Solar Rooftop & Net MeteringSilver report

Published May 2026Insight Research21 min read2026-202717 sources, 17 primary-gradeVery high source depth

Thailand Solar Rooftop & Net Metering 2027 Market Intelligence

Thailand enters 2026 with ~3.5 GW cumulative rooftop solar against PDP 2024's ~12 GW rooftop allocation by 2037. Net-metering pilot (MEA, PEA Q4 2025), corporate PPA expansion, and ESS bundling reframe the 2027 playbook.

Key takeaways

1
Thailand approaches 2027 with ~3.5 GW of cumulative rooftop solar installed against PDP 2024's ~36 GW total solar target by 2037 (rooftop share ~12 GW). Rooftop is the most under-deployed segment relative to plan.
2
Net-metering pilot launched Q4 2025 via MEA (Bangkok metro) and PEA (provincial) under ERC oversight — finalising a residential and SME compensation regime that has gated installer-scale economics for a decade.
3
Installer landscape: SCG Solar Roof Solutions, Banpu NEXT Solar, Gunkul Engineering (SET: GUNKUL), BCPG (SET: BCPG), Solar Power 9 / SPCG (SET: SPCG), Solartron (SET: SOLAR), Schneider Electric Thailand, and Energy Absolute (SET: EA) lead a fragmented top tier; ~ of installs sit in a long tail of regional EPCs.
4
ESS bundling is the structural unlock — LG Energy Solution residential RESU packs and SVOLT, CATL-grade C and I packs reframe payback economics now that BOI BESS incentives narrow upfront cost gaps.
5
Corporate PPA expansion under the ERC Direct PPA pilot opens behind-the-meter private-wire structures for large industrial customers (EEC factories, data centres), accelerating the C and I segment ahead of residential.

Executive summary

Thailand enters 2026 with roughly 3.5 GW of cumulative rooftop solar installed, against a Power Development Plan 2024 (PDP 2024) trajectory that allocates approximately 36 GW of total solar capacity by 2037 — with a rooftop sub-component of around 12 GW. Rooftop is the most under-deployed segment relative to plan: cumulative installs have grown from ~1.4 GW in 2021 to ~2.9 GW in 2024, leaving 8-9 GW of headroom against the 2037 rooftop allocation alone.^{[, ]}

The 2027 thesis hinges on three policy shifts already in motion. First, the Energy Regulatory Commission (ERC) net-metering and net-billing pilot launched Q4 2025 via Metropolitan Electricity Authority (MEA, Bangkok metro) and Provincial Electricity Authority (PEA, provincial) — finalising the compensation regime that has been the binding constraint on residential and SME scale-up since the first FiT cycles. Second, BOI's February 2026 promotion package extends tax incentives to rooftop EPC services and battery energy storage system (BESS) deployment, materially compressing payback. Third, the ERC Direct PPA pilot creates a behind-the-meter and private-wire framework for corporate PPAs that finally lets large industrial customers (EEC factories, hyperscale data centres) procure rooftop and adjacent renewable supply at scale.^{[, , , ]}

Installer landscape is fragmented at the top. SCG Solar Roof Solutions (conglomerate retail-channel reach), Banpu NEXT Solar (C and I EPC with SVOLT-cell ESS bundling), Gunkul Engineering (SET: GUNKUL), BCPG (SET: BCPG), Solar Power 9 / SPCG (SET: SPCG), Solartron (SET: SOLAR, domestic module manufacturer), Schneider Electric Thailand (inverter, EcoStruxure microgrid), and Energy Absolute (SET: EA) lead a top tier where no single installer holds more than ~ share. A long tail of regional EPCs and foreign entrants accounts for roughly of installs. Our base case puts cumulative rooftop at ~6.0 GW by end-2027 — still well below the 12 GW PDP 2024 trajectory implied for 2037 but materially above the trend-line pace of 2021-2024.^{[, , , , , , , ]}

EPPO PDP 2024, ERC, MEA, PEA, BOI, SET factsheets, IEA, IRENA

Data as of: Q1 2026

Cumulative Thai rooftop solar capacity (GW, 2021-2027E)

2021

Cumulative GW

1.4

Context

FiT residential phase exhausted; SPP corporate buying flat

2022

Cumulative GW

1.9

Context

Diesel-cost shock pulls C and I self-consumption forward

2023

Cumulative GW

2.4

Context

BOI extends solar EPC incentives; SCG Solar Roof scales

2024

Cumulative GW

2.9

Context

Banpu NEXT, Gunkul C and I pipeline accelerates

2025E

Cumulative GW

3.5

Context

ERC net-metering pilot launches via MEA, PEA in Q4

2026E

Cumulative GW

4.6

Context

Net-metering pilot stabilises; BOI BESS package activates

2027E

Cumulative GW

6.0

Context

C and I PPA expansion; residential pilot graduates to nationwide

Year	Cumulative GW	Context
2021	1.4	FiT residential phase exhausted; SPP corporate buying flat
2022	1.9	Diesel-cost shock pulls C and I self-consumption forward
2023	2.4	BOI extends solar EPC incentives; SCG Solar Roof scales
2024	2.9	Banpu NEXT, Gunkul C and I pipeline accelerates
2025E	3.5	ERC net-metering pilot launches via MEA, PEA in Q4
2026E	4.6	Net-metering pilot stabilises; BOI BESS package activates
2027E	6.0	C and I PPA expansion; residential pilot graduates to nationwide

EPPO PDP 2024, IEA Thailand, ERC pilot data, installer disclosures, Insight estimates

Data as of: 2025 reported, 2026-27 modeled

Customer segment mix (% of 2025E rooftop installs)

Large industrial (factories, EEC, data centres)

Share %

46%

Notes

EEC factories, hyperscale DCs; corporate PPA-led

SME commercial (retail, hospitality, cold chain)

Share %

28%

Notes

Self-consumption-led; refrigeration, retail load profiles

Residential (single homes, condo associations)

Share %

17%

Notes

Gated by net-metering compensation; pilot accelerates 2026E

Public sector (schools, government rooftops)

Share %

Notes

BOI-supported; school and ministry rooftop programmes

Customer segment	Share %	Notes
Large industrial (factories, EEC, data centres)	46%	EEC factories, hyperscale DCs; corporate PPA-led
SME commercial (retail, hospitality, cold chain)	28%	Self-consumption-led; refrigeration, retail load profiles
Residential (single homes, condo associations)	17%	Gated by net-metering compensation; pilot accelerates 2026E
Public sector (schools, government rooftops)	9%	BOI-supported; school and ministry rooftop programmes

ERC pilot enrollment, MEA, PEA programme stats, installer disclosures

Data as of: 2025E

Analyst framing

Why this report

Thai rooftop solar has been gated for a decade by compensation-regime uncertainty. The ERC net-metering pilot through MEA, PEA in Q4 2025 finally resolves the residential and SME bottleneck; BOI BESS incentives and the Direct PPA pilot do the same for C and I. 2027 is when the curve starts bending toward the PDP 2024 trajectory.

Operator playbooks

SCG Solar Roof Solutions (SCG conglomerate): the broadest residential and SME channel in Thailand, bundling panels, mounting structure, inverter, and SCG Smart Home monitoring through SCG retail outlets. SCG's brand and dealer network translate directly into customer acquisition cost advantage; the binding constraint historically was net-metering compensation rather than channel, which 2025-2026 pilots now resolve. Strategic: scale leader by installer-share (~14%) heading into 2027.

Banpu NEXT Solar (Banpu PCL subsidiary): C and I rooftop EPC focus with PPA structures and BESS bundling via the SVOLT cell partnership. Banpu NEXT's positioning as the energy-transition arm of a legacy coal group gives it credibility with industrial customers running ESG transitions. Strategic: ESS bundling differentiator, plus regional ASEAN rooftop expansion via Banpu group footprint.

Gunkul Engineering (SET: GUNKUL): listed renewable EPC with rooftop, wind, and corporate PPA pipeline. Active in private-wire and behind-the-meter structures targeting EEC industrial customers. Strategic: leveraged play on the Direct PPA pilot; rooftop is one of three growth vectors alongside wind and battery storage.

BCPG (SET: BCPG): Bangchak group renewable platform with rooftop C and I exposure across Thailand and select ASEAN markets (Japan, Philippines, Vietnam). Cross-sell into Bangchak's industrial customer base and retail-station rooftop sites. Strategic: regional diversification offsets Thai-market timing risk on net-metering rollout.

Solar Power 9 / SPCG (SET: SPCG): Thailand's earliest listed solar developer; transitioning from ground-mount FiT legacy toward C and I rooftop and corporate PPA structures. Brand recognition and balance-sheet depth, but rooftop pivot is still in execution. Strategic: re-rating candidate if the C and I pipeline materialises.

Solartron (SET: SOLAR): domestic PV module manufacturer plus EPC services; supplies residential and SME installers with locally fabricated panels. BOI-supported local-content advantage as government procurement starts favoring domestic modules. Strategic: hedged exposure to Thai-content procurement and SME installer wave.

Schneider Electric Thailand: inverter, monitoring, and EcoStruxure microgrid integration for Thai C and I rooftop customers. Channel partner rather than end-installer; serves through Thai EPC partners. Strategic: picks-and-shovels exposure to the C and I segment; the EcoStruxure microgrid stack extends naturally into ESS bundling.

Energy Absolute / EA (SET: EA): solar generation footprint alongside EA Anywhere EV-charging network and Amita Tech battery manufacturing. Co-location of rooftop solar with EV-charging infrastructure is a credible differentiator for retail and fleet customers. Strategic: integrated rooftop, BESS, EV adjacency play; execution depends on EA's broader capital position.

Rooftop installer concentration (2025E install-share estimate)

SCG Solar Roof Solutions

Share %

14%

Kind

Conglomerate

Notes

Retail channel reach; residential, SME lead

Banpu NEXT Solar

Share %

12%

Kind

Corporate

Notes

C and I EPC plus SVOLT ESS bundling

Gunkul Engineering

Share %

11%

Kind

Listed EPC

Notes

SET: GUNKUL; rooftop, wind, PPA pipeline

BCPG, Bangchak

Share %

Kind

Listed

Notes

SET: BCPG; Bangchak group integration

Solar Power 9 / SPCG

Share %

Kind

Listed

Notes

SET: SPCG; ground-mount legacy plus C and I pivot

Solartron

Share %

Kind

Listed manufacturer

Notes

SET: SOLAR; domestic panel maker and EPC

Schneider Electric Thailand (EPC channel)

Share %

Kind

Foreign OEM

Notes

Inverter, EcoStruxure microgrid stack

Energy Absolute (EA Solar)

Share %

Kind

Listed

Notes

SET: EA; EV-charging co-location

Other (regional EPCs, foreign entrants)

Share %

30%

Kind

Long tail

Notes

Regional installers, JinkoSolar, LONGi distributors

Installer	Share %	Kind	Notes
SCG Solar Roof Solutions	14%	Conglomerate	Retail channel reach; residential, SME lead
Banpu NEXT Solar	12%	Corporate	C and I EPC plus SVOLT ESS bundling
Gunkul Engineering	11%	Listed EPC	SET: GUNKUL; rooftop, wind, PPA pipeline
BCPG, Bangchak	9%	Listed	SET: BCPG; Bangchak group integration
Solar Power 9 / SPCG	8%	Listed	SET: SPCG; ground-mount legacy plus C and I pivot
Solartron	6%	Listed manufacturer	SET: SOLAR; domestic panel maker and EPC
Schneider Electric Thailand (EPC channel)	5%	Foreign OEM	Inverter, EcoStruxure microgrid stack
Energy Absolute (EA Solar)	5%	Listed	SET: EA; EV-charging co-location
Other (regional EPCs, foreign entrants)	30%	Long tail	Regional installers, JinkoSolar, LONGi distributors

ERC pilot enrollment, company disclosures, EPC channel data, Insight estimates

Data as of: 2025E

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