A recent renewable diesel demonstration in Alberta shows that biodiesel blends can function quite well in cold weather climates. The form of biodiesel that performs the closest to petro-diesel is HDRD -- hydrogenated derived renewable diesel.
Finland's Neste Oil has pioneered the HDRD process (NExBTL) and refined it to the point that in the Helsinki area, 100% Neste biodiesel is used widely in city buses. Neste utilises both vegetable oils and animal fats in the production of its NExBTL hydrogenated biodiesel product, which provides for mor flexible feedstock supply.
More links on the Neste NExBTL process here.
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