Witnesses said that upsides include that it delivers more emissions reductions than alternatives and that feedstock supplies are theoretically almost limitless. It is also a new way to store surplus electrical energy that might otherwise be curtailed.iiNZET Committee, Official Report, 30 September 2025, cols. 3-5 and 16-17; 28 October 2025, cols. 7-8, 11-12, 16-18
By contrast, biofuel feedstock is likely to quickly run out if deployed at scale, and in any case might more usefully be deployed in other areas, at smaller scale.iiiNZET Committee, Official Report, 30 Sept 2025, cols. 10, 23; 28 October 2025, cols. 16-18 The alternative would be to repurpose land currently used for other reasons, such as food production, to grow and harvest HEFA feedstock.