What Is a Licensed Electrical Worker (LEW) and Why Solar Needs One in Singapore
A Licensed Electrical Worker (LEW) is a qualified electrical professional registered with Singapore's Energy Market Authority who is legally authorised to certify electrical installations. Every Singapore solar installation requires LEW sign-off. Without it, the system cannot be legally energised or registered for ECIS.
Key Takeaways
- 1
Every grid-connected solar installation in Singapore requires sign-off by an EMA-registered Licensed Electrical Worker — without this, the installation is illegal and cannot be registered for ECIS export credits
- 2
The LEW's role is to certify that the electrical installation meets Singapore Standard SS 555 and SP Group's technical connection requirements — they are personally liable for the certification
- 3
Ask your solar installer to provide the LEW's EMA registration number before signing any contract — you can verify it on the EMA public register in under 60 seconds
Singapore's Electricity Act requires that all electrical installation work above a certain voltage threshold be carried out or supervised by a Licensed Electrical Worker, a person registered with the Energy Market Authority who has passed the EMA's examination and holds a valid practising licence. For residential solar, the LEW requirement is not optional, not waivable, and not something your installer can substitute with a different credential. Understanding what the LEW does, and what their sign-off actually certifies, protects you from the most consequential risk in a solar purchase: an uncertified installation that cannot be legally operated.
What the LEW Actually Does on a Solar Project
The LEW's role is technical and legal, not physical. They may or may not be on site during the installation itself, their core function is to supervise the electrical work, verify that it meets the required standards, and sign the electrical installation certificate (Form EI/1 or equivalent) that authorises the system to be energised.
Specifically, the LEW certifies that:
The DC wiring from panels to inverter meets the required cable ratings, termination standards, and protection against arc faults. The AC connection from inverter to the distribution board is correctly fused, earthed, and islanding-protected. The bi-directional meter connection meets SP Group's technical requirements. The overall system complies with Singapore Standard SS 555 (Code of Practice for Electrical Installations). The inverter and panels are on EMA's approved equipment list.
Why the LEW's Personal Liability Matters to You
An LEW signs their name and registration number against the installation certificate. If the installation subsequently fails an EMA inspection or causes an electrical incident, the LEW's personal licence is at risk, not just the installer's business. This personal liability creates a quality assurance mechanism that does not exist in unregulated trades: the LEW has a direct professional incentive to reject non-compliant work, because approving it puts their livelihood at stake.
This means a legitimate solar installation with LEW sign-off has been reviewed by someone with skin in the game, not just a company representative who moves on to the next project. It is the single most meaningful quality signal in a Singapore solar proposal.
What Happens Without a LEW
An installation without LEW sign-off cannot be legally energised. SP Group will not connect the system to the grid without the electrical installation certificate. The installer cannot submit the ECIS application without it. If an unlicensed installation is energised anyway and causes a fault, electrical fire, or injury, your home insurance may be voided (non-compliant installation), and the installer faces criminal liability under the Electricity Act, not just civil claims.
In practice, any established solar installer in Singapore has a working relationship with one or more LEWs on their team. The LEW cost is built into the installation fee, it should not be presented as an add-on. If an installer tells you the LEW sign-off is extra, or cannot name their LEW, treat this as a significant red flag. Ask for the LEW's EMA registration number and verify it on the EMA public register before signing any contract.
The LEW is not a bureaucratic box-tick. They are the person whose professional licence rides on the quality of your installation. That personal stake is the strongest quality assurance mechanism in Singapore's solar market.
The solar quote reading guide covers the other eight items to verify in a Singapore solar proposal. The full checklist is here. For your specific project and system sizing, run the Sunnify estimate.
Further reading: EMA LEW public register · SP Group electrical connection requirements.
Is the LEW the same as the solar installer? Can one person be both?
They can be the same person but are often different. Some solar installers hold their own LEW licence and self-certify their work. Others (more commonly) are solar specialists who subcontract the LEW certification to an electrician they work with regularly. Both approaches are legitimate under EMA regulations. What matters is that the LEW signing the certificate holds a current, active EMA registration number, regardless of whether they are employed by the installer or engaged separately. You should always receive the LEW's details (name and registration number) as part of the post-installation documentation.
What is the difference between an LEW and a regular electrician in Singapore?
A Licensed Electrical Worker holds a specific EMA-issued licence that qualifies them to carry out and certify electrical installation work above certain voltage thresholds. Regular electricians (without LEW status) can perform maintenance and repair work within prescribed voltage limits but cannot sign the installation certificates required for new installations, extensions, or grid connections. The LEW examination covers Singapore electrical standards, safety regulations, and the Electricity Act's requirements, it is substantially more demanding than trade apprenticeship alone. The LEW licence must be renewed periodically and can be suspended or revoked by EMA for non-compliance, making it a genuinely enforceable professional standard rather than a one-time qualification.
See your numbers
What does this mean for your home?
Tariffs and technology change the math. The calculator uses current SP figures to show your actual payback and savings.
