The Engine Technology Forum, represented by Allen Schaeffer, expresses concerns over the California Energy Commission's proposed revisions to the Renewables Portfolio Standard Guidebook. The Forum asserts that these revisions fail to fully leverage opportunities to decrease energy costs and enhance supply amidst California's ambitious energy and climate goals. Specific points of contention include the lack of explicit recognition for Hydrogenated Vegetable Oils (HVO) or renewable diesel in power generation applications, which are known for their carbon reduction capabilities and cost-effectiveness. The Forum argues that HVO should be included to allow operators of diesel generators to earn renewable energy credits, similar to other bio-based or alternative fuel producers. Moreover, the Forum emphasizes the importance of recognizing all applications for renewable hydrogen use in electricity generation, including internal combustion engines, as a crucial step towards meeting California's greenhouse gas reduction targets. The comments filed with the California Energy Commission aim to highlight the significance of HVO and renewable hydrogen in advancing sustainable energy solutions and advocating for their explicit inclusion in the Guidebook revision.