Distribution Grids Turn Reactive Power into a Local Flexibility Resource

Energy Business Review | Monday, October 12, 2026

Reactive power utilisation solutions in Europe are moving from transmission-focused voltage support into distribution-level flexibility as rooftop solar, electric vehicle charging and heat pumps place new stress on local networks. The distribution grid is no longer a passive delivery layer. It is becoming an active system where voltage and power flows must be managed closer to customers.

A 2026 German research paper on coordinated voltage and reactive power control says modern low-voltage grids face rising shares of photovoltaic generation and high-power loads such as heat pumps and EV charging stations. It notes that voltage constraints can become binding before thermal limits, causing costly conventional reinforcement.

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This is important for utilities because distribution upgrades are expensive and slow. If reactive power flexibility from distributed generators, substations and controllable equipment can reduce voltage violations, operators may defer some reinforcement while still connecting more low-carbon technologies.

The same research describes OptiQU, a coordinated control concept for medium- and low-voltage grids. It combines centralized optimization with local control and fallback strategies, aiming to coordinate distributed energy resource reactive power and substation equipment to reduce voltage violations and curtailment.

Reactive power control is becoming more coordinated than it was in the past. Instead of relying on individual devices to respond independently, utilities can now manage solar inverters, transformer tap changers and other grid assets through a common platform. That broader view allows voltage to be managed more consistently across the feeder.

Regulatory and market design are also changing. RTE in France announced that new voltage control ancillary service rules will take effect on January 1, 2027. The rules change payment toward measured reactive energy supplied to the grid and actual availability, while allowing renewable producers to provide static reactive power compensation with non-synchronous units when they are not injecting active power.

This is a significant business signal. If reactive power availability is measured and compensated more explicitly, distributed and renewable assets may become more valuable as grid-service providers. Solution vendors can help asset owners configure, certify and monitor this capability.

Industrial and commercial customers also have a role. Poor power factor can increase losses, reduce usable capacity and trigger utility charges. Dynamic power factor correction and local compensation can help facilities reduce electrical stress while supporting grid quality.

The challenge is data and control access. Distribution operators need visibility into local voltage, DER behaviour and feeder conditions. Asset owners need clear rules on when reactive support is required, how it is measured and how it affects equipment life.

The next phase of distribution-grid flexibility will likely favour platforms that coordinate many small resources rather than relying only on large grid assets. Reactive power will become more valuable when it can be located precisely and controlled reliably.

Across Europe, distribution operators are looking for ways to make better use of the capacity already available on their networks. Reactive power management is becoming one of those options, helping utilities connect additional electrified demand and distributed energy resources without immediately turning to expensive grid reinforcement.

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