Driving Energy Efficiency in RNG Plants with ABB Technologies

By ABB Group

The Renewable Natural Gas (RNG) market is rapidly expanding as industries seek sustainable solutions to reduce carbon emissions and optimize energy use.

RNG facilities, often operating in power ranges from 1 MVA to 15 MVA, face unique challenges: fluctuating loads, grid stability issues, and stringent efficiency targets. These facilities rely on compressors, blowers, and pumps that consume significant electrical energy. Power quality issues, including harmonics and voltage fluctuations, can lead to inefficiencies and downtime.

Additionally, regulatory frameworks and ESG commitments demand lower emissions and optimized energy consumption. Choosing the right equipment is essential to meeting the RNG market needs.

ABB’s advanced technologies—Active Front End (AFE) drives, Battery Energy Storage Systems (BESS), Synchronous Condensers, STATCOM, and Flywheel Energy Storage Systems (ESS)—offer integrated solutions to address these challenges.

Active Front End Drives (AFE)

Significant energy savings can be achieved by adding a variable frequency drive (VFD) to the powertrain. A VFD (Variable Frequency Drive) matches motor speed with the actual demand of the process and reduces the energy consumed by the motor.

Adding a VFD to the motor system results in substantial energy savings. In the example of a fan, reducing rotating equipment speed by 20% can reduce input power requirements by approximately 50%.

Selecting a VFD with active front-end technology mitigates harmonics, improves power factor to ensure efficient energy utilization, and enables regenerative braking to feed energy back to the grid,reducing waste.

This is important on compressors and blowers in plants, where variable speed control and clean power are critical.

Battery Energy Storage Systems (BESS)

Battery Energy Storage Systems help stabilize voltage and frequency in weak grids, enable load shifting and demand response to reduce energy usage, and support microgrid operations, particularly for remote RNG sites. Its integration with plants ensures reliable management of intermittent renewable energy inputs.

Synchronous Condensers

Synchronous Condensers improve fault tolerance and provide dynamic reactive power support, which is especially critical for RNG facilities connected to weak grids or areas with high renewable energy penetration. Synchronous condensers are a good solution for large RNG hubs that require robust voltage control and inertia support.

STATCOM (Static Synchronous Compensator)

STATCOM systems provide fast reactive power compensation to respond to voltage dips and surges. When paired with BESS,, the STACOM enhances grid stability, making this solution best suited for plants with fluctuating loads and sensitive equipment.

Flywheel Energy Storage Systems (ESS)

Flywheel Energy Storage Systems provide short bursts of high-power support for frequency regulation and inertia to maintain transient stability. ESS works best for sites that need rapid response to load changes without the wear and degradation associated with chemical batteries.

As RNG facilities scale to meet global decarbonization goals, energy efficiency becomes a strategic imperative.

ABB’s advanced solutions—AFE drives, BESS, STATCOM, synchronous condensers, and flywheel ESS—empower operators to achieve maximum efficiency, reliability, and sustainability across the 1–15 MVA power range.

Your vision, our innovation– ABB delivers solutions built around you. ABB, Engineered to Outrun.

For more information, read our Efficiency Magazine.