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NRG S1 Anemometer

The NRG S1 Anemometer is a class 1 sensor that reduces measurement uncertainty and project cost for wind resource assessment and power performance testing.

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The NRG S1 Anemometer provides a unique balance of high accuracy and low cost, making it ideal for reducing measurement uncertainty in wind resource assessment campaigns as well as power performance tests. A proven bearing system and a rugged, metal body design ensure the sensor will operate reliably for many years, in a variety of environmental conditions.


The NRG S1 Anemometer is the only wind energy anemometer classified to both editions of the IEC 61400-12-1 standard, enabling straightforward comparisons against both new and legacy anemometers.

IEC 61400-12-1

Edition 1 (2005)

Edition 2 (2017)

Class A



Class B



Class C



Class D



View NRG S1 classification report for IEC 61400-12-1 Edition 1.0 (SOH Wind Engineering LLC)

View NRG S1 classification report for IEC 61400-12-1 Edition 2.0 (SOH Wind Engineering LLC)


More than 60 NRG S1 Anemometers have been field-tested for over a year across a variety of real-world sites. DNV has performed independent verification of the S1 field test. If you are interested in reviewing their technical note or performing your own analysis of the underlying field test data, please click on the following link:

S1 DNV Report

NRG conducted lightning surge testing which showed that the S1 Anemometer’s resistance to damage from surges in electrical current is superior to the other tested class 1 anemometers commonly used in the wind energy industry.

The NRG S1 Anemomer has also been tested extensively to confirm IEC and CE compliance, as well as IP55 ingress protection, the highest IP standard achievable for cup anemometers.

  • IEC-compliant
  • Class 1 wind speed measurements reduce AEP uncertainty
  • Competitive pricing lowers project costs
  • Industry-leading resistance to damage from surges in electrical current
  • Independent field test verification by DNV
  • Proven cup geometry and bearing system
  • Metal body for longer sensor life
  • Individual sensor calibrations available from three MEASNET-certified wind tunnels
  • Optional two-per-box packaging reduces shipping costs


We'll let you know when new features are added and keep you posted on other S1 news.