What is system loss on a Meralco bill?
System loss is the charge for electricity that was made and paid for but never reached anybody’s meter. Some of it turns to heat in the wires and transformers between the power plant and your house. Some of it is stolen. The law lets a utility recover those losses from its customers, up to a ceiling the regulator sets.
It is one of the lines worth understanding before you look at solar, and it is part of what we go through in an energy audit, where the bill is read line by line before anything is sized. Once the bill makes sense, the solar panel calculator sizes a system from the kilowatt-hours on it, and how net metering works explains what an exported kilowatt-hour is credited at.
Where the lost electricity goes
Meralco’s own explanation splits it in two. System loss is the difference between the electricity power plants generate and the electricity customers consume.
- Technical losses
- Electricity flowing through wires generates heat. Power passes through several transformers on the way to you, and each takes a little. Voltage and stability problems on the network add a small amount more. Every grid has these; they can be reduced and never removed.
- Non-technical losses
- Electricity theft and illegal connections. The power was generated and delivered into the network, and nobody’s meter recorded it.
Source: Meralco, Bill Breakdown FAQs, the System Loss questions, read 5 October 2026.
How much of the bill it is
Meralco publishes how a typical bill divides between the people who are paid from it. System loss is about 5 percent. Most of a bill is passed through to others; Meralco’s own share for delivering the power and serving the account is the second line.
- Generation charge Goes to power generators
- 64%
- Meralco’s own distribution and customer charges Goes to Meralco
- 12%
- Taxes, subsidies and other charges Goes to the government and accredited agencies
- 11%
- Transmission charge Goes to the National Grid Corporation of the Philippines
- 8%
- System loss Goes to power generators and the grid operator
- 5%
Shares as Meralco states them in its Bill Breakdown FAQs and Breakdown of Charges. Your own bill will not match exactly; the split moves from month to month as the generation charge does.
The cap, and why you pay for theft
A utility cannot pass on every loss it suffers. Republic Act 7832, the 1994 law against electricity pilferage, set the first ceilings on how much system loss could be recovered from customers, stepping down each year after it took effect:
- Private utilities
- 14½%, then 13¼%, then 11¾%, then 9½%, over four years
- Electric cooperatives
- 22%, then 20%, then 18%, then 16%, then 14%, over five years
The same section let the regulator lower the caps further. Those 1994 figures are history: today the Energy Regulatory Commission sets the ceiling, and Meralco says losses beyond it are carried by the utility. We have not printed the current figure because the Commission’s website refuses our requests, and we would rather say that than quote one we have not read.
So theft does reach your bill, but only inside the cap. Above it, the utility pays. And Meralco says anything it recovers from people caught stealing power goes back to customers as a reduction in the generation charge.
It is not a Meralco invention. Meralco notes the charge is collected by every distribution utility and electric cooperative in the country, which includes the PELCOs in Pampanga, and the 1994 Act set separate caps for cooperatives from the start.
Source: Republic Act 7832, Section 10, read 5 October 2026.
What solar does to system loss
Meralco places system loss inside the generation and transmission costs: the part of the bill that follows how many kilowatt-hours you take from the grid. Take fewer and you pay less of it, in the same proportion as the generation charge itself.
There is a plain physical reason too. Power your panels make and the house uses at once never travels the network, so nothing is lost delivering it. It does not reduce the utility’s losses on everybody else’s power, and it does not make the line disappear while you still draw from the grid at night.
The most useful thing to do with a bill before solar is to find how many kilowatt-hours you use in daylight and how many after dark. The daylight share is what panels replace.
What people ask about system loss
What is system loss in a Meralco bill?
It recovers the cost of electricity that was generated and paid for but never reached a meter. Some is lost as heat in wires and transformers; some is stolen through illegal connections. Meralco describes it as part of the generation and transmission costs and says it collects the charge for power generators and the grid operator without earning from it.
Why do I pay for electricity other people steal?
Because the law allows a utility to recover losses up to a cap, and pilferage is one kind of loss. Losses above the cap cannot be passed on and are carried by the utility. Meralco says that whatever it recovers from people caught stealing power is returned to customers as a reduction in the generation charge.
Who sets the system loss cap?
The Energy Regulatory Commission. The first caps were written into Republic Act 7832 in 1994, stepping down each year, and the Act let the regulator lower them further. We have not quoted today’s figure because the Commission’s website refuses our requests and we would rather say that than guess.
Does solar reduce the system loss charge?
It reduces the part that follows the kilowatt-hours you take from the grid, and Meralco places system loss inside the generation and transmission costs, which is that part. Power your panels make and you use at home never travelled the grid, so no loss was incurred delivering it to you.
Send us a recent bill and we will read it with you
Tell us the kWh on your statement and what the property is. You will get a written answer on which lines solar would reduce, a size, and the next step.
Tell us the property and what you are trying to cut, and you will get a written answer with a size and a next step. No visit is booked and nothing is charged for asking.
Sources: Meralco, Breakdown of Charges and Bill Breakdown FAQs, read 5 October 2026; Republic Act 7832 (1994), Section 10, on lawphil, read 5 October 2026. This page explains a charge; it does not quote a rate.