Company · Quality

Quality & Certifications

Occupational health and safety, quality and environmental protection at WT Energiesysteme have been verified by independent auditors – not merely claimed, but certified and documented as evidence. Our Integrated Management System has been successfully recertified by TÜV SÜD in 2026 in accordance with the DIN EN ISO 9001, ISO 14001 and ISO 45001 standards for quality, environmental protection and occupational safety. In addition, we hold SCC certification for occupational safety on construction sites and EcoZert 2026, a certification for sustainable corporate management.

WT Energiesysteme employee during occupational safety and rescue-from-height training, practicing the rescue of an injured person using a training dummy and specialized safety equipment.

Details

Details of the certificates

  • ISO 9001:2015 – Reg. No. 12 100 52097 TMS (19 June 2026–25 May 2028)

  • ISO 14001:2015 – Reg. No. 12 104 52097 TMS (valid until 14 April 2029)

  • ISO 45001:2023 – Reg. No. 12 117 52097 TMS (valid until 24 June 2027)

  • SCC*

Certification to DIN EN ISO 9001, ISO 14001 and ISO 45001 is confirmed by regular external audits.

EcoZert 2026: outstanding sustainability (ESG)

Creditreform’s 2026 EcoZert award recognises sustainable practices in environmental, social and corporate governance matters, as well as economic stability – including, amongst other things, a creditworthiness index of better than 299 and a balance sheet rating of better than CR11. Valid until June 2027.

CrefoZert 2026: excellent credit rating and financial strength

Creditreform’s CrefoZert 2026 certifies excellent creditworthiness, impeccable business conduct and a positive outlook for the future – based on a balance sheet rating between CR1 and CR8, current annual accounts and a personal interview regarding the company’s economic prospects. Only around two per cent of German companies meet these criteria. Valid until April 2027.

QEHS

Our Quality, Environment, Health and Safety (QEHS) management system: continuous improvement and review

Our integrated management system for quality, the environment, health and safety (QEHS) is regularly audited by external auditors. The most recent audit was completed without any major or minor non-conformities – solid evidence of an effective, systematically maintained quality management system.

Health and Safety at Work

Workplace safety in practice: ‘Climb and Rescue’

Safety is an integral part of our corporate culture. In addition to the annual compulsory training courses, we regularly practise ‘climbing and rescue’ – high-altitude rescue on masts and overhead lines under realistic conditions – particularly for new colleagues. In addition, we offer preventative measures such as high-quality PPE, health and skin checks, and driver safety training.

We practise climbing and rescue operations in addition to our annual training sessions – including for our new colleagues – in order to consolidate and repeat the procedures.

Oliver Schille

Bereichsleiter Energieanlagenbau, WT Energiesysteme GmbH

As a group of companies, we support projects across the entire energy infrastructure value chain. This requires reliable processes, the highest quality standards and sustainable practices. Our renewed certifications and the EcoZert accreditation confirm precisely this commitment.

Ralph Nickstadt

CFO, WT Energiesysteme GmbH

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View certificates

All certificates available for reference: ISO 9001, ISO 14001, ISO 45001, as well as the EcoZert and CrefoZert certificates. 

Frequently Asked Questions

Frequently asked questions about quality and certifications

Our quality management system is certified to the DIN EN ISO 9001 standard, supplemented by ISO 14001 (environmental management) and ISO 45001 (occupational health and safety) – audited and certified by TÜV SÜD.