Hindustan Zinc Limited challenged the validity of Regulations 32 and 92 of the Rajasthan Electricity Regulatory Commission's Tariff Regulations, 2025, which impose Late Payment Surcharge and Parallel Operation Charges on Captive Power Plants. The petitioner argued that these regulations are ultra vires the Electricity Act, 2003, and violate Articles 14 and 19(1)(g) of the Constitution of India. The court considered the petitioner's objections and the respondent's justifications for the regulations.