Environmental Sustainability｜Energy Management
Nuvoton actively reduce the environmental impact of our business operations by investing in innovative technologies and initiating layouts for renewable energy and net carbon zero emissions. We enhance resource use efficiency and implement waste management to respond to the continuously evolving international environmental regulations, extreme climate events, and other risks. By estimating financial impacts and planning management costs in advance, we formulate environmental strategies and build operational resilience for the company.
48.8
％
Approved SBTi Near-Term Target: Commitment to Reduce Scope 1 and 2 Emissions by 2030 Compared to the 2022 Baseline
25
%
Approved SBTi Near-Term Target: Commitment to Reduce Scope 3 Emissions by 2030 Compared to the 2023 Baseline
1163000
kWh
Nuvoton Taiwan's Annual Electricity Saving Achievement in 2024
Energy Management Policy and Commitment
To strengthen energy management and improve energy efficiency, Nuvoton has adopted the ISO 50001 Energy Management System and established a dedicated task force under the Sustainability Development Committee. The task force, composed of facility management and related departments, holds regular energy management meetings to review current status and project progress. It also shares project results and best practices with global sites to continuously achieve energy-saving goals.
Energy Usage Overview
Electricity is the primary energy source for Nuvoton Technology. In 2025, purchased electricity accounted for approximately 95% of total energy consumption at Nuvoton Taiwan, while the remaining energy consumption was mainly derived from natural gas and fuel for vehicles. In addition, Nuvoton Taiwan has installed onsite solar power systems for self-consumption, representing approximately 1.4% of total energy consumption.
For Nuvoton Japan, purchased electricity accounted for approximately 71% of total energy consumption, while the remainder was primarily derived from liquefied petroleum gas (LPG), heavy oil, natural gas, and other fuels. Nuvoton Japan also continued to increase its use of renewable energy through long-term renewable energy procurement under power purchase agreements (PPAs) and the acquisition of non-fossil energy certificates, accounting for approximately 5% of total energy consumption.
Energy Management Strategy
Nuvoton Taiwan and Nuvoton Japan obtained ISO 50001 Energy Management System certification in 2022 and 2023, respectively, and have adopted the P-D-C-A (Plan-Do-Check-Action) management cycle to continuously optimize energy management processes. Nuvoton focuses on three major approaches: the utilization of energy-saving equipment, the implementation of smart energy management, and the expansion of renewable energy and diversified energy strategies. The Company also reviews and updates its energy conservation improvement plans on a rolling annual basis.
- Utilization of energy-saving equipment: When replacing equipment, Nuvoton gives priority to high-efficiency models and continues to optimize the operation of compressed air, chilled water, air conditioning, pumping, and lighting systems.
- Smart energy management: Nuvoton has introduced energy management systems, energy monitoring, and AI-based control technologies to strengthen real-time data visibility and anomaly management for energy use.
Renewable energy and diversified energy strategies: Nuvoton continues to install onsite solar power systems for self-consumption, procure renewable energy and non-fossil energy certificates, and assess long-term power purchase agreements to increase the proportion of renewable energy use.
Energy-Saving Measures
2025 Action Summary
- Utilization of energy-saving equipment: Optimization of air compressor operations; replacement of cooling towers, LED lighting, vacuum pumps, energy-efficient pumps for process equipment, and air conditioning and chilled water system equipment.
- Smart energy management: Gradual establishment of energy monitoring and AI-based control capabilities, including the introduction of AI control into the chilled water system, real-time energy monitoring, and optimization of operational strategies.
- Renewable energy and diversified energy strategies: Onsite solar power generation for self-consumption at the Yanshin plant; introduction of purchased solar power, long-term renewable energy procurement, and non-fossil energy certificates at Nuvoton Japan sites.
Key Achievements
- Nuvoton Taiwan reduced total energy consumption in 2025 by 3.5% compared with the 2021 baseline year, while Nuvoton Japan reduced total energy consumption by 41.5% compared with the 2021 baseline year.
- Nuvoton Taiwan maintained 819 kW of solar power generation capacity, with annual electricity generation reaching approximately 1 million kWh in 2025.
- Starting from October 2025, Nuvoton Japan procured solar power through a PPA, with an expected annual green electricity supply of 7 million kWh. In 2025, Nuvoton Japan also procured 6.58 million kWh of non-fossil energy certificates, further increasing the proportion of renewable energy use.
- In 2025, Nuvoton's energy conservation measures achieved annual electricity savings of 5.16 million kWh, with total investment amounting to NT$46,912 thousand.
Nuvoton's Energy-saving Achievements in 20251, 2
| Company | Category | Initiatives | Investment Amount (k- TWD) | Electricity Savings (kwh/yr) | Electricity Savings (GJ/yr) |
|---|---|---|---|---|---|
| Nuvoton Taiwan | Smart energy management | Introduce AI control into the chilled water system | 740 | 730,000 | 2,628 |
| System load reduction | Optimization of air compressor operations | - | 51,264 | 185 | |
| Equipment replacement | Replace electric boilers with natural gas boilers (II phase) | 5,200 | 220,000 | 792 | |
| Replacement of cooling tower | 6,180 | 17,644 | 64 | ||
| Replacement of LED lighting (from 20W to 13W) | 350 | 30,600 | 110 | ||
| Replacement of dry vacuum pumps | 2,160 | 33,900 | 122 | ||
| Replacement of Chiller Unit for Etching Equipment | 5,375 | 69,900 | 252 | ||
| Energy-efficient Pumps for WCVD Process Equipment | 2,250 | 37,595 | 135 | ||
| Energy-efficient Pumps for Process Equipment | 2,160 | 37,500 | 135 | ||
| Replacement of high-vacuum Unit with Variable Frequency Drive (VFD) | 3,580 | 82,000 | 295 | ||
| Replacement of Fresh Air Conditioning System | 4,990 | 7,000 | 25 | ||
| Heat Exchanger Replacement | 1,300 | Scheduled to commence in 2026, expected to reduce 28,000 kWh annually | Scheduled to commence in 2026, expected to reduce 101 GJ annually | ||
| Chilled Water Pump Replacement | 1,900 | Scheduled to commence in 2026, expected to reduce 15,000 kWh annually | Scheduled to commence in 2026, expected to reduce 54 GJ annually | ||
| Renewable energy | Continuation of solar power generation initiatives in Yanshin plant | 180 | 1,028,683 | 3,703 | |
| Sub-Total | 33,165 | 2,346,086 | 8,446 | ||
| Nuvoton Japan | Smart energy management | Arai: Optimize ice water temperature setting of chiller system | - | 80,645 | 290 |
| System load reduction strategies | Uozu: Reduction in the number of operating air conditioning units | - | 19,274 | 69 | |
| Arai: Integration of production lines in building B | 10,357 | 658,451 | 2,370 | ||
| Arai: Closure of employee dormitory | - | 200,114 | 721 | ||
| Equipment replacement | Nagaokakyo, Uozu, and Arai: Replacement of LED lighting systems | 3,390 | 423,581 | 1,525 | |
| Introduction of renewable energy | Procurement of solar energy | - | 1,433,625 | 5,161 | |
| Sub-Total | 13,747 | 2,815,690 | 10,136 | ||
| Total | 46,912 | 5,161,776 | 18,582 | ||
Nuvoton's Energy-Saving Targets and Actions
| Strategies and Content | Short-Term Goals (2026) | Mid- and Long-Term Goals (2030) | ||
|---|---|---|---|---|
| Nuvoton Taiwan | Nuvoton Japan | Nuvoton Taiwan | Nuvoton Japan | |
| Utilization of Renewable Energy | Completion of applications for green electricity certificates associated with existing self-generated solar energy facilities | Procurement of 6,941,295 kWh of solar power | Renewable energy is projected to account for 1.5% of total electricity consumption at Taiwan | Annual procurement of 11,821,817 kWh of solar power |
| Enhancement of Energy Efficiency | Target a 6% reduction in electricity consumption compared to the 2021 baseline | Target a 1% annual reduction in energy and resource intensity compared to the previous year | Target a 10% reduction in electricity consumption compared to the 2021 baseline | Beginning in 2025, established a target to reduce energy and resource intensity by 1% annually over a five-year period,measured against the previous year's baseline |
Nuvoton Energy Consumption and Intensity by Region (2023-2025)
Electricity Saving Amount and Proportion Over the Past Three Years
Nuvoton Taiwan
| Nuvoton Taiwan | Unit | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| Purchased Electricity Consumption | GJ | 258,670 | 256,485 | 250,168 |
| Cumulative Electricity Savings (vs. 2021) | GJ | 8,256 | 10,441 | 16,758 |
| Reduction Rate (vs 2021) | % | 3.09 | 3.91 | 6.28 |
Nuvoton Japan
| Nuvoton Japan | Unit | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| Purchased Electricity Consumption | GJ | 450,691 | 406,554 | 408,708 |
| Cumulative Electricity Savings (vs. 2021) | GJ | 106,175 | 150,312 | 148,158 |
| Reduction Rate (vs 2021) | % | 19.07 | 26.99 | 26.61 |