( 1 ) THE petitioners in this batch of writ petitions have assailed certain provisions of the electricity Tariff issued from time to time by the Municipal Corporation of Delhi as discriminatory and have questioned the computation of the rate of fuel adjustment charges on the basis of actual cost of fuel used.

( 2 ) THE Municipal Corporation of Delhi is a body corporate established under S. 3 of the Delhi Municipal Corporation Act, 1957 (hereinafter called the Act ) and is charged with the Municipal Government of Delhi under its statutory provisions. Under S. 42 of the Act, one of the obligatory functions of the Municipal Corporation of Delhi (for short, called the corporation ) is the construction or purchase, maintenance, extension, management and conduct of any undertaking for the generation or supply and distribution of electricity to the public. For the efficient performance of its functions, a number of municipal authorities under the Corporation are constituted including the Delhi Electric Supply Committee (for short called the D. E. S. C. ). The D. E. S. C. is responsible for the conduct and management of the Delhi Electric Supply Undertaking (for short called