Automotive Integrated Starter Generator Units Market to Reach CAGR 8,9% by 2031 Top 10 Company Globally

Integrated Starter Generator (ISG) units combine the functions of a starter motor and an alternator into a single electric motor-generator assembly. Often paired with mild-hybrid (48V and above) systems, ISGs enable features such as start-stop, regenerative braking, torque assist, and engine-off coasting. They contribute to fuel efficiency, reduced CO2 emissions, and improved drivability. As global automakers shift toward electrification and tighter emission mandates, ISGs have become a critical transitional technology bridging conventional powertrains and full hybrid or electric vehicles.

In 2024, the global automotive ISG market was valued at roughly USD 5,210 million, estimate steady growth at a Compound Annual Growth Rate (CAGR) of around 8,9% from 2024 to 2031, resulting in expected market value approaching USD 9,564 million by 2031. These figures align with broader mobility trends in electrified powertrains: mild-hybrid penetration is growing rapidly, especially in regions implementing aggressive fuel economy regulations.
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Latest Trends and Technological Developments
On May 2025, Valeo launched a new 48V ISG unit with 15 kW peak power and integrated thermal management, tailored to Chinese and Indian midsize SUVs. Preceding that, in late 2024, Bosch announced its lightweight ISG optimized for European and Korean city cars, weighing 25% less and reducing fuel consumption by up to 8%. In June 2024, Continental introduced a modular ISG platform with power-tailored variants (12 kW, 20 kW), suitable for component sharing across global platforms. These advances reflect rapid feature convergence and cost optimization in ISG technology.
Asia-Pacific dominates global ISG adoption, accounting for over 45% of unit sales in 2024 approximately 27 million units driven by strong uptake in China (where mild-hybrid vehicles comprised 42% of new light vehicle registrations), Indias rapid transition to fuel economy norms, and South Koreas export-oriented electrified vehicle production. OEMs such as Geely, BYD, Hyundai/Kia, and MG all offer ISG-equipped model lines. Local suppliers like YAFA, BorgWarner (China JV), and BYDs in-house powertrain teams have captured major share.

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Automotive Integrated Starter Generator Units by Type:
Belt Driven Integrated Starter Generator

Crankshaft Mounted Integrated Starter Generator

Dual Clutch Transmission Integrated Starter Generator

Others

Automotive Integrated Starter Generator Units by Application:
Passenger Vehicles

Commercial Vehicles

Others

Global Top 10 Key Companies in the Automotive Integrated Starter Generator Units Market
Robert Bosch GmbH

BorgWarner Inc.

Continental AG

Valeo SA

Denso Corporation

Mitsubishi Electric Corporation

Hitachi Astemo

Magna International

SEG Automotive

ZF Friedrichshafen AG

Regional Insights
In Southeast Asia (Indonesia, Thailand, Malaysia, Vietnam, Philippines), ISG adoption is at an early stage, accounting for roughly 5-7 million units in 2024 (about 812% global share). Automotive production hubs like Thailand and Indonesia have begun to include ISG as optional equipment on compact sedans and SUVs following new fuel-efficiency standards. Annual growth in the region is robust estimated at 1214% CAGR driven by OEM manufacturing localization and rising consumer interest in mild-hybrid benefits. However, volumes remain smaller due to limited regulatory push and price sensitivity.
Automotive Integrated Starter Generator Units by Region:
North America
Europe
China
Japan
India
South East Asia

The ISG segment must navigate cost pressures: while ASPs have declined with volume, they remain sensitive to raw material prices particularly rare-earth magnets and electronic-grade silicon. Integration complexity with engine control units and transmission systems raises calibration challenges, especially for retrofitting mature markets. In Southeast Asia, limited technical support infrastructure and warranty systems hinder aftermarket or retrofit deployments. Regulatory inconsistency across ASEAN nations also complicates product standardization.
Manufacturers should focus on scalable 48V modular platforms to serve both low-cost and premium segments. Establishing production or assembly hubs in Thailand, Indonesia, or Vietnam can reduce logistics costs and cement OEM partnerships. Collaborating with vehicle OEMs to co-develop ISG calibrations for driver comfort and fuel economy enables product differentiation. Creating service training programs and support channels in Southeast Asian markets will build confidence in the technology. Leasing or bundled longlife warranties can help overcome price-related adoption barriers.

Product Models
Integrated Starter Generator (ISG) units are essential components in modern hybrid vehicles, enabling start-stop functionality, regenerative braking, and mild hybrid propulsion. These systems combine the functions of a traditional starter motor and alternator into a single compact electric machine, improving fuel efficiency and reducing emissions.
Belt-Driven ISG (B-ISG) systems which are mounted externally and drive the crankshaft via a belt. Notable products include:
Valeo 48V Belt Starter Generator (iBSG): Designed for mild hybrid vehicles, it supports regenerative braking and engine restarts with minimal vibration.
Continental 48V Belt ISG: Enables stop-start and torque boost functions with minimal impact on existing engine layout.
Bosch B-ISG 48V System: Compact and efficient, widely used in European mild hybrid passenger vehicles for improved urban fuel economy.
Denso 12V Belt ISG: Used in compact cars, offering cost-effective start-stop functionality and modest power recovery.
Hitachi Astemo ISG-B System: 48V belt-driven unit providing fuel savings and emission reduction in compact sedans and crossovers.
Crankshaft-Mounted ISG (C-ISG) systems which are directly attached to the engine crankshaft and offer better torque respons. Examples include:
Bosch eISG (Crankshaft-mounted): Delivers strong torque for launch assist and energy recovery with direct crankshaft coupling.
Valeo Crankshaft ISG: Provides higher power density and faster response than belt-driven systems in MHEV platforms.
ZF eISG Crankshaft System: Integrates directly into engine housing, suitable for longitudinal engine configurations.
Denso Crank ISG Module: Combines high-speed engine starting and acceleration assist in premium hybrid sedans.
Hyundai Mobis e-ISG Crankshaft Unit: Used in next-gen Kia and Hyundai vehicles with higher torque demands and fast gear transitions.
Dual Clutch Transmission ISG (DCT-ISG) systems which are integrated into dual-clutch transmissions to provide seamless hybrid driving performance. Products examples include:
Hyundai Mobis DCT-ISG Unit: Integrated into Hyundais 7-speed DCT for seamless hybrid transitions and clutchless electric drive.
BorgWarner DCT Integrated Motor Generator: Provides silent start and hybrid torque support inside the transmission casing.
Getrag eDrive DCT-ISG: Transaxle-mounted ISG used in performance-oriented hybrids with dual motor control.
Magna DCT Integrated ISG Module: Provides electric torque smoothing and reduced emissions in multi-speed hybrid transmissions.
Eaton DCT-ISG Architecture: Compact motor system for commercial vehicle hybrid DCTs, enabling start-stop and regen braking.
The global automotive ISG market valued at around USD 5,210 million is expected to nearly double by 2031, driven by mild hybrid adoption, fuel efficiency mandates, and electrification trends. Asia-Pacific continues as the growth engine, particularly China, India, and Korea, while Southeast Asia offers emerging opportunities. Technological advances in output, weight, and modularity underpin the ISG market's transformation, with cost, complexity, and infrastructure limitations as ongoing constraints.

Investor Analysis
ISG technology is a growing intersection of mobility electrification and nearterm emissions strategy, delivering a midsize market USD 5,210 million in 2024 with strong volume trajectory 8,9% CAGR.
Investors can target supply chain players expanding regional assembly in Southeast Asia, platform licensing agreements with OEMs, or equity in modular ISG innovators. Partnerships that support aftermarket service networks or bundled system financing offer pathways to higher returns.
ISG technology is fundamental to global EV transition strategies, permitting nearterm powertrain efficiency gains with modest electrification cost. Early investment in globally relevant platforms and regional deployment positions stakeholders at the forefront of automotive energy transition, especially across Asia-Pacific where demand and regulation align.
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5 Reasons to Buy This Report
Clear sizing of global ISG demand and value dynamics through 2031.
Regional breakdown with special emphasis on fast-growing Asia and ASEAN markets.
ASP and unit shipment data enable financing and pricing analysis.
Up-to-date insights on technology launches and platform-level strategic moves.
Competitive intelligence on global and regional ISG suppliers and OEM partnerships.
5 Key Questions Answered
What was the total global ISG market size in 2024 in value ,shipments, and ASP?
What are the projected growth rate and market value through 2031?
How do ISG adoption trends differ between Asia-Pacific and Southeast Asia?
What recent technology launches are shaping future ISG design and performance?
Who are the leading ISG system suppliers and what are their regional strategies?
Chapter Outline
Chapter 1: Introduces the report scope of the report, executive summary of different market segments (by region, product type, application, etc), including the market size of each market segment, future development potential, and so on. It offers a high-level view of the current state of the market and its likely evolution in the short to mid-term, and long term.
Chapter 2: key insights, key emerging trends, etc.
Chapter 3: Manufacturers competitive analysis, detailed analysis of the product manufacturers competitive landscape, price, sales and revenue market share, latest development plan, merger, and acquisition information, etc.
Chapter 4: Provides profiles of key players, introducing the basic situation of the main companies in the market in detail, including product sales, revenue, price, gross margin, product introduction, recent development, etc.
Chapter 5 & 6: Sales, revenue of the product in regional level and country level. It provides a quantitative analysis of the market size and development potential of each region and its main countries and introduces the market development, future development prospects, market space, and market size of each country in the world.
Chapter 7: Provides the analysis of various market segments by Type, covering the market size and development potential of each market segment, to help readers find the blue ocean market in different market segments.
Chapter 8: Provides the analysis of various market segments by Application, covering the market size and development potential of each market segment, to help readers find the blue ocean market in different downstream markets.
Chapter 9: Analysis of industrial chain, including the upstream and downstream of the industry.
Chapter 10: The main points and conclusions of the report.

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