Along with seven partners, we submitted a letter to the Department of the Treasury about the best methodology for determining lifecycle greenhouse gas emissions of hydrogen production when calculating the applicable amount of the 45V production tax credit (PTC). The letter had two primary purposes: (1) if local hourly energy matching is adopted as part of 45VPTC implementation, to highlight the critical importance of defining “local” in such a way that avoids increasing carbon emissions, and (2) to advocate for carbon matching as a more cost-effective and scalable alternative compliance pathway that also solves the problem that local hourly energy matching addresses.