Claire WhitakerBy Claire Whitaker

Updated November 2026

The net metering law in the Philippines lets homeowners with rooftop solar send unused electricity back to the grid and receive credits against their monthly bill. This guide explains what the law covers, who qualifies, and the practical steps to take before and after installing a system. Use it to set realistic expectations for your household’s savings.

What the Net Metering Law Covers

The net metering framework in the Philippines is built on the Renewable Energy Act of 2008 (Republic Act No. 9513) and rules issued by the Energy Regulatory Commission (ERC) under its net metering rules. These rules set how a grid-connected home generator is paid for the power it exports. The core idea is simple: when your panels produce more than your home uses, the surplus flows to the distribution utility, and that energy offsets what you draw from the grid later.

Shopping for one? See our guide: Washington State Net Metering Law (2026): Which Is Better for Homeowners?.

The law applies to customer-generators connected to a distribution utility. Off-grid systems and standalone battery setups fall outside it. For the broader program structure, see Net Metering Program Philippines: How It Works and How to Apply.

Step 1: Confirm Your Eligibility and System Size

Before applying, check that your home is served by a distribution utility that accepts net metering interconnections. Your system must also fall within the capacity limits set by the ERC for residential customers. Installers and utilities usually ask for your average monthly consumption, so pull at least 12 months of bills first.

  1. Gather 12 months of electricity bills and note your average kWh use.
  2. Confirm your roof area, orientation and shading.
  3. Ask your installer to size the system to offset, not exceed, your annual use.
  4. Verify the system’s inverter is certified for grid interconnection.

Step 2: Understand How Credits Are Calculated

Under net metering, your meter runs forward when you draw power and backward when you export it. At the end of a billing period, the utility nets the two readings. If you exported more kWh than you imported, the surplus carries forward as a credit. Credits typically offset your energy charges, and the exact treatment of any leftover balance depends on the utility’s terms and the rules in force at the time.

A common example: if you import 300 kWh in a month and export 350 kWh, you carry a 50 kWh credit into the next billing cycle. Keep in mind that not every charge on a Philippine electricity bill is offset by net metering, so read your bill’s line items closely.

Step 3: Complete the Interconnection Application

Interconnection requires paperwork with your distribution utility and sometimes with the ERC. Most applications include a single-line diagram of your system, equipment specifications, a copy of your electrical permit, and an agreement covering the bidirectional meter. Your installer should prepare most of this, but review it yourself before submission.

Documents Usually Needed

  • Proof of ownership or lease of the premises
  • Electrical plans and single-line diagram
  • Inverter and panel datasheets
  • Signed interconnection agreement

Requirements change, so confirm the current list with your utility before you file. A licensed electrical professional should handle the wiring and the final inspection.

Common Mistakes to Avoid

  • Oversizing the system well beyond your annual use, which leaves surplus credits you may not fully recover.
  • Assuming credits cancel every line item on your bill. Several charges remain payable.
  • Skipping the bidirectional meter installation, which can delay approval.
  • Installing before the interconnection approval is issued.
  • Ignoring utility rules on how leftover credits expire or roll over.

FAQ

Does net metering apply to every home in the Philippines?

No. It applies to grid-connected customer-generators served by a distribution utility that follows ERC net metering rules. Off-grid homes are not covered.

Do unused net metering credits expire?

It depends on the utility’s terms and ERC rules in effect, so check your interconnection agreement. Ask your utility how carryover and any end-of-year settlement are handled.

Should I hire a professional for the application?

Yes, for wiring and inspection, a licensed electrician is required and strongly advised. Consult your utility or a qualified solar installer to confirm the current filing steps.

Conclusion

The net metering law in the Philippines rewards homeowners who size their systems to actual use and complete interconnection correctly. Start by reviewing your bills, confirm eligibility with your utility, and read the agreement before signing. Check current ERC rules periodically, since the framework can change.

Ready to choose one?

Claire Whitaker

About Claire Whitaker

Claire Whitaker is part of our editorial team and reviews and edits our home solar guides, checking product details against manufacturer specifications and owner feedback.