Thailand escalates household solar push to 10GW with new incentives
Thailand has officially doubled its public solar initiative from 5GW to 10GW, aiming to equip up to one million homes with rooftop systems by 2028. The move, approved by the National Energy Policy Council and backed by Finance Minister Ekniti Nitithanprapas, is the centerpiece of the country’s push to cut fossil fuel imports and stabilize household energy costs.
How households can join
The scheme targets residential rooftops with systems up to 5kW per electricity meter. Participating families will benefit from a revised net-billing arrangement that pays 2.20 THB per kWh for surplus power sold back to the grid. This rate applies for 20 years, matching the lifespan of most solar panels. Payments will be processed automatically by the Metropolitan Electricity Authority (MEA) or Provincial Electricity Authority (PEA).
To remove upfront costs, state-owned banks — Government Savings Bank, Government Housing Bank, and Bank for Agriculture and Agricultural Cooperatives — will fund installations. Repayments come directly from solar revenue, leaving households with zero initial outlay. Borrowers must own or have long-term tenancy in the property where the system is installed.
A tax incentive is also active: homeowners may claim up to 200,000 THB in personal income tax deductions for solar installations under 10kW, valid until the end of 2028. A one-time cash subsidy of up to 50,000 THB per household begins distribution in mid-October 2026, targeting those who register before funds are exhausted.
Simplified rules, faster access
The government has eliminated two major barriers: the requirement for an industrial license to install rooftop solar has been scrapped, regardless of system size. Meanwhile, building modification permits are no longer needed for systems below 1,000kW, easing approval for multi-unit dwellings.
Applications opened in August 2026 and closed on September 30. A dedicated online portal through MEA and PEA now handles all registrations. Installers and equipment models were pre-approved in a national registry. The first wave of installations began in July 2026, targeting 500MW of capacity on a first-come, first-served basis.
Grid upgrades lag behind demand
While rollout accelerates, grid infrastructure remains a weak link. Thailand’s current power network was designed for centralized generation, not millions of distributed producers. The Ministry of Energy and Ministry of Interior have been ordered to deliver a comprehensive grid-readiness plan within 30 days, covering smart metering, voltage regulation, and battery storage.
Analysts estimate the grid may require 30–40GW of battery storage to safely absorb the 10GW of solar input — far exceeding the government's 10GW BESS target by 2030. Without timely upgrades, voltage instability and reverse power flows could disrupt service, especially in rural substations.
Implementation hurdles persist
The government must install 70,000–110,000 systems per month between October 2026 and December 2027. That pace exceeds India’s national rooftop programme, which averaged 45,000 per month over two years. Challenges include:
• Low awareness: Many residents believe solar will eliminate bills overnight. Actual payback periods are typically 5–7 years.
• Credit barriers: Even with zero-down financing, some rural households lack formal property titles or bank account histories.
• Supply chain gaps: Despite import tax exemptions under review, key components like inverters remain imported, risking delays.
Deputy government spokesperson Lalida Periswiwatana confirmed in September 2026 that no nationwide installations have yet been fully completed. Data on actual connections remains unpublished. Officials stress the programme is a long-term transition, not an immediate cost-saver.
The 10GW goal is embedded in Thailand’s draft Power Development Plan 2026, which aims for half the nation’s electricity to come from clean sources by 2037. This household-focused expansion marks a shift from past solar drives that favored utility-scale plants over individual participation.
