Insight, Grid-Enhancing Technologies market
Grid-Enhancing Technologies Explained: DLR vs Power Flow Control vs Topology Optimization vs Advanced Conductors
By Growth Market Reports Research, published , updated
Grid-enhancing technologies (GETs) are hardware and software that get more power through transmission lines that already exist. There are four main types: dynamic line rating (DLR), advanced power flow control, topology optimization and advanced conductors used for reconductoring. They differ in cost, speed and how long the extra capacity lasts. DLR and topology optimization are the cheapest and fastest; advanced conductors cost the most but give a permanent uprate. This guide compares the four side by side and explains which one fits which grid problem.
The four grid-enhancing technologies at a glance
The US Federal Energy Regulatory Commission names the same four tools in its Order 1920 of May 2024, which requires transmission providers to consider dynamic line ratings, advanced power flow control devices, advanced conductors and transmission switching in long-term regional planning (FERC). The table sets out what each one does, what it costs on public evidence and what it is best for.
| Criteria | Dynamic line rating | Power flow control | Topology optimization | Advanced conductors |
|---|---|---|---|---|
| What it does | Rates a line on real weather and conductor conditions instead of a fixed seasonal limit | Injects voltage in series with a line to push power onto parallel lines with spare room | Finds breaker switching plans that route power around a constraint | Replaces the wire on existing towers with a stronger, hotter-running, low-sag conductor |
| Typical capacity gain | At least 10% for 90% of the time on almost all lines; 30% to 50% on average in favorable climates | 100 MW of firm capacity at PG&E San Jose; more than 300 MW on five 220 kV circuits in Colombia | Depends on the network; uses equipment already in the substation | Roughly double the capacity of a conventional conductor of the same diameter |
| Public cost benchmark | About USD 500,000 for a 22-mile 345 kV line | USD 150 to 300 per kVA for SSSC and UPFC; USD 30 to 50 per kVA for phase-shifting transformers | Software cost; no hardware | Reconductoring USD 1 million to 8 million per mile, by voltage |
| Time to deploy | Weeks | About a year; modular units can be moved | Weeks to months, mainly study and approval | Months; a 137-mile SCE project took 18 months |
| Is the gain permanent? | No, it varies with weather | Yes, while devices are in service | No, used when conditions call for it | Yes |
| Best for | Congested corridors, windy or cold climates, fast relief | Unbalanced flows, where a parallel line has spare capacity | Market congestion and outage planning | Lines that need a lasting uprate without a new corridor |
Sources for each cell are cited in the sections below.
How big is the grid-enhancing technologies market?
The global grid-enhancing technologies market was worth USD 2.05 billion in 2025 and is projected to reach USD 6.67 billion by 2034, a CAGR of 14.0%, according to the Growth Market Reports grid-enhancing technologies market report. Advanced conductors are the largest technology at 51% of 2025 revenue, because reconductoring buys new wire for every phase of a line. Topology optimization is the fastest-growing technology from a small base. North America holds 36.0% of revenue and Latin America grows fastest at a 15.3% CAGR. The top five companies hold about 45% of the market.
Dynamic line rating: the fastest and cheapest capacity
Most lines are still run on static ratings set for hot, still-air conditions that rarely occur. DLR measures or calculates the real limit using sensors on the conductor, weather data or both. The WATT Coalition, which represents advanced transmission technology companies, says almost all lines gain at least 10% of capacity for 90% of the time, and 30% to 50% on average in favorable climates (WATT Coalition). The same page cites a PPL case where DLR cut congestion costs by more than USD 60 million year on year, against a USD 50 million line rebuild.
The cost case is the strongest of the four. In its report to Congress on dynamic line rating, the US Department of Energy cites an AEP example in which DLR on a 22-mile 345 kV line would cost about USD 500,000 and save more than USD 4 million of congestion costs a year, a payback of about two months. Upgrading the same line would cost USD 22 million to 176 million. Heimdall Power reported a 42.8% average capacity gain in its pilot with Great River Energy in Minnesota (Heimdall Power), and National Grid's 2026 framework adds DLR to 39 circuits in Britain (Heimdall Power).
There are two ways to buy DLR. Sensor-based systems (LineVision, Heimdall Power, Ampacimon) measure the conductor or its sag directly. Sensorless software such as GE Vernova's GridOS Digital Dynamic Line Rating computes ratings from weather data without field sensors (GE Vernova). The limitation is that the gain depends on weather, so DLR cannot be counted on for peak planning in the way a new conductor can. Adoption is also uneven: CurrENT Europe found very little evidence of systematic DLR use by European grid operators in December 2025 (CurrENT Europe). A simpler step, ambient-adjusted ratings, is now required in the United States under FERC Order 881, and PJM became the first RTO to run them in March 2026 across 47 weather zones (PJM). For more on this segment, see the dynamic line rating market report.
Power flow control: moving power off overloaded lines
Power often piles onto the line with the lowest impedance while a parallel path sits half empty. Power flow controllers fix this by injecting voltage in series with the line. The main devices are modular static synchronous series compensators (SSSC), unified power flow controllers (UPFC), phase-shifting transformers and series reactors. DOE puts dynamic series devices such as SSSC and UPFC at USD 150 to 300 per kVA and phase-shifting transformers without dynamic control at USD 30 to 50 per kVA (DOE).
Recent projects show the scale. PG&E used Smart Wires SmartValve devices to add 100 MW of firm capacity in San Jose, where CAISO projects up to 500 MW of new load and the new line is not planned until 2032 (PG&E). Transgrid in Australia spent A$45 million on a Victoria to New South Wales interconnector upgrade, including SmartValve units, to release 170 MW (Smart Wires). ISA TRANSELCA installed SmartValves on five 220 kV circuits in Colombia to free more than 300 MW for renewables (Smart Wires). Power flow control only helps where a parallel path has spare capacity, so it suits meshed networks rather than radial lines. Buyers comparing device types can read the static synchronous series compensator market report and the phase-shifting transformer market report.
Topology optimization: capacity from switches you already own
Topology optimization is software that searches for switching configurations, opening or closing breakers, that route power around a constraint using equipment already in the substation. NewGrid, which supplies this software, describes it as a software grid-enhancing technology in a 2025 presentation to ISO New England planners (NewGrid). Because it needs no hardware, it is the cheapest tool to add, and markets are now writing it into their rules. Southwest Power Pool filed tariff changes with FERC in May 2026 to use economic topology reconfigurations, asking for an effective date of 1 October 2026. Its filing notes that MISO implemented 9 of 32 requested reconfigurations in 2024 and 2025 and that ERCOT plans its own mechanism for early 2027 (Southwest Power Pool). The limits are operational: every switching plan must pass reliability checks, and the gain appears only when the network state allows it.
Advanced conductors: the permanent upgrade
Reconductoring replaces the wire on existing towers with composite-core or other high-temperature, low-sag conductors. CTC Global says its ACCC conductor roughly doubles the capacity of a conventional steel-core conductor of the same diameter with about 30% lower line losses, and it reports more than 125,000 miles installed on over 1,450 projects (CTC Global, CTC Global). In a US design study, ACCC for a 230 kV single circuit cost USD 172,973 per line mile. Southern California Edison reconductored 137 miles for USD 48 million in 18 months, against USD 135 million and 48 months for a rebuild (CTC Global).
DOE puts reconductoring at USD 1 million to 8 million per mile depending on voltage (DOE). That is far more than DLR, but the capacity is there on the hottest, stillest day, which planners need for firm connections. The advanced conductor market report covers suppliers and conductor types in detail.
How to choose between them
- You need relief this year on a congested corridor: start with DLR or ambient-adjusted ratings. Weeks to deploy and a payback measured in months in DOE's example.
- A parallel line has spare room: use power flow control. It moves power without touching the conductor and can be relocated later.
- Congestion changes with market conditions and outages: add topology optimization, which needs only software and study time.
- You need firm capacity for a new plant or large load: reconductor with advanced conductors. It costs more, but the gain holds in all weather.
- You are planning ten years out: combine them. Many utilities start with DLR or flow control and reconductor where the gain must be permanent.
Why demand is rising now
Three forces are pushing utilities toward GETs. First, money: on 24 September 2026 DOE selected 31 SPARK projects in 26 states, with USD 1.9 billion of federal funding, to reconductor more than 1,500 miles and deploy GETs on nearly 21,000 miles, adding more than 23 GW (DOE). Second, rules: FERC Orders 881 and 1920 make ratings and GETs part of normal planning. Third, scale: the International Energy Agency says GETs, reconductoring and voltage uprating could unlock 450 GW to 700 GW of capacity worldwide, room for projects now stuck in connection queues (IEA). The main brake is incentives: DOE notes that transmission owners earn a return on capital projects, while GETs are lower-capital alternatives (DOE).
For market size by technology, application, component, end user and 16 countries, plus company profiles and cost benchmarks, see the full Grid-Enhancing Technologies Market report.
Segment, regional and company data for 2023 to 2034, with a free sample.
Frequently asked questions
What are grid-enhancing technologies?
Grid-enhancing technologies are hardware and software that increase the capacity or control of existing power lines. The four main types are dynamic line rating, advanced power flow control, topology optimization and advanced conductors used for reconductoring.
Which grid-enhancing technology is cheapest?
Topology optimization needs only software, and dynamic line rating is the cheapest hardware option: DOE cites about USD 500,000 for DLR on a 22-mile 345 kV line, against USD 22 million to 176 million to upgrade it.
Is dynamic line rating better than reconductoring?
They solve different problems. DLR is fast and cheap but its gain varies with weather. Reconductoring with advanced conductors costs USD 1 million to 8 million per mile but roughly doubles capacity permanently.
How big is the grid-enhancing technologies market?
By Growth Market Reports' analysis the market was worth USD 2.05 billion in 2025 and is projected to reach USD 6.67 billion by 2034, a CAGR of 14.0%. Advanced conductors are the largest technology at 51% of revenue.
Does FERC require grid-enhancing technologies?
FERC Order 881 requires ambient-adjusted ratings, and Order 1920 requires transmission providers to consider DLR, advanced power flow control, advanced conductors and transmission switching in long-term regional planning.
Sources
- U.S. Department of Energy, "Dynamic Line Rating: Report to Congress", 2019-06
- WATT Coalition, "About Dynamic Line Ratings", 2025
- U.S. Department of Energy, "Grid-Enhancing Technologies: A Case Study on Ratepayer Impact", 2022-02
- CTC Global (presentation to the ISO New England PAC), "ACCC Advanced Conductor: Cost-effective Transmission Expansion", 2025-06-18
- NewGrid (presentation to the ISO New England PAC), "Transmission Topology Optimization: A Software Grid-Enhancing Technology", 2025-06-18
- Southwest Power Pool, Inc., "Revisions to Implement Economic Topology Optimization, FERC Docket ER26-2592-000 (filing letter)", 2026-05-21
- PG&E Corporation, "PG&E and Smart Wires Enhance Grid Reliability, Capacity for Data Centers in San Jose", 2025-05-28
- Smart Wires, "Transgrid delivers $45 million Victoria-NSW Interconnector upgrade, releasing flow of renewable energy between states", 2022-11-03
- Smart Wires, "Smart Wires announces delivery of second project with ISA TRANSELCA to accelerate connection of renewable energy", 2024-09-05
- PJM Inside Lines, "PJM Becomes First RTO To Implement Ambient-Air Ratings for Transmission Under FERC Order 881", 2026-03-09
- Federal Energy Regulatory Commission, "FERC Takes on Long-Term Planning with Historic Transmission Rule", 2024-05-13
- U.S. Department of Energy, Office of Electricity, "Energy Department Announces Speed to Power Investments Across 26 States to Lower Electricity Costs and Improve Grid Reliability", 2026-09-24
- International Energy Agency, "Electricity 2026: Grids", 2026-02
- CurrENT Europe, "Dynamic Line Rating still not widely used in Europe, according to a new assessment by CurrENT Europe", 2025-12-16
- GE Vernova, "GridOS Digital Dynamic Line Rating (DDLR)", 2026
- Heimdall Power, "Heimdall Power launches largest dynamic line rating project in the U.S. with Great River Energy", 2024-03-20
- Heimdall Power, "Heimdall Power wins DLR tender with National Grid UK", 2026-04-30
- CTC Global, "The High Cost of Cheap Conductors", 2026-03-10