Anatomy of a Meralco Bill
Before understanding what solar offsets, you need to understand your Meralco bill structure. It's not just "electricity" — it's a bundle of charges, only some of which are tied to your kWh consumption:
*Approximate breakdown for a residential customer using ~650kWh/month at ₱12.30/kWh blended rate. Actual breakdown varies by consumption level.
What Solar Actually Offsets
Solar generation directly reduces your net consumption from the grid. Every kWh your solar panels produce during the day is a kWh you don't buy from Meralco. This offsets the generation charge — which makes up about 55–65% of your total bill — plus a proportional share of the system loss charge.
The fixed charges (distribution, transmission, universal charge, government taxes) are either fixed per connection or applied proportionally to all consumption — including the kWh you still draw from the grid at night (for on-grid systems) or from battery (for hybrid). These cannot be reduced to zero by solar alone under current ERC rules.
Before vs After Solar: Real Numbers
For a homeowner with a ₱8,000/month Meralco bill and a correctly sized 6KW hybrid solar system:
That ₱400 remaining represents the fixed infrastructure charges that exist on every Meralco connection regardless of consumption. With net metering credits from daytime excess export applied against remaining charges, many solar customers bring their bill to the ₱300–₱500 range consistently.
The honest answer to "will solar eliminate my bill": Solar will eliminate 90–97% of your electricity cost. The remaining ₱300–₱600/month is the minimum charge for being connected to the Philippine grid — and there's no way around it while maintaining a grid connection. Most customers consider this acceptable for the grid backup it provides.
How Net Metering Helps Further
Without net metering, a homeowner who's at work during the day "wastes" excess solar generation (it flows to the grid for free). With net metering, that excess earns bill credits at your full retail rate — which can then offset the remaining fixed charges on your next bill.
A 6KW system in a home where occupants are away 8 hours per day might export 10–15kWh daily to the grid. At ₱11/kWh, that's ₱110–₱165/day in credits, or ₱3,300–₱4,950/month — more than enough to zero out the fixed charges and roll over into the following month's bill.
In practice, net metering customers on a correctly sized system see bills of ₱0–₱200 for most months — with credits rolling forward through the year.
Can You Actually Get to ₱0?
Getting to a literal ₱0 Meralco bill is possible — but only through net metering credit banking. When your accumulated credits exceed your fixed charges in a given month, your statement shows ₱0 due. This is common for solar customers in low-consumption months or when household occupancy drops (e.g., family travels).
However, expect ₱300–₱600/month as your realistic consistent minimum while you maintain a grid connection. That's not a failure — it's the cost of having the entire Philippine grid as your backup power source, available instantly whenever your solar or battery runs short.
Getting the Right Size to Maximize Savings
The biggest mistake in Philippine solar sizing is undersizing to save on upfront cost. A system that offsets 60% of your bill leaves 40% — including the most expensive variable charges — still running at full rate. The economics improve dramatically as you approach 90–100% offset.
- ₱3,000–₱5,000/month bill: 3KW system offsets 75–90%
- ₱5,000–₱10,000/month bill: 5–6KW system offsets 85–95%
- ₱10,000–₱20,000/month bill: 10KW system offsets 90–97%
- Above ₱20,000/month: 15–30KW; full engineering load analysis recommended
See Exactly What Solar Will Do to Your Bill
Enter your monthly bill in our calculator for an instant estimate — or book a free assessment for an exact projection based on your actual consumption data.