Our company portrait

Independence as a guiding principle

We take the liberty of looking after you honestly and independently of manufacturers - and are happy to answer all your questions about our work.

NTC in figures


Established in




Systems with service agreements


MW of UPS power sold (as of 2017)

Our history

NTC was founded by Klaus Clasen in Ahrensburg by Hamburg in 1996, under the original name of Notstromtechnik-Clasen GmbH. The dynamic entrepreneur built up his firm with great skill and enthusiasm, not to mention rolled-up sleeves, and has continued to advance it ever since. His commitment, drive and know-how in turning technical problems into implementable projects was much appreciated by customers and employees alike. Right from the start. It was not long before we became an in-demand partner for secure, high-availability power supplies. Independent of manufacturers, holistic and highly professional.

Our philosophy

One for all. And all for one.

For us, team spirit is a factor that belongs at the top of the agenda. Our employees enjoy an outstanding working atmosphere that can often even be sensed by our customers. So it is no surprise that many of our employees have been with us for ten years or more. This is a source of great joy for us and our customers alike. Because continuity results in certainty, both in terms of consultancy and support. This kind of certainty cannot be taken for granted these days, and it is part and parcel of our service.

Together for our customers

We now have more than 90 staff working on the premises and in the field, ensuring that all our projects run as smoothly as possible. You will find them at our head office in Ahrensburg as well as in our branch offices in Frankfurt and Hannover. You will also find them at our service points in Bavaria, North Rhine-Westphalia and Berlin. As a result, our customer list reads like a who’s who of German data centres, telecommunications suppliers, and industrial, scientific & administrative names.

Of course we are very glad that we are meanwhile one of the leading suppliers in the country for high-availability, uninterruptible, energy-efficient emergency power supplies. But what is more important to us is that we continue to be able to satisfy our customers in Germany, Austria and Switzerland.

Our claim

We offer complete solutions, create added value, and take all eventualities into consideration. This is how we are able to realise a reliable, custom-tailored emergency back-up power supply for each and every customer – from the initial concept to the implementation phase and on to monitoring ongoing operations.

Our declaration of independence

It is a central principle of our work that we are be able to provide our customers with independence from the public mains supply and in this way to maximise their supply security. Which is why we are ourselves independent. We have taken the conscious decision to be able to choose freely from any equipment and component manufacturer anywhere in the world and to operate without exclusive contracts. This enables us to configure systems that can be systematically adapted to your needs and requirements in terms of their size, power output, cost, design and form. And we can do this without restricting ourselves to products from any particular supplier.

Our partner links

We have been operating in our sector for many years, furthering developments and supporting lively exchanges.

Bitkom – Germany’s digital association

Bitkom is Germany’s digital association. It was formed in Berlin in 1999 through a merger of several individual industrial associations, and meanwhile represents more than 2,600 companies in the digital economy, including more than 1,000 SME companies, over 500 start-ups, and virtually all global players.


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