Interchange Recharged

The grid's immune system is retiring: Synchronous condensers, AI data centers and the physics gap that software alone can't close

As coal and gas plants retire, the energy transition conversation focuses on replacing their generation capacity. What gets far less attention is the loss of the physical properties those machines provided for free: inertia that stabilises frequency, fault current that supports voltage during disturbances, and reactive power that regulates voltage across the network. These services come from the physics of enormous spinning rotors synchronised to the grid, responding instantaneously, without sensors, software or control loops. As inverter-based resources replace them, that mechanical immune system disappears, and a new, extreme stress test is arriving at the same time in the form of AI data centres whose loads can swing by hundreds of megawatts in a fraction of a second. Host Bridget van Dorsten is joined by Kristina Carlquist, General Manager of Synchronous Condensers at ABB, and Christian Payerl, Sales Manager of Synchronous Condensers at ABB, to unpack why a technology that has existed for as long as the grid itself is now experiencing a revival. Christian explains the three ancillary services the grid is losing, inertia, short-circuit current and reactive power, and why inverter-based generation does not replace them. Grid-forming batteries can be programmed to simulate inertia, but each charge-discharge cycle degrades lifetime, overload capacity is limited to microseconds, and the models needed for accurate grid simulation are often tied up in manufacturer IP. Synchronous condensers respond on physics alone, in both directions, with no degradation and no modelling uncertainty. The recent blackout in Spain illustrates what happens when that gap is left unfilled. Kristina walks through the commercial traction. ABB's partnership with VoltaGrid on isolated data center microgrids has grown from an unexpected inbound enquiry in late 2024 to dozens of synchronous condensers delivered. On the grid-connected side, the Faroe Islands have deployed four units with a fifth on the way as part of their push toward 100% renewables, already achieving multi-day periods of fully renewable operation. ABB is also working with Korea's Jeju Island on its first flywheel-equipped deployment. The demand pattern is widening: islands integrating renewables, TSOs managing weak grid regions, mines electrifying operations, and now data centre developers who had never considered grid stability equipment before. The episode closes on regulation and standards. Christian, who participates in international standards work through CIGRE, notes that there is still no international standard for flywheel safety and that the treatment of inertia as a paid service varies dramatically by country. While inertia is compensated as a paid service in the UK, in Sweden it is treated as free – rotating machines providing it receive no income stream for doing so. As data center load grows faster than regulation can respond, both guests argue that the answer is not one technology but a combination, provided the industry, utilities and policymakers can align on what the grid actually needs to remain stable. See Privacy Policy at https://art19.com/privacy [https://art19.com/privacy] and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info [https://art19.com/privacy#do-not-sell-my-info].

Beyond combustion: Long Island's first hydrogen-powered linear generator and the fuel-flexible answer to the dispatchable emissions-free resource problem

Utilities are under pressure to deliver generation that is dispatchable, affordable, and clean enough to satisfy increasingly stringent environmental rules, notoriously hard to do in one asset. As renewables grow, the gas turbines and engines that have historically filled the gap come with a NOx problem, a CO2 problem, or both. Hydrogen offers a path through, but the supply isn't there yet. So what do you build today? Host Bridget van Dorsten is joined by Shannon Miller, CEO of Mainspring Energy, and Will Hazelip of National Grid Ventures, to dig into a technology most listeners haven't heard of and the first commercial hydrogen-powered deployment of it. Mainspring's 250-kilowatt linear generator is being installed at National Grid's 1,500 MW North Port facility on Long Island, in partnership with NYSERDA, the Long Island Power Authority, and Stony Brook University. Shannon explains how Mainspring redesigned the generator using the power electronics that drive solar inverters, batteries and EVs, replacing mechanical systems with software, eliminating the flame, and operating at temperatures low enough to take NOx out of the equation. An adaptive pressure cycle, software-controlled in real time, runs the same hardware on hydrogen, compressed natural gas, biogas, propane or blends, with no hardware change. The 250 kW form factor matters too: efficiency holds across the full load range, fleet redundancy replaces single-asset reliability risk, and deployment is a concrete pad plus electrical and fuel hookups rather than a multi-year build. Will frames the project against the regulatory backdrop. Long Island sits in a non-attainment zone for NOx, and New York's path to a carbon-free grid requires what the state calls a dispatchable emissions-free resource. The unit will run for 12 months on green hydrogen and on compressed natural gas, with Stony Brook measuring emissions and efficiency, NYSERDA watching for regulatory design, and National Grid building operational experience for the rest of its ageing fleet. The economic case rests on the alternative. New-build hydrogen-capable gas turbines run $3,500–$4,000/kW on capex (per Wood Mackenzie), with delivered power costs reaching $300–$900/MWh once hydrogen is layered in. Shannon's point is that committing to a single-fuel turbine only pays off if the fuel actually arrives at the scale and price you assumed. With hydrogen supply uncertain, that's a stranded-asset risk linear generators avoid by running on whatever fuel is available today. Will adds the carbon-market angle saying that as carbon pricing develops, real-time fuel switching becomes an optimisation lever, not just a hedge. Then there’s the supply reality. Total US hydrogen production today isn't enough to fuel a single 500 MW power plant, and with 45V tax credit requirements tightening and federal climate policy in flux, the gap between hydrogen ambition and supply isn't closing fast. Will's suggests starting with the fuels that exist today and scale into hydrogen as supply grows. The episode closes on demand. Mainspring's factory produces 325 MW a year today and can roughly double in 12–15 months, with pull from industrial customers, data centres and AI infrastructure, and utilities at once, driven by the same problem: nobody can get power fast enough. This episode is sponsored by GridBeyond. Energy asset owners face a critical challenge: how to optimize performance and drive new revenue in competitive, fast-moving markets. GridBeyond solves this through AI-powered forecasting, energy trading and optimization.  GridBeyond's platform delivers:  * Precision forecasting to anticipate market opportunities  * Intelligent market access across multiple revenue streams  * Real-time control that responds instantly to market conditions  * Optimization that combines AI insights with expert oversight  Whether you're managing batteries, gas peakers, hybrid sites, or complex multi-asset portfolios, GridBeyond helps you turn assets into high-performance revenue machines. The proven platform has helped businesses across the energy sector maximize returns and accelerate their energy transition.  Want to learn more? Visit go.gridbeyond.com/recharged  https://go.gridbeyond.com/recharged [https://urldefense.com/v3/__https:/go.gridbeyond.com/recharged__;!!K61u_eNLIYw!UGpFayka05jqzoyapVJ54vNOJkgbeVdnUGf5nvdfEDBLTTWqLhOhruu_oitf6cWhkFsU3ajFrXcBcgXfKgMvkzfNWduAsuo$]   See Privacy Policy at https://art19.com/privacy [https://art19.com/privacy] and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info [https://art19.com/privacy#do-not-sell-my-info].

The electrolyzer reckoning: Can disciplined product development deliver on green hydrogen's promise before the survivors run out of runway?

Empty gigawatt factories, product recalls, participation rates that never materialised, and a policy environment that has now stripped the green premium entirely. The electrolyzer industry has had a brutal few years and most of the companies that raised hundreds of millions on the back of the hydrogen hype cycle are now sitting with fixed costs they cannot sustain and field deployments they are not proud of.  Host Bridget van Dorsten speaks with Raveel Afzaal, CEO of Next Hydrogen, one of the few electrolyzer manufacturers that chose to watch from the sidelines while competitors scaled into the storm. Raveel describes the decision in blunt terms: in 2021, when cost of capital went to near zero and capital discipline evaporated, Next Hydrogen looked at the macro signals; rising inflation, rising interest rates, a market telling them their Hyundai partnership was worth a 5% share price drop, and chose to extend their runway from 18 months to five years. That meant hard capital allocation decisions, and the answer was to invest in the product, not the factory.   The conversation goes deep into a problem that rarely gets discussed publicly: the commercialisation valley of death. Getting to a working prototype is celebrated, but the productisation phase, technology readiness levels five through seven, is where the funding gap is most severe and the cost shock is greatest. Costs typically rise three to five times from prototype stage, revenues do not yet exist, and neither government programmes nor conventional investors are structured to bridge it. Raveel explains why so many companies that made it to prototype stage never made it to commercial deployment and what surviving that valley actually required.   Raveel also pushes back on a common framing around Chinese versus Western electrolyzers. His argument is that the quality question is not a national origin question , it is a materials question. What membranes, what bipolar plates, what catalyst, what functional safety architecture? Next Hydrogen's own answer to those questions is unusual: replacing nickel bipolar plates with large injection-moulded specialty engineered plastics, eliminating corrosion risk entirely and reducing cost through higher material utilisation rather than lower-grade materials. The company holds 40 patents on a cell architecture designed from the outset for direct connection to variable renewables, a design decision made in 2008, when the rest of the industry was still building for baseload.   The episode closes on what the next two to three years look like for electrolyzer manufacturers. Raveel's view is that consolidation is coming, but many companies won't survive long enough to be part of it, their fixed costs are too high and their runway too short. The companies that survive will be those with variable cost models, disciplined project selection, and a genuine answer to three questions: Can you access excess electrons? Can you deliver containerised, plug-and-play solutions that control total installed cost? Can you reliably handle the intermittent operations that direct renewable connection demands? Next Hydrogen is betting the answer starts with getting the cell design right first.  Today's episode is sponsored by GridBeyond. Energy asset owners face a critical challenge: how to optimize performance and drive new revenue in competitive, fast-moving markets. GridBeyond solves this through AI-powered forecasting, energy trading and optimization.  GridBeyond's platform delivers:  * Precision forecasting to anticipate market opportunities  * Intelligent market access across multiple revenue streams  * Real-time control that responds instantly to market conditions  * Optimization that combines AI insights with expert oversight  Whether you're managing batteries, gas peakers, hybrid sites, or complex multi-asset portfolios, GridBeyond helps you turn assets into high-performance revenue machines. The proven platform has helped businesses across the energy sector maximize returns and accelerate their energy transition.  Want to learn more? Visit go.gridbeyond.com/recharged  https://go.gridbeyond.com/recharged [https://go.gridbeyond.com/recharged]   See Privacy Policy at https://art19.com/privacy [https://art19.com/privacy] and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info [https://art19.com/privacy#do-not-sell-my-info].

Flexibility as a service: Can Octopus's acquisition of Uplight finally make US residential VPPs work?

Millions of enrolled devices, 60 utilities, and the participation rate gap that's been embarrassing the US market for a decade.  US residential virtual power plants have been a promising idea that's consistently underdelivered — participation rates below 5%, fragmented apps, siloed programmes, and utilities that have simply never had to compete for a customer's attention. Meanwhile, Octopus Energy has built the world's largest residential VPP in the UK, with EV driver participation rates of 50 to 70%. The question has always been whether that model can travel to a market where most customers have no supplier choice at all.  Bridget van Dorsten speaks with Nick Chaset, CEO of Octopus Energy US, about the acquisition that represents Octopus's biggest bet on answering that question: a majority stake in Uplight alongside Schneider Electric, giving Octopus access to established relationships with more than 60 US utilities — including eight of the ten largest.  Nick argues the participation gap isn't really a cultural problem or a technology problem. It's a regulatory design problem. US flexibility programmes have been built device by device, forcing consumers to juggle multiple apps and enrolments — and in some cases prohibiting them from combining assets across programmes. Octopus's answer is one app, a 30-second sign-up, and a value proposition framed entirely around what consumers actually care about: lower bills. Can that translate through a utility partnership channel rather than a direct retail relationship? The conversation also tackles the data centre dimension. Nick makes the case that residential flexibility isn't a separate story from the large load interconnection challenge — it's part of the solution. If utilities can statistically guarantee load reductions from tens of thousands of enrolled homes during peak hours, they may be able to connect larger data centre loads at smaller interconnection points. And in many hours when a data centre might otherwise ramp down, it could simply be cheaper to pay consumers to flex instead.  Octopus's model is built on trust earned through direct consumer relationships. Can that translate through a utility intermediary at scale, across 60 different utility cultures without losing what makes it work? See Privacy Policy at https://art19.com/privacy [https://art19.com/privacy] and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info [https://art19.com/privacy#do-not-sell-my-info].

The muscle we forgot: SMRs, hyperscalers, and why this nuclear renaissance might actually be different

Why nuclear has never been project financed and how that might finally be about to change. Every nuclear plant ever built has ultimately been backstopped by taxpayers or ratepayers. Not because the technology doesn't work, but because nobody has ever cracked the construction cost and schedule problem well enough to convince a bank to finance it without government support. Bridget van Dorsten is joined by Jake Jurewicz, Co-founder and CEO of Blue Energy, to explore why that has been so hard and what a credible path to fixing it might actually look like. Jake walks through the root cause of nuclear's cost overrun problem and it is not the reactor. The reactor equipment itself represents around 7% of total project costs. The real problem is what Jake calls nuclear construction overhead: the cost of mobilizing, training, and retaining the 10,000 or so skilled workers needed to build these plants in the field, the way we have been building them for 70 years, essentially the same way you would build a castle. The episode then turns to what Blue Energy is doing differently. By intentionally selecting sites accessible by barge and contracting existing oil and gas fabrication yards and shipyards to build large pre-assembled modules offsite, Blue Energy aims to bring fixed-price contracts into nuclear for the first time, the same contracting structure that made offshore wind and LNG bankable. Jake explains why that single shift changes everything for project financing. Bridget and Jake also work through the demand side of the equation: why hyperscalers are becoming the crucial beachhead market for new nuclear, what binding PPAs from investment-grade counterparties actually signal versus announcements, and why the restarts and uprates, while valuable, only go so far. The conversation also covers Blue Energy's first announced project at the Port of Victoria in Texas, a 1.5 gigawatt nuclear-powered AI data centre co-located with a gas-to-nuclear conversion, designed to accelerate commercial operation and reduce cost of capital even without government loan support. Jake explains the mechanics of why firing the balance of plant with gas first before switching to nuclear steam is not a compromise but a genuine financing innovation. Finally, Jake offers a view of what signals actually matter when separating the nuclear renaissance from the noise: binding PPAs, large balance sheets standing behind fixed-price contracts, and projects moving through the Nuclear Regulatory Commission rather than staying at the prototype stage. See Privacy Policy at https://art19.com/privacy [https://art19.com/privacy] and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info [https://art19.com/privacy#do-not-sell-my-info].