NEM Solar Thailand 2026 — MEA vs PEA Feed-in Rates and Real ROI for Industrial Facilities

What Is NEM and Why It Matters for Thai Industrial Buyers

Net Energy Metering (NEM) is the mechanism that allows solar system owners to export surplus electricity to the grid and receive either a credit or direct payment in return.

For Thai factories paying high monthly electricity bills, NEM enables:

• Cost savings through self-consumption (using your own solar output first)
• Revenue from exporting surplus to MEA or PEA
• A materially shorter payback period compared to off-grid or no-export systems

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NEM Feed-in Rates 2026 — MEA vs PEA

Authority	Coverage Area	NEM Buyback Rate	Notes
MEA (Metropolitan Electricity Authority)	Bangkok, Nonthaburi, Samut Prakan	~฿2.20/kWh	Time-of-Use rates may vary
PEA (Provincial Electricity Authority)	All other provinces	~฿2.20/kWh	Subject to annual adjustment

⚠️ Important: The 2026 NEM rates referenced here are based on the most recent ERC announcement. Confirm current rates with your local electricity authority before making investment decisions, as tariffs are subject to policy review.

Compare with what you pay for grid electricity:

• TOU Peak rate (09:00–22:00): ฿4.50–5.50/kWh (medium-large industrial)
• Off-Peak rate: ฿2.60–3.00/kWh

→ Self-consumption saves approximately 2× more than exporting — always design the system to maximise self-use first.

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Real ROI Calculation — 100 kWp Factory Example

Assumptions:

• 100 kWp rooftop system, factory in Nonthaburi
• Annual generation: ~130,000 kWh (4.5 peak sun hours/day × 100 kW × 365 days × 0.79 PR)
• Installed cost: ~฿3,000,000 (฿30,000/kWp including inverter, racking, installation)
• Grid electricity cost (TOU Peak): ฿5.00/kWh

Split:

• Self-consumption 70%: 91,000 kWh × ฿5.00 = ฿455,000/year
• Export NEM 30%: 39,000 kWh × ฿2.20 = ฿85,800/year
• Total annual benefit: ฿540,800

Financial metrics:

• Simple payback = ฿3,000,000 / ฿540,800 = ~5.5 years
• IRR over 25-year panel life: ~12–15% (assuming electricity price increases)

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5-Step NEM Connection Process with MEA/PEA

Step 1 — Design and equipment selection

• Solar panels must be IEC 61215 and IEC 61730 certified
• Inverter must be IEC 62116 (anti-islanding) and IEC 61727 compliant

Step 2 — Submit grid connection application

• File with your local electricity authority office
• Documents required: land title or lease, construction permit (if applicable), single-line diagram

Step 3 — Grid capacity review

• The authority checks whether the local feeder has headroom for export (typically 30–60 days)

Step 4 — Installation and inspection

• Install using a licensed electrical engineer (วสท. credential required)
• Electricity authority inspects and installs a bi-directional net meter

Step 5 — Commissioning

• Sign NEM agreement with the authority
• Total timeline from application to energisation: 60–120 days

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IEC Standards Required for NEM Approval

Standard	Applies To	Purpose
IEC 61727	Every inverter	Defines utility interface (voltage, frequency, power factor limits)
IEC 62116	Every inverter	Anti-islanding — protects utility workers during grid outages
IEC 61215	Solar panels	Performance and durability qualification
IEC 61730	Solar panels	Safety qualification (minimum Fire Class C for rooftop)

⚠️ An inverter without IEC 62116 certification will not receive grid connection approval from MEA or PEA.

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Questions to Ask Your Solar Contractor Before Signing

• Are panels certified to IEC 61215 and IEC 61730?
• Is the inverter certified to IEC 62116?
• Does the contractor have NEM approval experience with the local electricity authority?
• Is the panel warranty linear over 25 years, guaranteeing ≥80% output?
• Is an engineering calculation report with licensed PE stamp included?

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📞 Free rooftop survey and NEM system design: +66 2-096-2118 | +66 83-494-6958 📍 Sahawatthanakit (1988) Co., Ltd. — Nonthaburi, Thailand Request a Solar Quote →