For two decades the nuclear conversation has revolved around new builds, advanced reactors, and megaproject risk. Meanwhile, forty Westinghouse pressurized water reactors continue operating at roughly the same thermal output they were commissioned at decades ago, leaving six to ten gigawatts of potential capacity sitting inside existing plants. In this episode, I speak with Robb Stewart and James Krellenstein of Alva Energy about why power uprates may be the fastest and most capital efficient way to expand nuclear generation in the United States. Rather than chasing first of a kind reactor designs, they argue that modern steam generator technology, improved thermal hydraulic modeling, and standardized secondary side upgrades can unlock the equivalent of twenty to thirty 300 megawatt small modular reactors within three to five years.
We examine why boiling water reactors captured most historical uprates while pressurized water reactors remained largely untouched, how balance of plant constraints rather than reactor physics often limit output, and why diverting additional steam to a separate turbine island changes both risk and economics. With hyperscalers willing to pay premium prices for reliable, low carbon power, incremental nuclear megawatts now carry real market value. The question is whether the industry can prioritize disciplined industrial execution over novelty and finally harvest the gigawatts hiding in plain sight.
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