{"id":3534,"date":"2026-04-24T10:30:00","date_gmt":"2026-04-24T15:30:00","guid":{"rendered":"https:\/\/techy44.okdiario.com\/en\/?p=3534"},"modified":"2026-04-23T21:48:37","modified_gmt":"2026-04-24T02:48:37","slug":"the-uss-nimitz-is-heading-toward-south-america-for-its-last-great-voyage-and-the-real-signal-is-what-the-navy-is-still-projecting-before-retirement","status":"publish","type":"post","link":"https:\/\/techy44.okdiario.com\/en\/the-uss-nimitz-is-heading-toward-south-america-for-its-last-great-voyage-and-the-real-signal-is-what-the-navy-is-still-projecting-before-retirement\/3534\/","title":{"rendered":"The USS Nimitz is heading toward South America for its last great voyage, and the real signal is what the Navy is still projecting before retirement"},"content":{"rendered":"\n

The U.S. Navy has sent the nuclear-powered aircraft carrier USS Nimitz on Southern Seas 2026, an unusual circumnavigation of South America that doubles as one last major run for the service\u2019s oldest active carrier. <\/p>\n\n\n\n

It is a big military headline, but it is also an environmental one, because a carrier strike group is basically a floating airport with a supply chain that never sleeps.<\/p>\n\n\n\n

Here\u2019s the takeaway: nuclear propulsion, to a large extent, keeps the ship itself from burning oil at sea, yet the aircraft overhead and the ships around it still rely on huge volumes of jet fuel<\/a> and diesel, and the Pentagon\u2019s own data shows fuel is the main driver of its operational emissions. So what does a warship have to do with climate targets?<\/p>\n\n\n\n

A long route with real-world constraints<\/h2>\n\n\n\n

Southern Seas 2026 pairs Nimitz with the destroyer USS Gridley for passing exercises, operations at sea, and partner engagements as the ships circle the continent, with port visits planned in Brazil, Chile, Panama, and Jamaica. <\/p>\n\n\n\n

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The Navy says this is the 11th iteration of Southern Seas since 2007, and Nimitz sails with Carrier Air Wing 17, including F\/A-18E\/F Super Hornets and EA-18G Growlers. Rear Adm. Carlos Sardiello called it a \u201cunique opportunity to enhance interoperability,\u201d and the program includes visits that let partners watch carrier flight operations up close.<\/p>\n\n\n\n

The geography matters. Stars and Stripes reported that Nimitz is too large to transit the Panama Canal<\/a>, which means the strike group has to swing around the tip of South America on its way toward the Atlantic. <\/p>\n\n\n\n

The canal\u2019s published limits for the Neopanamax locks cap maximum beam at 51.25 meters, while Navy data lists a Nimitz-class flight deck width of 252 feet (about 76.8 meters).<\/p>\n\n\n\n

Nuclear power is not the same as \u201cno footprint\u201d<\/h2>\n\n\n\n

A carrier like Nimitz can steam for long periods without refueling its reactors, but that is only one slice of the energy picture. The embarked air wing flies fuel-hungry sorties, and the Navy\u2019s own reporting on carrier operations points to JP-5 jet fuel as a constant requirement that is stored aboard the carrier and resupplied at sea.<\/p>\n\n\n\n

You can see the scale in logistics snapshots. In one three-week pre-deployment period, Military Sealift Command ships delivered nearly 3 million gallons of JP-5 and nearly 4 million gallons of diesel ship fuel<\/a> to support a carrier strike group, along with hundreds of pallets of food and parts. That is where emissions and spill risks sit, especially when fuel moves by sea.<\/p>\n\n\n\n

\"The
The USS Nimitz is embarking on its final major deployment around South America, bringing attention to the massive fuel and logistical demands of naval operations.<\/figcaption><\/figure>\n\n\n\n

The Pentagon\u2019s emissions math points straight to fuel<\/h2>\n\n\n\n

The Department of Defense has started putting unusually direct numbers on paper. In its 2023 plan to reduce greenhouse gas emissions<\/a>, DoD reported 56 million tons of carbon dioxide equivalent in Scope 1 and Scope 2 emissions for FY2021, with operational sources making up most of the total. <\/p>\n\n\n\n

The report also says that total is equivalent to about 1% of total U.S. emissions in 2020.<\/p>\n\n\n\n

The most striking detail is what drives those emissions. DoD said jet fuel combustion accounted for 80% of operational emissions and 50% of its total Scope 1 and Scope 2 emissions in FY2021. <\/p>\n\n\n\n

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The same report said DoD spent $3.3 billion in FY2021 to power, heat, and cool its buildings, a number that will feel familiar to anyone staring at a rising electric bill<\/a>.<\/p>\n\n\n\n

Decommissioning a nuclear carrier is an environmental and business test<\/h2>\n\n\n\n

Nimitz\u2019s trip is happening right as the Navy wrestles with timing and shipbuilding delays. <\/p>\n\n\n\n

Stars and Stripes reported that the carrier\u2019s retirement was delayed and that Nimitz is expected to remain active through March 2027 so the Navy can maintain a congressionally mandated minimum of 11 active aircraft carriers while the next Ford-class ship, USS John F. Kennedy, moves toward commissioning.<\/p>\n\n\n\n

What comes next is not just paperwork. A Government Accountability Office review of dismantlement planning for the first retired nuclear carrier, ex-USS Enterprise, warned that the effort may cost more than $1 billion and involves specialized handling of nuclear material, including preparing reactor packages for transport and disposal at the federal site in Hanford, Washington.<\/p>\n\n\n\n

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