Rooftop solar adoption in the Philippines grew 340% between 2022 and 2025. But most solar owners are leaving significant value on the table — because panels alone only solve part of the problem. Combine solar with energy aggregation, and the math changes completely.
Key Takeaways
- Rooftop solar reduces the generation component of your bill — but distribution, transmission, and taxes remain unchanged.
- Energy aggregation provides a lower negotiated rate for the generation you still need from the grid.
- Together, Phase II participants (aggregation + solar) achieve approximately 16.46% additional savings on top of Phase I grid rates.
- Prosumers — households that generate and consume electricity — represent a new participant class in the Philippine energy market.
What solar alone doesn’t solve
A typical 5 kWp rooftop solar system in Metro Manila generates about 600–700 kWh per month. For a household consuming 1,272 kWh per month, that covers roughly 50% of energy consumption during daylight hours — significant, but incomplete.
The challenge is that solar only addresses part of the generation component of your electricity bill. When your panels aren’t producing — at night, during overcast days, or when demand exceeds generation — you’re back on the grid at standard rates. And the non-generation components (distribution, transmission, universal charges, taxes) are completely unaffected by having panels.
| Metric | Value |
|---|---|
| Rooftop solar growth since 2022 in Metro Manila | 340% |
| Average daytime energy offset for a 5 kWp system | ~50% |
| Total bill reduction at Phase III (solar + battery + aggregation) | 83.54% |
How aggregation complements solar
Energy aggregation works on the generation component — the 55% of your bill that covers the cost of the electricity itself. Through SunShare, residential and community customers negotiate generation rates collectively, accessing wholesale-like pricing that individual households can’t obtain alone.
For a solar owner, this means both sides of the equation are optimized:
- During the day: Your panels cover most generation needs. What little you pull from the grid comes at the aggregated rate — not the default utility rate.
- At night and on cloudy days: You draw from the grid at the negotiated Phase II rate — significantly lower than standard residential rates.
- When you overproduce: Excess generation is fed into the network. SunShare’s prosumer arrangement compensates participating solar owners for their surplus — creating a new income stream that the standard net metering scheme doesn’t fully capture.
“The solar panel on your roof is a generation asset. Aggregation is what connects it to a market. Without both, you’re solving half the problem and leaving half the value behind.”
— SunShare Energy Systems Team
The rise of the Philippine prosumer
A prosumer is a consumer who is also a producer of energy — typically a household or business with rooftop solar panels that generates more electricity than it needs at certain times. The term is new to most Filipinos, but the concept is rapidly becoming central to the Philippine energy transition.
Under EPIRA’s evolving regulatory framework, prosumers can participate in the electricity market in ways that were unavailable a decade ago. The key mechanisms:
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Net Metering — The Standard Starting Point
Under DOE and ERC rules, solar-equipped consumers can export surplus generation to the grid and receive a credit against their monthly bill. The credit rate is set by the ERC and updated periodically — currently approximately ₱6.50–₱7.40/kWh for residential net metering participants.
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RES Prosumer Program — The SunShare Model
Through SunShare, prosumers can register surplus generation with our aggregation pool. This surplus is allocated to offset the grid consumption of other members — increasing the effective value of your generation beyond what standard net metering achieves. Prosumer compensation under the SunShare model is tied to the pool’s actual generation savings rate rather than a fixed regulatory credit.
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Phase III Battery Storage — The Full Stack
Phase III participants add battery storage to the solar + aggregation combination. Batteries shift surplus daytime generation to peak evening hours — when grid prices are highest — and maximize self-consumption. Phase III achieves the highest savings: approximately 83.54% reduction in effective electricity costs compared to default utility rates.
The numbers: Phase by phase
Here’s how the cost reduction compounds across participation phases for a household with a ₱8,000 monthly electricity bill:
| Phase | What changes | Effective Rate | Monthly Savings |
|---|---|---|---|
| Default (Meralco) | No change | ₱13.49/kWh | — |
| Phase I · Grid Aggregation | Generation rate negotiated | ₱11.67/kWh | ₱1,082 |
| Phase I · Embedded | Aggregation with embedded generation | ₱11.08/kWh | ₱1,429 |
| Phase II · + Solar | Rooftop solar added to aggregation | ₱8.86/kWh | ₱2,743 |
| Phase III · + Battery | Battery storage completes the stack | ₱2.22/kWh | ₱6,686 |
Getting started: Does your home qualify?
Not every home is ready for Phase II immediately. Solar participation in SunShare’s aggregation network requires:
- An existing rooftop solar installation with net metering approval from your distribution utility
- A SunShare Phase I (grid aggregation) membership — you need to be on the aggregation before upgrading to Phase II
- Inverter compatibility with SunShare’s monitoring API (most tier-1 inverters are supported)
- Participation in the SunShare Prosumer Registry — a DOE-aligned record of residential embedded generators
Don’t have solar yet? You can join at Phase I (grid aggregation) now and upgrade to Phase II when you add panels. There’s no need to wait. Many members start saving at Phase I and install solar within 12–18 months once they see the combined economics.
The solar + aggregation combination isn’t theoretical — it’s the direction the Philippine energy system is moving. Early participants are already capturing the savings that this combination unlocks, while the broader market catches up.
