G.R. No. 170934; July 23, 2008
NATIONAL POWER CORPORATION, Petitioner, vs. EAST ASIA UTILITIES CORPORATION AND CEBU PRIVATE POWER CORPORATION, Respondents.

FACTS

Petitioner National Power Corporation (NPC) billed respondents East Asia Utilities Corporation (EAUC) and Cebu Private Power Corporation, both independent power producers (IPPs), for Power Delivery Service (PDS) tariffs. These charges were for ancillary services—specifically Load Following and Frequency Regulation and Spinning Reserve—which NPC claimed were necessary for the delivery of power using its transmission facilities. Respondents paid under protest, contesting substantial portions of the bills, and filed a complaint with the Energy Regulatory Board (ERB, later the Energy Regulatory Commission or ERC) seeking a refund and a cease-and-desist order. They argued that the PDS charges were unauthorized and inapplicable to them as embedded generators selling directly to a distribution utility, not to NPC’s grid.
NPC defended the charges, asserting that the provision of ancillary services inherently required the use of its transmission and sub-transmission facilities, justifying the PDS tariffs under its approved Open Access Transmission Services. It contended that not charging embedded generators like respondents would be discriminatory to other customers and would prevent NPC from recovering its true cost of service.

ISSUE

Whether the Energy Regulatory Commission gravely abused its discretion in ruling that NPC cannot charge respondents PDS tariffs for ancillary services.

RULING

The Supreme Court denied NPC’s petition and affirmed the Court of Appeals’ decision, which upheld the ERC’s ruling. The legal logic rests on the principle of administrative finality and the specialized competence of regulatory agencies. The ERC, as the expert body tasked by law to fix and prescribe rates for the power industry, had approved specific tariffs and guidelines for NPC. In its assailed decision, the ERC found that the approved tariff structure did not provide a basis for NPC to levy PDS charges on respondents for ancillary services. The Court emphasized that rate-fixing is a highly technical function primarily entrusted to the administrative regulator. Absent a showing of grave abuse of discretion—which NPC failed to demonstrate—the factual findings and technical conclusions of the ERC, supported by substantial evidence, are accorded finality and respect. The Court is not equipped to overturn such specialized determinations merely on NPC’s disagreement with the application of its tariffs. Therefore, the ERC did not commit grave abuse of discretion in disallowing the contested charges.