The lowest amount on a supplier quotation is not necessarily the most economical option for your factory.
Start with comparable units
First confirm whether each supplier is quoting the same fuel specification, delivery basis, moisture content and unit of measurement. Include freight and handling.
Account for operating assumptions
Two quotations with different moisture or calorific value can imply different costs per useful GJ. Where relevant, consider how each fuel performs in your specific boiler.
Use measured data for real decisions
Any reliable industrial assessment must use verified plant conditions, appropriate methods and qualified technical review. Illustrative figures are useful for understanding a concept, not for committing to a purchase or equipment modification.