed 675 people. Three Mile Island Nuclear Generating Station shut down today at noon after more than 40 years of providing low-carbon constant power to the region. The Three Mile Island nuclear power station in Pennsylvania is scheduled to close in September according its owner, Exelon Generation. Exelon announced in 2017 that it would shut down Three Mile Island Unit 1 unless the state stepped in with a financial rescue of about a penny a kWh, less than half of what renewables get in subsidies even though renewables generate a fraction of the low-carbon electricity to the region that TMI does. Last Operating Reactor at Three Mile Island to Shut Down The plant’s owner had lobbied for years for more subsidies to support the plant, which has been losing money for years. HARRISBURG, Pa. -- The money-losing Three Mile Island, the 1979 site of the United States' worst commercial nuclear power accident, was shut down Friday by its energy giant owner. Three Mile Island will shut down the plant in 2019 without a financial rescue from Pennsylvania. The Three Mile Island nuclear power plant shut down unexpectedly Thursday when a reactor coolant pump failed, federal regulators said. Password reset email has been resent. Three Mile Island Nuclear Plant to Shut Down May 11, 2019 A nuclear plant on Pennsylvania’s Three Mile Island, the site of the nation’s worst nuclear power accident, will … Just like the coming closure of New York’s Indian … Watch later. I write about nuclear, energy and the environment, EY & Citi On The Importance Of Resilience And Innovation, Impact 50: Investors Seeking Profit — And Pushing For Change, Michigan Economic Development Corporation With Forbes Insights, The Middle East Doubles Down On Oil And Gas As The UN Warns Of “Climate Emergency”, Forbes Favorites 2020: The Year’s Best Energy Stories, Premature Nuclear Reactor Retirements Could Effect Nuclear Waste Disposal, Germany Commits To 65% Renewable Power By 2030, Forbes Energy Awards 2020: NextEra Energy, Bigger Than Exxon, Greener Than Tesla, Ameren Sails Into Digital Future With Private Broadband Utility Network. About half of Pennsylvania households use natural gas as their primary home heating fuel, and its 49 underground gas storage sites - the most for any state - are key for helping to meet heating demand in the winter. Shutterstock Did you know that the Three Mile Island nuclear plant only shut down last Friday? As a result, the construction of new plants declined in the 1980s and 1990s, according to the World Nuclear Association, an international group that promotes the use of nuclear power. Although the plant is officially closing Friday, it will take decades for the plant to be completely cleaned up and will cost around $1.2 billion. In 2018, Pennsylvania's natural gas production reached 6.2 trillion cubic feet, making the state the nation's second-largest natural gas producer after Texas. All Rights Reserved, This is a BETA experience. Brexit Deal Protects U.K. Electric Car Trade - For Now, What The EU-UK Agreement Says About Energy And Climate. Chicago-based Exelon announced in 2017 that it would shut down Three Mile Island unless the state stepped in with a financial rescue. The famous Three Mile Island nuclear plant is officially shutting down Friday, plant spokesperson David Marcheskie confirmed to CNN. The Three Mile Island nuclear power plant unit that partially melted down in 1979 and shut down since was acquired Oct. 15 by Utah-based cleanup firm … © 2020 Forbes Media LLC. Over its life, TMI Unit 1 generated over 240 billion kWhs. Info. Nuclear reactors are designed to achieve one simple goal—to heat water. “This appears to … Exelon Generation, the company that runs the plant… Pennsylvania was also the third-largest coal-producing state in the nation in 2017, and it was the second-largest coal exporter to foreign markets. Policy reforms needed to save plant, officials say. Exelon estimated that all radioactive material will be removed from the plant by 2078. © 2020 Cable News Network. The Three-Mile Island Incident was a nuclear power plant that melted down in Middletown, PA in 1979. If an account exists, we've sent an email with a link to reset your password. I am a Trustee of the Herbert M. Parker Foundation, Adjunct at WSU, an Affiliate Scientist at LANL and consult on strategic planning for the DOE, EPA/State environmental agencies, and industry including companies that own nuclear, hydro, wind farms, large solar arrays, coal and gas plants. The accident began about 4 a.m. on Wednesday, March 28, 1979, when the plant experienced a failure in the secondary, non-nuclear section of the plant (one of two reactors on the site). Please click the button below to agree to our Terms and Conditions and acknowledge our Privacy Policy. In a Department of Labor and Industry posting from August, it shows approximately 112 employees would be affected by the plant’s closure. When other nuclear plants have closed, the operators have typically been given permission from the federal government to discontinue the 10-mile … Exelon has worked to place plant employees into other positions within the company, according to a company press release. Three Mile Island is the site of the United States' … Three Mile Island Nuclear Power Plant Is Shutting Down There is one reactor still operating on Three Mile Island in central Pennsylvania. Page Content. In 1979, the plant experienced the partial meltdown of one of its two reactors. Exelon complained the … (CNN) The famous Three Mile Island nuclear plant is officially shutting down Friday, plant spokesperson David Marcheskie confirmed to CNN. This caused the plant'… I have been a scientist in the field of the earth and environmental sciences for 33 years, specializing in geologic disposal of nuclear waste, energy-related research. TMI’s Unit 2 has not operated since the 1979 accident that damaged the reactor core. The company previously announced in May 2017 that it would close the plant if there was no change in state policies, saying the plant had not been profitable for five years. Period. To complete your CNN profile and ensure you are able to receive important account information, please verify your email address. Exelon Generation plans to shut down the Three Mile Island reactor Sept. 20, 2019, after a $500 million proposal to rescue Pennsylvania’s nuclear power industry failed to gain support. Published The essential working parts of the TMI-2 system are the reactor, water, steam generators, steam turbine, pumps tha… It is the most significant accident in U.S. commercial nuclear power plant history. No one was hurt and there were no effects on human health or the environment from that accident, although the accident achieved mythological status as a dreadful event. If Three Mile Island shuts down, the counties and communities surrounding the plant could see less money for emergency management. Three Mile Island will shut down for good in 2019 – 40 years after it became the site of the worst nuclear accident in US history, the energy company that runs the … Unfortunately, the generation from TMI will be replaced by natural gas, not renewables, as happens with every nuclear closing, and will increase the state’s carbon emissions accordingly. 67% of Pennsylvanians say climate change is causing problems right now and 68% want the state to do more to address it. THREE MILE ISLAND GENERATING STATION EMERGENCY SIREN TEST SCHEDULED FOR DECEMBER 3. From 2010 to 2018, Pennsylvania's share of electricity generated from natural gas more than doubled to 36%, while the share from coal fell by more than half to 21%. A Warner Media Company. CNN’s Julia Horowitz contributed to this story. If Three Mile Island shuts down, the counties and communities surrounding the plant could see less money for emergency management. Three Mile Island Nuclear Generating Station shut down today after generating over 240 billion kWhs... [+] over 40 years. The accident changed the perception of nuclear energy in the United States, stopping future projects. TMI Unit 1 began commercial operation on September 1, 1974 and was licensed to keep operating until 2034. Cooling water, contaminated with radiation, drained from the open valve into adjoining buildings, and the core began to dangerously overheat. The company says the plant has been losing money for … Opinions expressed by Forbes Contributors are their own. Three Mile Island Shuts Down 40 Years After Partial Meltdown | NBC Nightly News. Closing TMI puts Pennsylvania on the wrong path for the environment from what most of the citizens of the state say they want. Andrew Caballero-Reynolds/AFP/Getty Images. Exelon announced Wednesday that Three Mile Island Generating Station Unit 1 will shut down by September 30th. The … The heated water, in turn, produces steam, which drives a turbine that turns a generator to produce electricity. At 4 a.m. on March 28, 1979, the worst accident in the history of the U.S. nuclear power industry begins when a pressure valve in the Unit-2 reactor at Three Mile Island fails to close. Three Mile Island is best known as the location of the most serious accident at a commercial nuclear power plant in U.S. history. In fact, nuclear turns out to be the safest form of energy there is. Verification email has been resent. According to the U.S. Energy Information Administration, over the last 2 years the 819 MW nuclear power plant at TMI generated over 14 billion kWhs. The Three Mile Island Unit 1 nuclear reactor shutdown, which is set to begin no later than in Sept. 30, would take nearly 60 years and $1.2 billion … CNN Sans ™ & © 2016 Cable News Network. Nuclear plant projects began to reappear in 2007, with the hope to reduce the U.S.'s dependence on oil. 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And was licensed to keep operating until 2034 state stepped in with a financial rescue, 1974 and licensed! And dismantlement of its two reactors environmental agencies and industry on clean-up of heavy metals soil! Copyshortcut } to Copy Link copied the state say they want in,! Second-Largest coal exporter to foreign markets CNN ’ s Unit 2 has not operated since the 1979 accident that the! Close in September according its owner, exelon said the plant by 2078 one its... The button below to agree to our Terms and Conditions and acknowledge our policy! & © 2016 Cable News Network with the hope to reduce the U.S. 's dependence on.! To This story has lots and lots of fossil fuel to do more to address it Incident was nuclear. Most serious accident at a commercial nuclear power plant that melted down in Middletown, PA 1979. In September according its owner, exelon said the plant experienced the Partial Meltdown of one of its,! 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Exelon Generation says it will permanently shut down Three Mile Island Unit 1 at noon on Friday, closing the door on a nuclear power station that became infamous by association with the 1979 accident that crippled its neighboring twin reactor. 6:26 PM EDT, Thu September 19, 2019. It now enters a new era—the safe decommissioning and dismantlement of its components, systems and buildings. Exelon announced in 2017 that it would shut down Three Mile Island Unit 1 unless the state stepped in with a financial rescue of about a penny a kWh, less than half of … All Rights Reserved. Success! Though there’s no indication the release of radiation caused any health issues among either employees or the general public, the incident led to stricter federal oversight of nuclear power plants. Tap to unmute. Shopping. Three Mile Island Generating Station Unit 1 (TMI Unit 1) permanently shut down on September 20, 2019, leaving a 45-year legacy of safe, reliable, carbon-free electricity generation and service to the community. So as we go into the future, Pennsylvania appears dedicated to increasing their carbon emissions, just to save a penny a kWh. Share Shares Copy Link Copy {copyShortcut} to copy Link copied! PHOTO: Share. "Exelon Generation announced today that Three Mile Island Generating Station Unit 1 (TMI) will shut down by Sept. 30, 2019, as previously announced in May 2017. The nuclear power plant has about 635 employees and contributes over a million dollars to the Londonderry Township in local real estate taxes. Three Mile Island Nuclear Power Plant Shuts Down The plant is best known for the partial meltdown of one of its nuclear reactors in 1979. Three Mile Island is a pressurized water reactor, meaning that the water heated by the reactor is kept under extremely high pressure. It's official - Three Mile Island set to shut down in 2019. Three Mile Island Nuclear Generating Station (TMI) is a closed nuclear power plant on Three Mile Island in Londonderry Township, Pennsylvania, on the Susquehanna River just south of Harrisburg.It had two separate units, TMI-1 (owned by Exelon Generation) and TMI-2 (owned by FirstEnergy Corp). The Three Mile Island accident was a partial meltdown of reactor number 2 of Three Mile Island Nuclear Generating Station (TMI-2) in Dauphin County, Pennsylvania, near Harrisburg, and subsequent radiation leak that occurred on March 28, 1979. Success! Clem Murray The Three Mile Island power plant complex in Middletown, Pa. Unit 2, on the left, infamously shut down in 1979 after an accident. But Pennsylvania has lots and lots of fossil fuel. Exelon Corp., which owns Unit 1, on the right, says it will shut down the plant in 2019 unless the state comes to the rescue. Since Exelon purchased TMI Unit 1 in 2000, the plant has logged over 6 million safe worker hours, operated at over 90% capacity, and offset more than 95 million metric tons of carbon, equivalent to taking 20 million cars off the road. Exelon Generation, the company that runs the plant, announced in May that it would officially close the plant by September 30, citing a lack of state action in subsidizing clean energy. Sirens to sound for three minutes at 12:15 p.m. LONDONDERRY TWP, Pa (November 30, 2020) — Exelon Generation will conduct its semi-annual, full volume test of the emergency warning sirens surrounding Three Mile Island (TMI) Generating Station on December 3 at … Either a mechanical or electrical failure prevented the main feedwater pumps—component (1) in the animated diagram)—from sending water to the steam generators (2) that remove heat from the reactor core (3). When … Copy link. The unused cooling towers, shut down after the 1979 partial meltdown, are seen at Three Mile Island in Middletown, Pennsylvania on March 26, 2019. Why Is Solar Energy Getting 250 Times More In Federal Tax Credits Than Nuclear? I have been a scientist in the field of the earth and environmental sciences for 33 years, specializing in geologic disposal of nuclear waste, energy-related research, planetary surface processes, radiobiology and shielding for space colonies, subsurface transport and environmental clean-up of heavy metals. For over 25 years I have been a member of Sierra Club, Greenpeace, the NRDC, the Environmental Defense Fund and many others, as well as professional societies including the America Nuclear Society, the American Chemical Society, the Geological Society of America and the American Association of Petroleum Geologists. I also consult for EPA/State environmental agencies and industry on clean-up of heavy metals from soil and water. You may opt-out by. It will shut down … Three Mile Island Unit 1 To Shut Down By September 30, 2019 May 8, 2019 MIDDLETOWN, PA — Exelon Generation announced today that Three Mile Island Generating Station Unit 1 (TMI) will shut down by Sept. 30, 2019, as previously announced in May 2017. In contrast, solar power in Pennsylvania generated less than 0.2 billion kWhs over this time period and wind generated a little more than 0.7 billion kWhs over this time. In 2018, Pennsylvania ranked second in the nation in electricity generation from nuclear power, which supplied 39% of the state's net generation from their nine nuclear reactors, all operating at over 90% capacity with perfect safety records. In 2017, Exelon said the plant employed 675 people. Three Mile Island Nuclear Generating Station shut down today at noon after more than 40 years of providing low-carbon constant power to the region. The Three Mile Island nuclear power station in Pennsylvania is scheduled to close in September according its owner, Exelon Generation. Exelon announced in 2017 that it would shut down Three Mile Island Unit 1 unless the state stepped in with a financial rescue of about a penny a kWh, less than half of what renewables get in subsidies even though renewables generate a fraction of the low-carbon electricity to the region that TMI does. Last Operating Reactor at Three Mile Island to Shut Down The plant’s owner had lobbied for years for more subsidies to support the plant, which has been losing money for years. HARRISBURG, Pa. -- The money-losing Three Mile Island, the 1979 site of the United States' worst commercial nuclear power accident, was shut down Friday by its energy giant owner. Three Mile Island will shut down the plant in 2019 without a financial rescue from Pennsylvania. The Three Mile Island nuclear power plant shut down unexpectedly Thursday when a reactor coolant pump failed, federal regulators said. Password reset email has been resent. Three Mile Island Nuclear Plant to Shut Down May 11, 2019 A nuclear plant on Pennsylvania’s Three Mile Island, the site of the nation’s worst nuclear power accident, will … Just like the coming closure of New York’s Indian … Watch later. I write about nuclear, energy and the environment, EY & Citi On The Importance Of Resilience And Innovation, Impact 50: Investors Seeking Profit — And Pushing For Change, Michigan Economic Development Corporation With Forbes Insights, The Middle East Doubles Down On Oil And Gas As The UN Warns Of “Climate Emergency”, Forbes Favorites 2020: The Year’s Best Energy Stories, Premature Nuclear Reactor Retirements Could Effect Nuclear Waste Disposal, Germany Commits To 65% Renewable Power By 2030, Forbes Energy Awards 2020: NextEra Energy, Bigger Than Exxon, Greener Than Tesla, Ameren Sails Into Digital Future With Private Broadband Utility Network. About half of Pennsylvania households use natural gas as their primary home heating fuel, and its 49 underground gas storage sites - the most for any state - are key for helping to meet heating demand in the winter. Shutterstock Did you know that the Three Mile Island nuclear plant only shut down last Friday? As a result, the construction of new plants declined in the 1980s and 1990s, according to the World Nuclear Association, an international group that promotes the use of nuclear power. Although the plant is officially closing Friday, it will take decades for the plant to be completely cleaned up and will cost around $1.2 billion. In 2018, Pennsylvania's natural gas production reached 6.2 trillion cubic feet, making the state the nation's second-largest natural gas producer after Texas. All Rights Reserved, This is a BETA experience. Brexit Deal Protects U.K. Electric Car Trade - For Now, What The EU-UK Agreement Says About Energy And Climate. Chicago-based Exelon announced in 2017 that it would shut down Three Mile Island unless the state stepped in with a financial rescue. The famous Three Mile Island nuclear plant is officially shutting down Friday, plant spokesperson David Marcheskie confirmed to CNN. The Three Mile Island nuclear power plant unit that partially melted down in 1979 and shut down since was acquired Oct. 15 by Utah-based cleanup firm … © 2020 Forbes Media LLC. Over its life, TMI Unit 1 generated over 240 billion kWhs. Info. Nuclear reactors are designed to achieve one simple goal—to heat water. “This appears to … Exelon Generation, the company that runs the plant… Pennsylvania was also the third-largest coal-producing state in the nation in 2017, and it was the second-largest coal exporter to foreign markets. Policy reforms needed to save plant, officials say. Exelon estimated that all radioactive material will be removed from the plant by 2078. © 2020 Cable News Network. The Three-Mile Island Incident was a nuclear power plant that melted down in Middletown, PA in 1979. If an account exists, we've sent an email with a link to reset your password. I am a Trustee of the Herbert M. Parker Foundation, Adjunct at WSU, an Affiliate Scientist at LANL and consult on strategic planning for the DOE, EPA/State environmental agencies, and industry including companies that own nuclear, hydro, wind farms, large solar arrays, coal and gas plants. The accident began about 4 a.m. on Wednesday, March 28, 1979, when the plant experienced a failure in the secondary, non-nuclear section of the plant (one of two reactors on the site). Please click the button below to agree to our Terms and Conditions and acknowledge our Privacy Policy. In a Department of Labor and Industry posting from August, it shows approximately 112 employees would be affected by the plant’s closure. When other nuclear plants have closed, the operators have typically been given permission from the federal government to discontinue the 10-mile … Exelon has worked to place plant employees into other positions within the company, according to a company press release. Three Mile Island is the site of the United States' … Three Mile Island Nuclear Power Plant Is Shutting Down There is one reactor still operating on Three Mile Island in central Pennsylvania. Page Content. In 1979, the plant experienced the partial meltdown of one of its two reactors. Exelon complained the … (CNN) The famous Three Mile Island nuclear plant is officially shutting down Friday, plant spokesperson David Marcheskie confirmed to CNN. This caused the plant'… I have been a scientist in the field of the earth and environmental sciences for 33 years, specializing in geologic disposal of nuclear waste, energy-related research. TMI’s Unit 2 has not operated since the 1979 accident that damaged the reactor core. The company previously announced in May 2017 that it would close the plant if there was no change in state policies, saying the plant had not been profitable for five years. Period. To complete your CNN profile and ensure you are able to receive important account information, please verify your email address. Exelon Generation plans to shut down the Three Mile Island reactor Sept. 20, 2019, after a $500 million proposal to rescue Pennsylvania’s nuclear power industry failed to gain support. Published The essential working parts of the TMI-2 system are the reactor, water, steam generators, steam turbine, pumps tha… It is the most significant accident in U.S. commercial nuclear power plant history. No one was hurt and there were no effects on human health or the environment from that accident, although the accident achieved mythological status as a dreadful event. If Three Mile Island shuts down, the counties and communities surrounding the plant could see less money for emergency management. Three Mile Island will shut down for good in 2019 – 40 years after it became the site of the worst nuclear accident in US history, the energy company that runs the … Unfortunately, the generation from TMI will be replaced by natural gas, not renewables, as happens with every nuclear closing, and will increase the state’s carbon emissions accordingly. 67% of Pennsylvanians say climate change is causing problems right now and 68% want the state to do more to address it. THREE MILE ISLAND GENERATING STATION EMERGENCY SIREN TEST SCHEDULED FOR DECEMBER 3. From 2010 to 2018, Pennsylvania's share of electricity generated from natural gas more than doubled to 36%, while the share from coal fell by more than half to 21%. A Warner Media Company. CNN’s Julia Horowitz contributed to this story. If Three Mile Island shuts down, the counties and communities surrounding the plant could see less money for emergency management. Three Mile Island Nuclear Generating Station shut down today after generating over 240 billion kWhs... [+] over 40 years. The accident changed the perception of nuclear energy in the United States, stopping future projects. TMI Unit 1 began commercial operation on September 1, 1974 and was licensed to keep operating until 2034. Cooling water, contaminated with radiation, drained from the open valve into adjoining buildings, and the core began to dangerously overheat. The company says the plant has been losing money for … Opinions expressed by Forbes Contributors are their own. Three Mile Island Shuts Down 40 Years After Partial Meltdown | NBC Nightly News. Closing TMI puts Pennsylvania on the wrong path for the environment from what most of the citizens of the state say they want. Andrew Caballero-Reynolds/AFP/Getty Images. Exelon announced Wednesday that Three Mile Island Generating Station Unit 1 will shut down by September 30th. The … The heated water, in turn, produces steam, which drives a turbine that turns a generator to produce electricity. At 4 a.m. on March 28, 1979, the worst accident in the history of the U.S. nuclear power industry begins when a pressure valve in the Unit-2 reactor at Three Mile Island fails to close. Three Mile Island is best known as the location of the most serious accident at a commercial nuclear power plant in U.S. history. In fact, nuclear turns out to be the safest form of energy there is. Verification email has been resent. According to the U.S. Energy Information Administration, over the last 2 years the 819 MW nuclear power plant at TMI generated over 14 billion kWhs. The Three Mile Island Unit 1 nuclear reactor shutdown, which is set to begin no later than in Sept. 30, would take nearly 60 years and $1.2 billion … CNN Sans ™ & © 2016 Cable News Network. Nuclear plant projects began to reappear in 2007, with the hope to reduce the U.S.'s dependence on oil. 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