This is typically set for a multi-year period – currently, a period (the “fourth regulatory period”) from July 1, 2015 to June 30, 2019 – and reviewed periodically. The MAR in turn determines the Maximum Average Price (MAP), which is the rate per kWh that Meralco can charge its customers. For the latest regulatory year (2015), the MAP for Meralco was P1.6878/kWh. The rate is not the same for all customers, provided the average rate across all customer classes matches the MAP rate. According to various filings with the ERC, the amount Meralco customers were allegedly overcharged between the years 2008 and 2011 was at least P3.25 billion.

Source: Manila Times September 01, 2016 17:03 UTC