Mitigating harmonics and lowering noise pollution in a Finnish greenhouse

A lot of energy is needed in year-round greenhouse production because in the winter months, greenhouses are heated and plants are given additional light. Particular challenges in greenhouses are energy-efficient and environmentally sustainable production. In what way could climate emissions from greenhouses be most effectively reduced while increasing production efficiency? Our greenhouse customer was looking for a solution to improve energy efficiency in Närpiö, Finland. Greenhouse lighting appeared as a source of high current harmonics that caused overheating of light bulbs, wires, and other components.

Challenges in the customer’s greenhouse

The greenhouse lights, a total of 22MW, are a source of high harmonic currents. Especially the 3rd harmonic was causing high current in the neutral wire which resulted in overheating of the wires and other power system components, for example, the transformer.

The customer had explored different solutions, in which the noise level and the footprint remained as issues. Furthering the challenge, the solution could not be implemented in the main distribution panel to lower the noise level, as the neutral currents would significantly strain the network, and in the main distribution board power quality solutions would cause resonance with capacitance in the system.

Our Merus® Solution

Due to the customer’s need to solve this issue, they had measurements done by a third party, which led to Merus Power being recommended as the supplier. Merus Power suggested Merus® A2-series Active Harmonic Filters as a solution that was supplied through a third party. Merus® A2-Series filters have a small footprint and low audible noise level, thanks to the modern 3-level topology.

The solution consisted of 24 pieces of Merus® A2-series 100A Active Harmonic Filters, installed in cubicles and parallel to the loads in the distribution boards. The silence solution was needed because the distribution boards are located in the greenhouse space where the cucumbers are grown and the gardeners work.

Segment / Application

Greenhouse with 22MW lighting


Power quality issue

  • High harmonic current distortion

Merus® Solution

Customer Benefits

  • Effective mitigation of harmonics
  • Small footprint
  • Low noise

Results after installation

With the solution, the 3rd, 5th, and 7th harmonics were mitigated with minimal noise pollution. As a result, harmonics were mitigated beyond expectations and the workers of the greenhouse felt their well-being at work had risen significantly due to the noise pollution being lower than before.

Do you have any questions?

Please contact one of our salespeople with questions and inquiries.

Markus Ovaskainen


+358 40 539 2145

Riku Kalliomaa

Head of Sales,
Regions & Channels

+358 50 3323 020

Jaakko Poutamo

Sales Manager,
Energy Storage, Europe

+358 50 918 0012

Mikko Zavertkin

Sales Manager,
Key Accounts & OEMs

+358 40 5908 858

Viktoria Mansikkala

Sales Manager,
Baltics & Eastern and Southern Europe

+358 44 9 735 737

Juhani Jaatinen

Senior Sales Manager,
DACH, Benelux, France,

+49 160 762 4909 (DE)

Venkatesh Ramachandra

Regional Sales Manager,
Middle East

+971 50 55 38 465
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