Final answer:
True, changing any grade of fuel-oil generally requires approval from the EPA to ensure compliance with environmental regulations.
Step-by-step explanation:
The statement that approval from the NYC Environmental Protection Agency is required before changing any grade of fuel-oil is True. Regulatory agencies like the Environmental Protection Agency (EPA) implement and enforce policies to ensure environmental safety and compliance with federal and state laws. In contexts like New York City or Illinois, any significant alterations in fuel type or energy generation, particularly ones that could impact air quality, typically necessitate a review and approval by the respective EPA to guarantee that the changes adhere to the environmental standards and regulations in place.