5 Mistakes That Get an MEA / PEA Supply Application Rejected

Applying to MEA or PEA for a new supply or a capacity upgrade should be routine — but applications stall or get bounced for the same handful of reasons, costing weeks each time. After running these across Bangkok and the EEC, here are the five that keep showing up, and how to avoid them.

1. Incomplete or inconsistent documentation

Missing land documents, an out-of-date factory licence, no authorised-signatory paperwork, or details that don't match across forms. The utility can't process what doesn't add up. Fix: assemble the full document checklist on day one and cross-check that names, addresses and capacities are identical everywhere.

2. A single-line diagram that doesn't match the design

If the SLD, the load schedule and the equipment specification disagree — or the drawing isn't signed by a licensed engineer — it gets queried. Fix: submit a current, dated SLD signed by a Council of Engineers Thailand–licensed PE, consistent with the rest of the package.

3. Load calculation that's wrong or unjustified

Under-stated load (to look cheaper) or over-stated load (with no basis) both raise flags and store up problems. Fix: a defensible load calculation — connected load, demand factors, future growth — that the reviewer can follow.

4. Applying in the wrong territory

Submitting to MEA for a site that PEA serves (or vice versa) wastes weeks. The authority is determined by location: MEA covers Bangkok, Nonthaburi and Samut Prakan; PEA covers everywhere else. Fix: confirm the territorial authority before you start — see our MEA vs PEA guide.

5. Starting too late

The application has a real lead time — typically 8–16 weeks for an upgrade needing an MV transformer — and treating it as a last step instead of an early one delays energisation and everything downstream. Fix: start the supply application in parallel with design, not after equipment is ordered.

Get it right the first time

Most rejections are avoidable with a complete, consistent, professionally-prepared package submitted to the right authority, early. ETES handles MEA and PEA applications end-to-end as part of industrial electrical and customer-substation work — load calculation, SLD, submission, inspection and energisation.

FAQ