FACTS Technology Is Reshaping Voltage Control and Power Transmission
Modern transmission networks are being pushed harder than their designers ever planned for. Due to the increased use of renewable energy sources, electric vehicles charging, and international electricity trading, the existing power networks designed long ago now have to transfer electricity at much larger amounts of energy than originally planned. Transmission and distribution losses remain constant at 6-8% of all electricity produced. Flexible AC Transmission Systems (FACTS) allow power grids to maximize their current capacity and operate reliably without the immediate need for costly new construction. Thus, FACTS systems have become an important part of the power networks rather than just an auxiliary means of management.
What FACTS Technology Actually Does
FACTS devices use power-electronic controllers — thyristors and voltage-source converters — to manage voltage, impedance, and phase angle on AC transmission lines in real time. Contrary to mechanical switchgear which acts in seconds, the response time of power electronic FACTS controllers is in milliseconds, which is why these devices are being increasingly used by utilities at weak points in a grid as well as on long feeder lines where there is high risk of voltage collapse. Since the 1970s, shunt FACTS devices have been used for the same purpose (improvement of dynamic performance in power systems), but the technology has developed through several generations from primitive thyristor-controlled reactors to modern technology that is fully converter-based and enables independent control of active and reactive power.
The Core Device Families
Each FACTS controller category targets a specific part of the voltage-stability problem — shunt compensation, series compensation, or combined control. The table below summarizes the four devices engineers reference most often:
| Device | Connection Type | Primary Function | Typical Response Time |
|---|---|---|---|
| SVC (Static VAR Compensator) | Shunt | Reactive power / voltage support | 20–30 ms |
| STATCOM | Shunt | Fast reactive compensation, better fault-ride-through | 5–10 ms |
| TCSC (Thyristor-Controlled Series Compensator) | Series | Impedance control, damping oscillations | 15–20 ms |
| UPFC (Unified Power Flow Controller) | Shunt + Series | Simultaneous voltage, impedance, and phase-angle control | 5–15 ms |
STATCOM units are increasingly favored over SVCs on modern grids because their converter-based design maintains reactive current output even during deep voltage sags, which matters more as inverter-based renewable generation replaces synchronous machines that once provided natural inertia and reactive support.
What the Data Shows
Independent simulation studies across several transmission networks give a consistent picture of measurable gains once FACTS devices are optimally sized and placed:
- Research conducted on a network comprising of 28 buses showed a decrease of the transmission line loss by 19.32% upon implementation of a Static Synchronous Series Compensator (SSSC) in the busy corridor, thus minimizing the total losses of electric power from about 205.18 MW to about 144.57 MW.
- With regard to the 400kV - 230kV electric power transmission network, the innovative placement of capacitor devices and the units of Static Compensating Equipment increased the lines' effectiveness in terms of active power losses by the figure of 35.84% under conditions of the 50% overload and improved voltage levels at weak buses by 31.15% at the same time.
- In a study of 132kV transmission corridor, it was determined that, the optimized usage of the devices of Static Synchronous Compensating Equipment led to the decrease of losses by 14%, the rise of transfer capacity by 32 MW, and decrease of voltage deviations compared to the baseline.
- Broader industry analysis places the transmission-capacity gain from well-placed FACTS controllers at 20–40%, without requiring new conductors or towers.
These figures matter because every megawatt of loss avoided is a megawatt that doesn't need new generation capacity — a direct cost and emissions benefit that utilities can quantify in planning studies.
Market Growth Confirms the Trend
Adoption data backs up what these simulation studies suggest. The global market for Flexible AC Transmission Systems was valued at $2.26 billion in 2025 and is expected to increase up to $4.26 billion by 2034, reflecting a compound annual growth rate of 7.2% as per Dataintelo’s research analysis. This rate is particularly attractive for a mature sector of electricity equipment, being evidence of replacement of outdated mechanical compensation with advanced power electronic controllers by utilities when renewable generation connections are increasing and grid rules are becoming stricter regarding fault riding through requirements. A detailed breakdown of this demand by device type, voltage class, and region is available in this market research report on the Flexible AC Transmission System sector, which segments the forecast across SVC, STATCOM, TCSC, and UPFC deployments through 2034.
Where the Technology Is Heading Next
Voltage control engineering is converging with digital infrastructure faster than most transmission planning cycles anticipated. Traditional Volt/VAR control strategies, built around synchronous generators and predictable load curves, are increasingly inadequate as inverter-based resources, EV chargers, and data-center loads reshape demand patterns on the grid. This is pushing FACTS deployment in three directions simultaneously:
- AI-assisted placement and sizing — optimization algorithms (particle swarm, whale optimization, and similar metaheuristics) are now standard in academic and utility planning studies for locating FACTS devices at the buses where marginal loss reduction per dollar invested is highest.
- Coordination with inverter-based resources — STATCOMs and UPFCs are being tuned to work alongside wind and solar plant reactive-power controllers rather than in isolation, since both compete for the same voltage-support role once synchronous generation retires.
- Real-time digital twins — transmission operators are pairing FACTS controllers with digital models of the network so that a STATCOM or TCSC setpoint can be validated in simulation milliseconds before being pushed to hardware, reducing the risk of destabilizing oscillations.
Government-Backed Modernization Is Accelerating Deployment
Public investment has played a direct role in scaling reactive-power and voltage-control technology in the United States. A U.S. Department of Energy Smart Grid Investment Grant case study on Con Edison's distribution modernization documented a $272.3 million project, of which $136.2 million came from DOE funding under the American Recovery and Reinvestment Act, aimed at deploying pole-mounted capacitors, digital load-tap-changer controllers, and enhanced load-flow modeling to reduce electrical losses and improve voltage management.
That effort has since been followed by a far larger federal push. DOE's Office of Electricity is administering a $10.5 billion Grid Resilience and Innovation Partnerships (GRIP) Program to enhance grid flexibility and improve the resilience of the power system against growing pressures from aging infrastructure, increased load demand, evolving cybersecurity threats, and the rising frequency of disruptive events, and the program is structured to accelerate deployment of transformative projects that ensure reliability of the power sector's infrastructure so all American customers have access to affordable, reliable electricity. Programs of this scale are a large part of why FACTS and related reactive-power hardware markets have sustained double-digit growth in several regions even during periods of otherwise flat capital spending.
Adoption Still Faces Real Constraints
Despite the clear technical and financial case, FACTS deployment isn't frictionless:
- Capital costs — the cost of installing a fully operational UPFC is several times greater than that of an equivalent SVC. Therefore, utility companies need to clarify the reasons for such expense based on losses avoided and delays in transmission upgrades.
- Engineering complexity — sizing and siting studies necessitate a complex combination of power flow and stability modelling techniques. Improper installation of a device may cause its inefficiency or, on rare occasions, lead to emergence of new oscillations.
- Interoperability — connecting power-electronic devices performing functions of FACTS to existing SCADA systems and protection devices in the old transmission corridors might require installation of additional communication and relaying devices.
- Skilled personnel shortage — commissioning and maintenance of FACTS hardware based on converters is a task demanding special knowledge in power electronics which may be still lacking in the engineering teams of many companies.
The Bottom Line
The engineering case for FACTS technology is no longer theoretical — it's backed by loss-reduction figures in the double digits, transfer-capacity gains of up to 40%, and a market moving from $2.26 billion to a projected $4.26 billion within a decade. For transmission planners weighing new conductor installation against power-electronic compensation, the data increasingly favors compensation: faster to deploy, measurably effective, and aligned with a grid that is adding inverter-based generation faster than it is adding new towers. As renewable penetration climbs and grid codes tighten, FACTS controllers are shifting from an optional reliability upgrade to a default component of transmission planning.
Reference: https://dataintelo.com/report/flexible-ac-transmission-system-facts-market
Author: Ashish Kolte is a Marketing Manager at DataIntelo with expertise in marketing, market intelligence, and business strategy. He combines marketing insights with industry research to help organizations understand market dynamics, identify growth opportunities, and make data-driven decisions. His areas of interest include emerging technologies, artificial intelligence, industrial markets, and global business trends. Through his writing, Ashish shares research-backed perspectives on evolving industries and strategic market developments.
Disclaimer: The views and data in this guest post belong solely to the author (DATAINTELO). Please independently verify all statistics before making business decisions.