For nearly four decades, TWS Energy Controls has been quietly underpinning New Zealand’s electricity infrastructure, delivering precision-engineered instrument transformers and metering solutions that safeguard accuracy, safety and reliability across the power network. Operating from its Christchurch facility, the company designs and manufactures current and voltage transformers for metering and protection applications up to 33 kV, trusted by utilities, OEMs and consulting engineers throughout Australasia. “Every instrument transformer we produce is designed, manufactured and tested entirely under one roof,” says Managing Director Jason Hew. “That approach gives our customers complete traceability, faster turnaround, and confidence that every unit leaving our facility meets the highest technical and quality standards.” Founded in 1981 as Transformer and Coil Winding Services, TWS has grown through decades of innovation and strategic acquisitions. Today, it operates alongside its Australian sister company, WF Energy Controls, together representing more than 150 years of combined transformer manufacturing heritage. Central to this capability is TWS’s in-house testing laboratory, accredited to ISO IEC 17025 and operating within an ISO 9001 quality management system, providing independent verification of every test conducted. “Accreditation isn’t just a certificate on the wall,” explains Jason. “It demonstrates that our testing is consistent, impartial and aligned with internationally recognised standards. Utilities rely on these results for critical metering and protection functions.” TWS’s Class A IANZ-accredited laboratory, a signatory to the International Laboratory Accreditation Cooperation Mutual Recognition Arrangement (ILAC MRA), provides that assurance. Each instrument transformer is tested in accordance with IEC 61869 and AS 61869 requirements, with endorsed certificates confirming that testing has been completed by a fully accredited laboratory. The company’s customer base includes many of New Zealand’s key electricity industry participants, such as Transpower, Genesis, Vector and Orion. Independent customer feedback reflects this trust, with 87 percent of clients rating product quality at the highest level and 83 percent rating overall reliability. “These results tell us we’re delivering what matters,” says Jason. “We’re not the cheapest option in the market, but we are dependable. In the energy sector, accuracy and reliability are nonnegotiable.” That dependability is reinforced by a fully integrated design-and-build model. Because TWS controls the entire process from raw materials through to final testing, it can deliver bespoke solutions ranging from compact low-voltage units to oil-filled high-voltage assemblies up to 36 kV. The same vertical integration allows the company to service, test and recertify equipment directly from its Christchurch workshop. Speed of delivery has also become a defining advantage. “When customers face urgent requirements, we can move from concept to completion far faster than imported alternatives,” says Jason. “Local manufacturing gives us flexibility, reduces downtime, and helps get critical infrastructure back online sooner.” Beyond engineering capability, TWS places strong emphasis on long-term partnerships. “Our business is built on people, performance and trust rather than branding alone,” explains Jason. “Customers deal directly with the engineers who design and test their transformers. That level of transparency and accountability is increasingly rare.” As demand grows for accurate, locally manufactured energy-measurement solutions across Australasia, TWS continues to expand its product range and testing capability. Yet its core mission remains unchanged: delivering high-quality, bespoke transformer solutions on time, every time. “In an increasingly automated world, precision still relies on craftsmanship,” says Jason. “That principle has guided TWS from the beginning and it’s why our customers continue to return.” Engineering accuracy into every amp
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