About us
Our history
The Energy Controls Group collectively specialise in the design, build and customisation of LV/MV metering, protection, and power transformers. Supplying network and electrical companies worldwide since 1910.
Our Head Office is based in Christchurch, New Zealand and our test laboratories are located within our manufacturing facilities in both Australia and New Zealand.
Both Laboratories are ISO/IEC 17025 accredited to NATA & IANZ and are signatories to the ILAC Mutual Recognition Arrangement (ilacMRA). TWS Energy Controls is also a Class A EIPC certified test laboratory under the Electricity Authority.
IANZ/NATA endorsed test certificates provide assurance that the tests were carried out by an ISO/IEC 17025:2017 accredited test laboratory which meets the requirements for competent, impartial and consistent operation. The test equipment is fully traceable, and uncertainties have been applied.
1981
Transformer and Coil Winding Services as we were known then was founded, manufacturing small power transformers and chokes for power and audio applications.
1988
Acquisition of the instrument transformer designs manufacturing and testing equipment from New Zealand Transformers (Teleco).
1990
Acquisition of B R Homersham Ltd “Secura brand”.
1998
Transformer and Coil Winding Services became Transformer and Coil Systems when the company ownership changed.
2001
The company name was shortened to Transformer Winding Services Ltd and known as “TWS”.
2010
Acquisition of WF Energy Controls which was founded in Sydney in 1910 as Warburton Franki.
2012
Acquisition of Circle-C Transformers which was founded in Sydney in 1950 as Cadwallader Engineering.
2013
The Energy Controls Group was formed comprising of three companies, TWS Energy Controls, WF Energy Controls and Circle-C Transformers within Australasia.
2024
The Group falls under new ownership, ushering an exciting new beginning. Circle-C now operates independently.
1981
Transformer and Coil Winding Services as we were known then was founded, manufacturing small power transformers and chokes for power and audio applications.
1988
Acquisition of the instrument transformer designs manufacturing and testing equipment from New Zealand Transformers (Teleco).
1990
Acquisition of B R Homersham Ltd “Secura brand”.
1998
Transformer and Coil Winding Services became Transformer and Coil Systems when the company ownership changed.
2001
The company name was shortened to Transformer Winding Services Ltd and known as “TWS”.
2010
Acquisition of WF Energy Controls which was founded in Sydney in 1910 as Warburton Franki.
2012
Acquisition of Circle-C Transformers which was founded in Sydney in 1950 as Cadwallader Engineering.
2013
The Energy Controls Group was formed comprising of three companies, TWS Energy Controls, WF Energy Controls and Circle-C Transformers within Australasia.
Our product portfolio includes:
- Current Transformers up to 36kV
- Voltage Transformers up to 36kV
- LV Chokes/ Inductors (0.8 Power Factor included)
- Time Switches (via WF Energy Controls)
- Oil-filled HV Units up to 36kV
- Transformer MDI/Monitoring (via WF Energy Controls)
- Power Transformers up to 100kVA