Net metering — application and approval

What net metering actually is

A standard electricity meter records energy flowing one way. A solar system that generates more than the site is consuming has nowhere to send the surplus, so it is wasted.

Net metering replaces that meter with a bi-directional one. Surplus generation is exported to the network and recorded, and that exported energy is credited against energy imported at other times. The commercial arrangement — what the credit is worth and how it settles — is set by regulation, not by the installer.

[TODO: VERIFY current NEPRA and LESCO net metering rules, credit treatment and settlement period at time of writing.]

What the process requires

1. A compliant design. The distribution company assesses the system design, protection arrangement and equipment against its own requirements. A system built without that in mind may need rework before it can be approved.
2. Documentation. Single-line diagram, equipment datasheets, and the application itself.
3. Inspection. The installation is inspected before the meter is changed.
4. Meter installation and commissioning. Export only begins once the bi-directional meter is fitted.

Who benefits from it, and who does not

Net metering is worth having in proportion to how much of your generation you cannot use as it is produced.

A site that consumes almost everything it generates during daylight — a factory on a day shift, an office, a shop — gains relatively little, because there is little surplus to export. The value of solar there is already being captured directly, and the strongest reason to apply is what happens on weekends and holidays, when the site is closed and the array is not.

A site that generates a large surplus at midday and draws most of its energy after sunset — a typical home — gains most. Without net metering that midday surplus is simply lost, and the evening consumption is bought at full price.

The sizing estimator asks about net metering directly, because the answer changes the system design rather than just the paperwork.

What the distribution company is checking

An application is assessed against the network’s requirements rather than against how well the system was built. In broad terms the review covers:

• System capacity against the sanctioned load of the connection, and against the connection phase.
• Equipment — that the inverter and protection arrangement meet the requirements in force.
• The single-line diagram, and whether the installation as drawn is coherent and safe.
• Protection and isolation, including anti-islanding behaviour, so the system cannot energise a dead network.
• Earthing, in the design and on inspection.
• The installation itself, at inspection, before the meter is changed.

An application fails on documentation far more often than on engineering. A complete, consistent submission is not a formality — it is the difference between one review cycle and several.

What is typically required

The exact list is set by the distribution company and changes from time to time. Typically it involves:

1. Proof of identity and of the connection — the applicant’s documents and a recent bill for the connection the system will be tied to.
2. The application form for the distribution company in question.
3. A single-line diagram of the proposed system.
4. Equipment datasheets for modules, inverter and protection devices.
5. Details of the installer and the installation.

We prepare the technical documentation, keep it consistent with what is actually installed, and support the submission. The application remains the connection holder’s — it is made in your name, against your connection, and we do not pretend otherwise.

Where the timeline actually goes

Nobody can promise an approval date, and an installer who does is describing a wish. The stages that consume the time are:

• Preparing a complete application, which is ours and is the fastest part when the design was done properly.
• The distribution company’s review, which depends on their queue.
• Inspection scheduling, which depends on their staff.
• Meter procurement and installation, which is frequently the longest single wait.

What we control is that nothing goes back for correction because of something we submitted. What we will not do is put a date on a stage owned by someone else.

Why applications stall

• The system was designed without the requirements in mind, and needs rework before it can be approved.
• Capacity exceeds what the connection permits, discovered after installation instead of before.
• Documents disagree with each other — a diagram showing one inverter and a datasheet for another.
• The installation does not match its own drawings, found at inspection.
• Ownership and billing details do not match the connection the application is made against.

Every one of these is avoidable at design stage, and expensive afterwards.

Hybrid systems and export

A battery-backed hybrid system can still export under net metering, but the design has to be deliberate about it: what charges the battery, what is exported, and how the backup circuits are separated. The approval process treats it as a grid-tied system with storage, and the documentation has to reflect what was actually built.

Why the design has to come first

Retrofitting a system to meet net-metering requirements after installation is more expensive than designing for them at the start. If net metering is a possibility, it belongs in the first conversation — which is why the sizing estimator asks about it directly.