Wind Pitch Control

A wind turbine’s emergency pitch control system rotates the blades out of the wind for safe shutdown during a grid power loss or excessive wind speeds to protect the turbine from catastrophic damage. Electric pitch systems require energy storage to ensure the system pitches the blades successfully during those critical moments when the turbine must be brought to a standstill.

For several years, lead-acid batteries were relied on for this critical application. Today, a growing number of wind farm operators choose to install turbines with Maxwell Technologies-engineered ultracapacitor energy storage solutions due to our technology’s significantly longer life, minimal maintenance requirements, and ability to significantly reduce O&M costs and boost turbine availability.

Maxwell Technologies’ Retrofit Solutions

Maxwell’s ultracapacitor retrofit modules replace existing batteries for reliable and fail-safe pitch system performance.

See more

Case Study

Wind Farm Reduces Pitch Faults and Battery Replacements Using Maxwell Technologies’ Retrofit Solution for Emergency Pitch Backup Systems

Get case study

White Paper

Boost Wind Turbine Availability and Reduce O&M Costs with Ultracapacitors for Emergency Pitch Control Backup Systems

Get white paper

We provide reliable energy storage solutions for more than 76,000 wind turbines worldwide.

Leading wind turbine OEMs, pitch control system manufacturers and wind farm operators turn to Maxwell for quality and reliability. Our ultracapacitor-based energy storage solutions save wind farm operators the high costs of battery system replacement for electric pitch systems. Whether the turbines are installed onshore or offshore, our technology’s proven performance and resiliency in the demanding and remote turbine environment is what has earned us the trust of our customers.

See available products for new turbines and aftermarket retrofits.

Improve your levelized cost of energy with one smart move.

Levelized cost of energy (LCOE) is a primary utility industry metric for the cost of electricity produced by a generator. Several factors determine LCOE, including capital costs, fuel costs, and fixed and variable operations and maintenance costs.

Wind farm operators who choose to install Maxwell’s ultracapacitor-based energy storage solutions for emergency pitch systems fair better in the long-run: Wind farms using Maxwell’s solutions report fewer turbine climbs, reduced costs associated with maintenance and component replacements, and increased turbine availability. We designed our solutions to help you achieve a top priority: to reduce O&M costs and improve LCOE so that you can focus on providing the best service to your end customers.

Sharpen your competitive advantage.

In a market where every cent counts and every choice affects costs and overall output, you need the technology that will help you attain your predicted production levels. Maxwell’s wind product line helps our customers stay competitive by providing the following advantages:

  • Long lifetime
  • Unmatched power delivery and fast charge/discharge capability
  • Optimal performance over wide ambient temperature conditions
  • Minimal degradation over time
  • Abuse tolerant in the demanding turbine environment
  • No corrosive acids and low risk for leakage
  • Excellent economics: better, long-lasting value compared to lead-acid battery-based systems; no active management required; no regular maintenance means reduced O&M costs
  • Reliable performance results in safer operations and fewer turbine climbs

See available products.

Contact Us

Contact us using the form below to request more information or to find out how ultracapacitors can work for your application.





In the Media

Emergency Pitch Control: How Ultracapacitors Improve Efficiency and Reduce O&M Costs
North American Clean Energy
Reducing O&M Costs with Ultracapacitors in Emergency Pitch-Control Systems
Windpower Engineering & Development
Enercon Selects Maxwell Technologies’ Ultracapacitors
Power Electronics
Improving Emergency Wind Pitch Safety and Reliability
PES Wind
The Key to Reliable Emergency Backup Power for Wind Pitch Control
PES Wind


Related Articles

Ultracapacitors for Wind: Maxwell and Freqcon at HUSUM Wind
The city of Husum in Northern Germany became a vivid center where major wind players and energy providers convened to exhibit their solutions and debate existing wind issues at the HUSUM Wind conference.

Read More >


Maxwell Technologies Selected for China Guodian Corporation’s First Ultracapacitor-Based Wind Energy Storage System
Beijing Huadian Tianren Electric Power Control Technology Co., Ltd., a subsidiary of China Guodian Corporation, selected Maxwell’s ultracapacitor technology as the core component of a wind farm energy storage demonstration project.

Read More >


The Advantages of Ultracapacitors in Wind Turbine Electric Pitch Control Systems
There are two types of energy storage systems used for electric wind turbine pitch control: ultracapacitor-based and battery-based. While batteries are efficient devices for many applications, ultracapacitors have the advantage when it comes to supporting a wind turbine’s electric pitch control system.

Read More >


Bringing the Power and Longevity of Ultracapacitors to the World’s Wind Turbines
Onshore or offshore serviceability is a big challenge, especially when looking at offshore applications where costly turbine maintenance is done by boat or even by helicopter.

Read More >


Practical Business Reasons for Retrofitting Wind Turbines with Ultracapacitors
Size and power aren’t the only features that have evolved in turbine technology. Ultracapacitor-based pitch control systems are becoming a standard solution offered by turbine manufacturers.

Read More >


How Ultracapacitors Can Support the Growing Wind Industry
Implementing ultracapacitors for energy storage in wind pitch control systems improves safety for technicians, increases overall performance reliability and reduces system costs.

Read More >


Related Products

  • 16 Volt Small Module

    16 Volt Small Module

    Maxwell Technologies’ 16V small cell ultracapacitor module provides energy storage and power delivery in a compact, cost-effective module. The modules are specifically engineered to provide cost-effective solutions for wind turbine pitch control of 1.5MW and smaller, small UPS systems, telecommunications and other lighter-duty industrial electronics applications.

    View Product
  • 16 Volt Large Module

    16 Volt Large Module

    Maxwell Technologies’ 16V ultracapacitor module product line provides customers with a broad range of choices to meet their energy storage and power delivery requirements – in a rugged package that can be configured for higher voltages and energy if needed.

    View Product
  • 75 Volt Power Module - Not Recommended For New Design

    75 Volt Power Module - Not Recommended For New Design

    Maxwell Technologies’ 75V module is designed for low duty cycle energy storage applications such as wind turbine pitch control and backup power generation systems. The module includes passive balancing circuitry and thermal monitoring, and its enclosure meets the IP54 standard.

    View Product
  • 90 Volt Module - Not Recommended For New Design

    90 Volt Module - Not Recommended For New Design

    Maxwell’s 90-volt module has a 10 farad capacitance and low equivalent series resistance (ESR) for high power delivery. Typical applications for the 90-volt module include wind turbine pitch control, industrial uninterruptable power supply (UPS) and dynamic voltage restorer (DVR). Maxwell offers 75-volt and 240-volt modules in addition to the 90-volt version for these applications.

    View Product
  • 160 Volt Module

    160 Volt Module

    Maxwell Technologies’ 160V module is designed to provide energy storage and power delivery for wind turbine pitch control, short-term uninterrupted power supply (UPS) and renewable energy systems. Primarily designed for pitch control systems for 1.5 to 3MW wind turbines, the 160V module provides a turnkey solution to simplify the installation process and reduce costs for all integration partners.

    View Product
  • 240 Volt Module - Not Recommended For New Design

    240 Volt Module - Not Recommended For New Design

    The 240-volt ultracapacitor module offers fast-responding, high power energy storage with the advantages of low internal resistance, passive cell balancing, a wide operating temperature range of –40°C to 65°C and up to 500,000 duty cycles or 10-year life,* ensuring long-lasting, reliable performance in your system.

    View Product
  • Maxwell’s Retrofit Solutions for Emergency Pitch Backup Systems

    Maxwell’s Retrofit Solutions for Emergency Pitch Backup Systems

    Designed for use in GE 1.5 MW turbines and in Clipper 2.5 MW turbines, Maxwell’s ultracapacitor-based retrofit solutions for emergency wind pitch control systems replace the turbine’s original battery systems for increased performance, reliability and lifetime, giving wind farm operators the benefits of fewer turbines climbs, reduced component replacements, and increased turbine availability.

    View Product