Two companies announced a similar direction from different starting points

Samsung SDI and SK On discussed repurposing production capacity designed for electric-vehicle batteries for energy-storage-system (ESS) demand on October 29. Samsung SDI reported third-quarter revenue of KRW 4.6856 trillion and operating profit of KRW 407.8 billion. SK On reported revenue of KRW 1.5263 trillion and an operating loss of KRW 80.5 billion.

Those figures reflect different company scopes and portfolios; they are not a direct test of whose ESS conversion strategy is better. Samsung SDI has secured more than 60 GWh of ESS orders through October and started LFP cell manufacturing at one US plant. SK On emphasized using existing EV lines before committing capital to new plants.

Under the shared label 'EV-to-ESS conversion', one line is already producing, others are being converted and some capacity remains a design or scheduling plan. Reusing physical assets is not the same as delivering a qualified new battery product at scale.

Samsung SDI is producing; SK On is managing the scope of conversion

Samsung SDI began producing high-capacity prismatic LFP cells for ESS at its StarPlus Energy (SPE) factory in Indiana in early October 2026. Cell shipments began mid-month, and deliveries of fully assembled Samsung Battery Box (SBB) systems are planned for December. Two more SPE lines are expected to enter phased production in the first half of 2027.

The SynergyCells site is a separate longer-term project. Originally designed around EV production, it is undergoing design optimization for next-generation ESS LFP products, with a possible manufacturing start between the second half of 2028 and early 2029. That project should not be described as operating today.

On the same day, SK Innovation said SK On would prioritize the stepwise conversion of Korean and US EV battery capacity rather than first building additional ESS factories. Actual conversion scope depends on orders, customer schedules and qualification. The approach differs from a line that has already begun commercial production.

Chemistry and production conditions don't convert automatically

Using existing EV manufacturing infrastructure may avoid some greenfield costs. But LFP cathode chemistry differs from high-nickel ternary cells, and the final product's electrical, safety and lifetime specifications can also be different.

Electrode production, cell assembly, formation, equipment settings, yield stabilization and quality inspection need review against the new product's requirements. Some machinery may be adaptable, but neither company has shown that every line and every machine can switch without modification.

The investment test is therefore more than the percentage of equipment reused. How much engineering work and validation are required, how quickly does the line reach target yield, and what customer qualification is required before orders become deliverable output? Public disclosures do not permit a precise calculation of all conversion costs.

Cell supply and integrated ESS product supply are different contracts

Samsung SDI sells not only battery cells but also integrated ESS solutions built around modules and battery boxes. Its new LFP cells are part of the planned December SBB deliveries. Yet Samsung SDI does not use LFP across every ESS product: an October 26 contract with US customer AlphaOmega Power covers 1.5 GWh in total of SBB 1.7 with high-nickel NCA cells.

SK On's signed NeoVolta Power arrangement, by contrast, is for 9 GWh of LFP pouch battery cells to be supplied from 2027 through 2031. The partners have discussed a separate additional 9 GWh supply-and-pack arrangement, but that proposal must not be counted as signed contracted volume.

Delivering a qualified cell and delivering a functioning ESS system require overlapping but different skills. Packaging, battery-management systems, thermal management, fire testing, field safety, application-specific certification and logistics may be necessary at different supply-chain stages. UL 9540A and NFPA 855 relate to different testing and installation requirements.

Material supply changed alongside manufacturing plans

In March, Samsung SDI announced a roughly KRW 1.6 trillion LFP cathode supply deal with Korean materials supplier L&F, covering three years starting in 2027 plus an additional priority-supply option. The material is intended for ESS production at SPE.

In September, SK On signed a separate roughly KRW 161.7 billion LFP cathode materials contract with L&F, with its disclosed term extending to the end of 2028. These agreements differ by duration, volume structure and sourcing scope and cannot be converted into an ESS market-share ratio based on their currency values.

Both companies are aligning raw-material procurement with production transitions. But contracting with a Korean supplier does not establish that every raw input and production stage is outside China. Traceability and any applicable North American sourcing conditions need product-specific confirmation.

60 GWh of orders and a 9 GWh contract are not equivalent metrics

Samsung SDI's reported 60+ GWh represents its ESS order intake through October 2026. Management said the current order base could support high utilization at its SPE and Ulsan facilities through 2028. SK On's 9 GWh is a single identified NeoVolta customer agreement scheduled over five years, 2027–2031.

It is invalid to divide those two figures as if they covered the same time horizon and client base. It is also invalid to assign the entire Q3 earnings difference to an October production shift: the financial quarter ended in September, before the new US LFP ramp began.

Actual delivery milestones, conversion ramp-up, equipment utilization, yield and contractual margin will provide better evidence of how each strategy performs. The numbers are useful only after their reporting scope is kept intact.

The first talent question is capability transfer, not automatic hiring growth

Neither company specified a hiring increment attributable to these conversion plans in its October 29 announcements. Existing assets and workers may be redeployed, while some engineering skills may have to be added. The public evidence does not support a guaranteed jobs boom or headcount reduction.

Skills in electrode processing, cell assembly, production equipment, quality systems and yield improvement may transfer to LFP lines after appropriate validation. Other roles may center on modules, battery management, thermal control, safety qualification, customer specifications and supply chain traceability. These are capability areas, not verified increases in specific job postings.

For an employee considering a move from EV batteries to ESS, the key is to identify which process expertise remains valuable, where product chemistry changes validation requirements, and whether the employer sells cells or integrates systems. That maps experience to actual business needs more precisely than the headline 'ESS is growing'.

The value of an EV factory may depend on its adaptability

When electric-vehicle demand was rising, expanding installed battery capacity was a major competitive goal. These October 2026 decisions illustrate another question: how effectively can an existing production asset serve a different market when the original demand outlook changes?

Success should be judged by the start of qualified output, yield and cost, sourcing readiness, safety approvals, system deliveries and the ability to satisfy customer schedules. It may also be important whether equipment converted for ESS could be redirected again if EV demand changes.

Samsung SDI and SK On are not at identical stages of implementation, but they face a common capital-allocation problem. Manufacturing advantage increasingly involves the ability to redeploy equipment, engineering skills and supply agreements into products that customers actually buy.

BANSEOG VIEW

BANSEOG VIEW | Reusing a factory is not the same as reusing a full manufacturing capability

Samsung SDI is already producing US LFP cells and plans two further line conversions; SK On is prioritizing existing EV capacity in response to ESS orders. The starting conditions and products contracted for delivery differ.

Equipment reuse is only one input. New chemistry, raw materials, production validation, safety requirements and the hand-off from cells to finished ESS systems determine how much of an existing factory's capability truly transfers.

Announcements do not establish net new jobs. Industrial talent strategy should separate competencies that existing teams can carry over from those requiring new validation and customer-specific experience.

SOURCES

Primary sources and references

Published Oct 30, 2026. Samsung SDI Oct 29 Q3 earnings revenue KRW 4.6856T, profit KRW 407.8B, ESS orders >60GWh through October, SPE LFP production in October, SBB deliveries planned Dec, two lines phased H1 2027; SynergyCells future 2028H2–early 2029. SK On Q3 revenue KRW 1.5263T, loss KRW 80.5B and preference for converting existing EV lines are reported in SK Innovation 3Q call. NeoVolta signed 9GWh 2027–2031, proposed additional 9GWh not binding. Samsung SDI AOP ESS contract with NCA SBB 1.7 is distinct. Samsung SDI and SK On L&F cathode contracts of ~KRW 1.6T and ~KRW 161.7B differ in term. Neither exact conversion costs, yield, material country of origin nor hiring counts are confirmed; cross-company profit attribution to October conversions is not warranted.