By Probe Media
Scotland’s electricity system is becoming increasingly fragile as the National Energy System Operator (NESO) prepares to conduct a world-first experiment on its power grid.
The operator plans to test “synthetic” or alternative stability services—such as grid-forming batteries, synchronous condensers, and other inverter-based technologies—at a scale never before attempted across an entire regional grid the size of Scotland.
Energy consultant Kathryn Porter of Watt-Logic has described the gamble as “scary stuff” with only minimal oversight, warning that it could trigger the total collapse of the Scottish grid and force reliance on controlled, rolling outages. As policymakers continue to hail Scotland as an “energy superpower” built on vast wind resources, Porter destroys that narrative by focusing on three simple, undeniable realities: physics, real-world engineering, and basic economics. [See: Kathryn Porter’s keynote presentation to the Aberdeen and Grampian Chamber of Commerce on May 26].
Explaining why the current path is making the lights unreliable and expensive, Porter cites clear examples:
Electricity isn’t just “making power” — it’s a giant, complex machine that must stay stable every second of the day:
- Normal power from gas, coal, and nuclear comes from turbines that turn at exactly the right speed to create a perfect 50 Hz wave, akin to a heartbeat.
- The heavy spinning parts have natural inertia—they resist sudden speed changes. They also automatically help to control voltage.
- The global electricity system is fundamentally built around alternating current (AC) transmission. While wind turbines and solar panels generate power that is converted into direct current (DC) within their electronic systems, electricity cannot be transmitted efficiently or integrated into the existing grid in that form. Before it can be fed into the AC network, it must be converted through inverters—electronic devices that synchronize renewable generation with the grid.
- Most of these inverters operate as “grid followers” rather than “grid formers.” Instead of establishing the grid’s frequency and voltage, they merely respond to conditions that already exist. A useful analogy is a child jumping rope: the child can keep pace only if someone else is already swinging the rope steadily. If the rope begins to wobble, the child struggles to stay synchronized. In the same way, grid-following inverters depend on a stable AC system; when the grid becomes unstable, they can disconnect or cease providing support precisely when it is needed most.
The result, argues Porter, is that as spinning power stations close and more wind and solar is added, the whole system loses its natural shock absorbers. Small problems—including faults, clouds, or demand spikes—turn into big swings in frequency or voltage. Equipment trips off to protect itself leading to bigger problems, and potentially blackouts. Scotland’s remote northern wind farms exacerbate the problem by sending power long distances to demand centres, further straining voltage control and system strength without local stabilizing generation.
Porter cites the April 2025 Iberian blackout as a real-world example. She describes the trigger as a minor fault in a weak grid with low synchronous generation, leading to oscillations, and then mass disconnections of renewables, frequency collapse, and total blackout. Renewables advocates downplayed the failure, but Porter argues at issue was inverter-based generation’s inability to support the grid during disturbance.
Porter frames Scotland as a cautionary tale for markets racing toward net zero: a resource-rich nation covered in wind turbines yet left vulnerable to blackouts, import dependence, and exploding system costs for backups, balancing, and synthetic inertia that conventional plants once provided for free.
She points to the dismantling of the North Sea’s skilled industrial base through punitive taxes and licensing uncertainty while demand for oil and gas persists, hollowing out supply chains and engineering capacity needed for any future infrastructure.
Other countries, says Porter, should heed the warning: electricity systems are governed by physics and economics, not slogans. Rapid renewables integration without adequate synchronous support risks precisely the instability, unreliability, and hidden consumer costs now materializing in Scotland. Policymakers elsewhere, urges Porter, must prioritize resilience and proven engineering over ideological targets if they wish to keep the lights on.