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Spring Hill Manufacturing

Spring Hill Manufacturing is an automotive assembly plant located in , , owned and operated by , specializing in the production of luxury crossovers, SUVs, and electric vehicles on a flexible that accommodates both internal combustion and battery-electric models. The facility, spanning 2,100 acres including areas dedicated to farming and wildlife habitat, was established in 1985 on a former horse farm and officially opened in 1990 as the primary production site for ' Saturn brand. Following the discontinuation of the Saturn brand in 2009, the plant underwent a significant reconfiguration in 2011 to become an "ultra-flexible" manufacturing hub capable of producing diverse vehicle types. As of 2023, Spring Hill Manufacturing employs approximately 3,200 workers and encompasses 7.9 million square feet of production space, including metal stamping, painting, battery assembly, and a global propulsion systems plant that produces engines such as the 2.0-liter inline-four, 2.7-liter inline-four, and 5.3-liter V-8 for various General Motors models. Current vehicle production includes the Cadillac XT5, XT6, LYRIQ, and VISTIQ (production started in 2025), as well as the GMC Acadia, with plans to add the gas-powered Chevrolet Blazer starting in 2027 as part of a $4 billion investment in U.S. manufacturing plants announced in June 2025. In September 2025, GM announced temporary production adjustments at the plant, including reduced output for the LYRIQ and VISTIQ in December 2025 and single-shift operations from January to May 2026, in response to EV market demand. The plant's adaptability has been highlighted by its transition to electric vehicle production, notably with a $2 billion investment announced in 2020 to build the Cadillac LYRIQ on the BEV3 platform. Spring Hill Manufacturing plays a key role in General Motors' U.S. operations, contributing to the company's more than $60 billion investment in American manufacturing, R&D, and capital spending since 2020 and supporting over 1 million direct and indirect jobs nationwide. In 2020, General Motors partnered with Origis Energy to power the facility with 100 percent renewable solar energy starting in late 2022. The plant's innovations in flexible production have positioned it as a model for efficient, multi-powertrain manufacturing within the automotive industry.

Overview

Location and Facilities

Spring Hill Manufacturing is situated in , on a sprawling 2,100-acre site along Saturn Parkway, providing ample space for industrial operations and supporting . The facility's strategic positioning facilitates efficient logistics and connectivity within the region. Groundbreaking for the plant took place in 1986, with construction activities commencing shortly thereafter, leading to full operational status by 1990. The complex encompasses 7.9 million square feet of space, including dedicated assembly lines for vehicle body , stamping operations for metal forming, and specialized areas for to support advanced integration. This layout allows for streamlined workflows across multiple production stages. Key infrastructure elements enhance the site's efficiency, such as on-site rail access via a dedicated cross-dock for and transportation, served by CSX rail services. The plant's proximity to , just a short distance from the Saturn Parkway exit, supports seamless highway access for supplier deliveries and finished product distribution. Additionally, the facility incorporates flexible manufacturing modules designed to accommodate varied production needs. A distinctive feature of the is the shared capable of producing both and electric vehicles, a capability introduced in to enable mixed-model operations without dedicated line retooling. As a cornerstone of ' North American manufacturing network, Spring Hill's layout supports adaptable production strategies across vehicle types.

Capacity and Operations

Spring Hill Manufacturing operates with an annual production capacity of nearly 200,000 vehicles, featuring flexible lines capable of scaling to meet demand across multiple shifts. The facility employs a flexible manufacturing system that has enabled simultaneous assembly of internal combustion engine (ICE) and electric vehicles (EVs) on a single line since 2020, following a $2 billion investment to retool for EV production. Key operational processes at the plant include vehicle stamping, body shop assembly, painting, , and comprehensive quality testing, with advanced integrations such as for precision welding and material handling. incorporates AI-driven technologies and digital twins for enhanced and process optimization throughout its network to predict and prevent defects in . For EV production, the plant integrates the battery platform, assembling battery packs sourced from the adjacent Ultium Cells facility to support models from and other brands. The plant adheres to (UAW) standards as a unionized site under Local 1853, emphasizing worker safety with goals aligned to zero incidents through ergonomic designs and automated safeguards. Post-2020 upgrades have improved , including a transition to 100% via a 100-megawatt solar farm, supporting GM's broader sustainability targets. As GM's third U.S. site for production—following Factory ZERO in Detroit-Hamtramck and —Spring Hill plays a pivotal role in the company's , bolstering output for premium brands like .

History

Founding and Saturn Era

Spring Hill Manufacturing originated as the dedicated production facility for the , a wholly owned subsidiary of () established on January 7, 1985, to develop and manufacture compact vehicles aimed at rivaling imports in and affordability. The initiative stemmed from GM's broader in the early to revitalize its domestic operations amid competitive pressures, with initial R&D funding approved in 1982 and full commitment of $4.1 billion by 1985 for the new division. On July 31, 1985, Tennessee Governor announced the selection of a 2,400-acre site in Spring Hill, , for the plant, marking a significant economic coup for the rural area after a competitive bidding process involving multiple states. Construction milestones unfolded rapidly following the announcement, with excavation commencing in July 1986 on the expansive facility designed to encompass 4.3 million square feet of manufacturing space. To support logistics, the state-funded Saturn Parkway—a four-lane linking the plant to —was completed and officially opened in August 1989, facilitating efficient material transport and worker access. The plant's first vehicle, a Saturn S-Series sedan, rolled off the assembly line on July 30, 1990, initiating full-scale production under a highly automated and innovative system that emphasized . The facility's design philosophy centered on a pioneering team-based manufacturing model, forged through a unique labor agreement with the (UAW) ratified in July 1985, which granted union members substantial input in operations and eliminated traditional job classifications in favor of flexible, collaborative teams focused on quality and continuous improvement. This approach, distinct from standard practices, prioritized employee involvement and skill development over rigid hierarchies, aiming to foster a high-performance culture that could produce defect-free vehicles efficiently. From 1990 to 2007, the plant exclusively assembled Saturn-brand vehicles, including sedans and coupes from the S-Series lineup, midsize L-Series sedans and wagons introduced in 1999, compact SUVs like the Vue starting in 2002, and roadsters such as the Sky in 2006, all tailored to appeal to import buyers seeking reliable, user-friendly American alternatives. During its peak in the mid-1990s, the Saturn era at Spring Hill symbolized 's ambitious revival efforts, with employment surpassing 7,000 workers by 1993 after the addition of a third shift to meet rising demand, underscoring the plant's role as a beacon of industrial innovation and regional transformation. By the early 2000s, the workforce had grown to around 7,800, reflecting the facility's operational scale before broader challenges began to impact the division.

Post-Saturn Transition

The discontinuation of the Saturn brand marked a pivotal shift for Spring Hill Manufacturing, with the final Saturn Ion and Vue vehicles rolling off the assembly line on March 29 and 30, 2007, respectively. This ended dedicated Saturn production at the facility, which had been its primary focus since opening. Amid ' broader financial struggles, the company filed for Chapter 11 bankruptcy in June 2009, leading to the idling of the Spring Hill assembly plant by November of that year as part of restructuring efforts to consolidate operations and reduce excess capacity. The idling halted vehicle assembly, though powertrain operations continued on a reduced scale, contributing to significant uncertainty for the local economy. The retooling phase began in earnest following the bankruptcy, with GM announcing a $244 million investment in November 2011 to transform the idled assembly operations into a flexible "" plant capable of supporting multiple vehicle platforms. This initiative, part of the new four-year labor agreement with the Automobile Workers (UAW), aimed to enable rapid adaptation to varying production demands. Partial reopening occurred in late 2011, initially focusing on preparations for assembly, which commenced in September 2012 and helped restore operational momentum. From 2012 to 2015, the plant ramped up production of the , achieving peak output and demonstrating the success of the flexible manufacturing lines. In October 2015, the final Equinox rolled off the line, coinciding with announcements of full plant reopening and expanded capacity to support upcoming models like the Cadillac XT5, signaling a complete transition to mainstream vehicle production. The transition period presented notable challenges, including workforce reductions to approximately 600-1,100 employees during the idling phase as assembly halted and buyouts were offered. UAW negotiations during the 2009 and 2011 contract talks emphasized , resulting in no-layoff provisions for active workers and commitments to recall laid-off employees as production resumed, which added about 700 jobs initially. A key milestone in recovery came in March 2012, when the Spring Hill powertrain facility produced its 3-millionth engine, underscoring the plant's ongoing viability in engine manufacturing amid the broader efforts.

Electrification and Recent Developments

Between 2010 and 2019, invested more than $2 billion in Spring Hill Manufacturing to expand capacity and modernize operations, including the addition of stamping and injection molding facilities to support vehicle assembly and component production. In April 2016, GM announced an additional $788.7 million investment specifically for a new high-efficiency engine program and vehicle line updates, enhancing the plant's ability to produce mid-size SUVs like the XT5 and . These expansions transformed the facility into a more integrated manufacturing hub, incorporating on-site stamping for body panels and injection molding for plastic components, which improved efficiency and reduced reliance on external suppliers. In October 2020, GM committed $2 billion to retool Spring Hill for production, enabling the plant to build the Cadillac Lyriq on the battery platform while maintaining lines for vehicles. This investment marked a pivotal shift toward mixed-propulsion capabilities, with the Lyriq becoming the first EV assembled there starting in early 2022. The upgrades included modifications to assembly processes to handle high-voltage battery integration and Ultium-specific modular architecture, positioning Spring Hill as a key node in GM's strategy. From 2024 to 2025, Spring Hill achieved several electrification milestones, including the start of production in early 2024 through a partnership with , utilizing the platform for this all-electric luxury ; however, production ended in September 2025 after one . Production of the gasoline-powered concluded on November 7, 2025, with lines transitioning to the all-electric Vistiq three-row to further emphasize output. In July 2025, announced plans to convert battery cell lines at the adjacent facility for (LFP) production, with conversion beginning later that year to support lower-cost batteries, though full commercial output is slated for late 2027. Additionally, in October 2025, announced temporary layoffs of 710 workers at the adjacent facility starting January 5, 2026, amid slower demand. However, in December 2025, production of the Lyriq and Vistiq is scheduled to be temporarily suspended for one month to adjust operations amid market shifts and policy changes affecting incentives. Looking ahead, Spring Hill will add production of the gas-powered starting in 2027 as part of a broader $4 billion investment announced in June 2025 across U.S. facilities, balancing growth with internal combustion vehicle demand. This move relocates assembly from to Spring Hill, enhancing domestic capacity for both propulsion types. Over this period, Spring Hill evolved from its Saturn legacy into a central Cadillac EV hub, leveraging the platform to produce multiple battery-electric models and supporting GM's goal of an all-electric future for the luxury brand. The plant's flexible lines now accommodate Ultium-based vehicles like the Lyriq, Vistiq, and partner models, underscoring its role in GM's scalable electrification ecosystem.

Production

Current Vehicles

The Spring Hill Manufacturing plant in assembles several luxury SUVs as of late 2025, focusing on both internal combustion engine () and () models. The facility's flexible production lines enable the simultaneous manufacture of gas-powered and electric vehicles, supporting ' transition toward electrification while maintaining output for traditional powertrains. The XT5, a mid-size luxury crossover powered by a engine, continues to be produced on dedicated assembly lines at the plant. Introduced in its current generation in 2017, the XT5 features a 3.6-liter and is built for the North American market, with production confirmed to extend through 2025 and into subsequent years despite a temporary pause in December 2025 for retooling. This model represents Spring Hill's ongoing commitment to vehicles, utilizing the plant's stamping, , and painting operations tailored for crossover . The Cadillac Lyriq, an all-electric mid-size SUV based on ' battery platform, has been in production at Spring Hill since 2022, with retail assembly ramping up in 2023. The vehicle integrates battery packs produced on-site at the adjacent Ultium Cells facility, which supplies lithium-ion modules directly to the assembly line for seamless incorporation during the build process. As of 2025, the Lyriq accounts for a significant portion of the plant's output, though production is scheduled to be temporarily suspended in December 2025 amid market adjustments; U.S. deliveries reached 5,017 units in the second quarter alone, highlighting its role in Cadillac's luxury lineup. The Cadillac Vistiq, a three-row all-electric also on the platform, entered production at Spring Hill in early 2025, replacing the discontinued XT6 and expanding Cadillac's offerings for larger families. This model features dual-motor all-wheel drive and advanced integration similar to the Lyriq, with assembly leveraging the plant's shared lines for efficient scaling. Production ramp-up occurred amid broader strategy shifts, including a December 2025 pause, but the Vistiq is positioned for global sales starting in 2025. Overall, Spring Hill's operations emphasize adaptability, with shared assembly lines handling both and builds, and on-site facilitating direct integration for models like the Lyriq and Vistiq. In July 2025, announced plans to upgrade the Ultium Cells facility for (LFP) cell , with conversion starting later that year to support lower-cost EV batteries, though full commercial output is slated for late 2027. These adaptations underscore the plant's role in GM's efforts while sustaining volumes for established models.

Former Vehicles

The Spring Hill Manufacturing plant served as the primary production hub for Saturn vehicles from its opening in 1990 until 2007, assembling approximately 3.8 million units during this period. Key models included the S-Series sedans, coupes, and wagons, produced from 1990 to 2002, which were the first vehicles off the line and featured innovative dent-resistant body panels made from recyclable materials that minimized minor impacts like dings. The compact car followed from 2003 to 2007, continuing the panel tradition until its discontinuation with the Vue. The Vue compact crossover SUV, introduced in 2002, was built until March 2007 and represented Saturn's shift toward SUVs, with over 500,000 units produced at the facility using the same lightweight exteriors for improved and resistance. These models highlighted Spring Hill's role in pioneering plastic body construction, a Saturn hallmark that influenced later designs but was phased out after 2007. Following the end of Saturn production in 2007 and a period of idling, the plant resumed vehicle assembly in 2008 with the , a mid-size SUV that marked Spring Hill's first non-Saturn product, built from September 2008 to November 2009 before production shifted to . The facility idled again until 2012, when it reopened to produce the second-generation compact SUV starting September 2012, continuing until October 2015 as part of 's effort to meet demand for fuel-efficient crossovers. During this time, Spring Hill contributed to overall Equinox output, helping achieve annual volumes exceeding 200,000 units across GM plants. In 2017, the plant began assembling the second-generation GMC Acadia mid-size SUV, relocating production from Kansas City to Spring Hill to support a redesigned, more compact model; this continued through the 2023 model year until shifting to Lansing Delta Township to accommodate EV expansion at Spring Hill. The Cadillac XT6 luxury three-row SUV joined the lineup in 2020, emphasizing premium features and advanced safety systems, with production concluding on November 7, 2025, as part of GM's transition to electrification. Production transitions at Spring Hill often aligned with broader GM shifts, such as the 2021 downtime from October to December for retooling lines to support assembly, including preparations for models like the Cadillac Lyriq.

Components and Powertrain

Spring Hill Manufacturing produces a range of components, including engines from ' Ecotec family, such as the 2.0L turbocharged and 2.2L four-cylinder variants. The facility marked a significant milestone in March 2012 by assembling its 3-millionth Ecotec engine, which powered a 2013 Eco. These engines, known for their efficiency and durability, have been integral to various models. Since the mid-2010s, the plant's Global Propulsion Systems facility has manufactured propulsion systems for global distribution, supporting a diverse lineup of vehicles including SUVs and sedans. In addition to internal combustion engines, the plant has expanded into electric vehicle components with the on-site assembly of Ultium battery systems through the Ultium Cells joint venture with . Battery cell at the Spring Hill facility commenced in 2024, contributing to 's electrification strategy with an annual capacity of approximately 45 GWh. In July 2025, announced plans to convert battery cell lines to produce low-cost (LFP) cells, enabling cobalt-free technology and lower costs compared to nickel-based alternatives, with commercial output expected by late 2027. On October 29, 2025, Ultium Cells announced a temporary pause in battery cell starting January 2026 due to lower , with a planned resumption in mid-2026, affecting around 700 employees. The facility also manufactures other essential components, including stampings, injection moldings, and assembly modules tailored for GM's C1 platform crossovers such as the Cadillac XT5, XT6, and . Dedicated powertrain production areas at Spring Hill support multiple GM assembly plants across , ensuring a steady supply of components for both conventional and electrified vehicles.

Economic and Community Impact

Workforce and Employment

Spring Hill Manufacturing employs approximately 5,000 hourly and salaried workers across its vehicle assembly and battery production operations as of mid-2025, with the workforce represented by (UAW) Local 276 for the main plant and Local 1853 for the adjacent Cells battery facility. Recent temporary layoffs affecting approximately 700 workers at the site, scheduled for January to May 2026 due to retooling, highlight ongoing adjustments amid fluctuating demand for components. These layoffs are temporary and do not impact permanent employment, with providing benefits and retraining support during the period. Historically, the plant's workforce peaked at around 9,000 employees during the mid-1990s Saturn era, when it served as the hub for the innovative brand's production. Employment declined sharply during the 2008-2009 , with the assembly operations idling in late 2009 and reducing the active workforce from about 3,400 to minimal levels as part of ' bankruptcy restructuring. Post-2015, staffing grew steadily with the plant's transition to crossover and production, reaching approximately 4,100 by 2017 and expanding further with the addition of EV battery manufacturing, reflecting recovery and diversification efforts. Union agreements at Spring Hill trace back to the Saturn era's pioneering no-layoff policy, established in 1990 as part of a collaborative labor model that exchanged flexible work rules for guarantees. This team-based approach, featuring self-managed work teams and classless , originated in the plant's founding and influenced subsequent UAW-GM contracts, though temporary layoffs have occurred during economic downturns. Recent UAW agreements, including the 2023 national contract and the 2025 Cells local pact, incorporate provisions for EV-specific training to support the shift to electrification, ensuring workers receive upskilling opportunities amid industry changes. The plant offers comprehensive on-site training programs focused on , assembly, and safety protocols, integrated into ' broader apprenticeship initiatives in partnership with the UAW. These include hands-on retraining for robotic systems maintenance and battery production, with the agreement emphasizing an apprentice/upskilling program that draws on journeyperson expertise. Collaborations with local support formal apprenticeships, providing pathways for new hires to develop skilled trades in advanced . General Motors promotes diversity and retention at Spring Hill through company-wide initiatives aimed at gender balance, including targeted recruitment and leadership development for women in technical roles. Veteran hiring is a priority, with dedicated resources and job postings emphasizing support for military transitions into manufacturing positions at the facility. These efforts contribute to stronger employee retention, as evidenced by GM's focus on inclusive policies that have helped maintain workforce stability below broader industry turnover rates.

Investments and Local Economy

Since its reopening in 2010, has invested more than $2.3 billion in the Spring Hill Manufacturing plant, supporting expansions in vehicle assembly and engine production. In 2019, the company invested $300 million to produce XT6, enhancing capacity for crossovers and SUVs. This was followed by a $2 billion investment announced in 2020 to transition the facility toward production, including the Cadillac LYRIQ, marking a pivotal shift to . More recently, in June 2025, GM outlined a $4 billion company-wide reinvestment across U.S. plants, including significant allocations to Spring Hill for boosting output of both internal and electric models, contributing to a total exceeding $6 billion in commitments since 2010 when including joint ventures like the $2.3 billion Cells battery facility. These investments have generated substantial economic ripple effects in , with 's operations contributing approximately $3.3 billion to the state's GDP in 2022 alone through direct , supply chain activity, and related spending. The plant supports thousands of indirect jobs in the regional supply chain, fostering growth in , parts , and services across Maury and Williamson counties. partnerships further amplify this impact, as has donated land parcels to local schools, including tracts for educational facilities, and provided grants totaling over $75,000 annually to nonprofits supporting youth programs and infrastructure needs. Environmental initiatives tied to these investments include GM's broader zero-waste goals, with Spring Hill participating in programs to achieve landfill-free operations through and , aligning with the company's aim for sourcing by 2040. The facility also contributes to local , such as support for the Saturn Parkway, which facilitates efficient transport for suppliers and workers. The supplier benefits notably, with over 50 tier-one partners integrated on-site or in adjacent areas, enhancing efficiency and economic vitality in the region. Long-term, the plant's presence since 1990 has transformed Spring Hill from a rural community of about 1,500 residents into a thriving hub, driving to nearly 65,000 and significantly elevating property values—land prices rose from $1,500 per acre in the mid-1980s to current median home values exceeding $500,000. This evolution has positioned the area as a key node in Tennessee's automotive corridor, with sustained investments ensuring ongoing economic stability.

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