The Biden administration's recent tax-credit adjustments for hydrogen production have stimulated growth in nuclear-power-focused companies, with Constellation Energy, Vistra, and NextEra Energy seeing significant stock increases. The final rules released by the Treasury Department and Internal Revenue Service aim to encourage renewable energy by expanding the availability of the tax credit. These rules now include provisions for clean-hydrogen production, allowing struggling nuclear power plants to produce hydrogen for fuel cells. John Podesta, senior climate advisor to President Biden, highlighted the revisions as providing certainty for hydrogen producers, positioning the United States as a frontrunner in green hydrogen production. Constellation Energy's CEO, Joe Dominguez, expressed approval of the new rules, particularly acknowledging that a considerable portion of the existing nuclear fleet can now earn credits for hydrogen production. The revised rules are anticipated to boost investments in clean hydrogen, which had faced a pause due to uncertainty. Evercore ISI analysts anticipate that these changes will benefit companies like Constellation, Public Service Enterprise Group, and Vistra in the long run. The positive market response was evident with Constellation's stock rising 3.8%, Vistra's increasing by 7%, and NextEra Energy and its renewable energy unit also seeing gains. Overall, the revised tax-credit regulations are expected to drive the adoption of clean hydrogen, supporting the renewable energy sector and providing a catalyst for the growth of nuclear power in the context of green energy production.