Isan Renewable Energy: Solar, Wind & Biomass in the Northeast

Isan is home to 22 million people, roughly a third of Thailand’s population (The Isaan Record (21 Apr 2025)). It’s also where much of the country’s clean power is being built. Wind farms line the Korat plateau, solar arrays float on dam reservoirs, and cane and cassava fields feed biomass plants. Yet the region still earns far less than the rest of the country. So who actually benefits?

This guide walks through Isan renewable energy source by source. You’ll see what’s operating, what’s only proposed, and what it means if you live in the Northeast.

TL;DR: Isan is Thailand’s renewable heartland. It hosts five wind farms of up to 450 MW in Nakhon Ratchasima and Chaiyaphum (Eco-Business), floating solar on its dams, and 54% of the country’s cassava area (Krungsri Research (Industry Outlook 2024-2026: Cassava, Feb 2024)), a major biomass feedstock. Homeowners there can also join the 2026 rooftop solar buyback round at 2.20 THB/kWh (MEA).

Why Is Isan Thailand’s Renewable Energy Heartland?

Isan combines three things few other regions have at once: open land, steady wind on its plateau, and huge volumes of farm waste. Northeast Thailand grows 54% of the country’s harvested cassava area (Krungsri Research (Industry Outlook 2024-2026: Cassava, Feb 2024)). That mix lets one region supply wind, solar and biomass power together, which is rare.

Land is the quiet advantage. Large solar and wind projects need space, and the Northeast has plenty of open farmland compared with the crowded central plains.

Agriculture matters just as much. Sugarcane and cassava leave behind leaves, stalks and peel after harvest. Burning them in fields causes smoke. Burning them in a power plant makes electricity instead.

Here’s the pattern most coverage misses. Isan’s three energy sources don’t depend on the same thing. Solar needs sun, wind needs elevation, and biomass needs a harvest. A cloudy week or a still month hits one source without stopping the other two. That’s a sturdier base than any single technology could give a region.

How Much Wind Power Does Isan Produce?

Isan is the centre of Thai wind energy. Wind Energy Holding’s five wind farms in Nakhon Ratchasima and Chaiyaphum provinces add up to 450 megawatts to the national grid (Eco-Business). Wind still makes up only around 3% of Thailand’s installed capacity, about 1.5 gigawatts in total (Eco-Business (Dialogue Earth explainer, Sep 2025)).

That gap between local importance and national share is the story of Isan wind. One company’s projects in two provinces account for a large slice of the country’s total. Developers chose the plateau’s higher ground for its wind exposure.

How much more could the region build? Estimates suggest 13-17 gigawatts of onshore wind potential across the country (Eco-Business (Dialogue Earth explainer, Sep 2025)), much of it in the north and northeast. Draft planning has floated an additional 7GW of wind power (Eco-Business (Dialogue Earth explainer, Sep 2025)). Treat that as a proposal, not a commitment, since the plan hasn’t been finalised.

Wind projects also bring land-lease income to farmers. A turbine takes up little ground, so cassava and rice can still grow around its base.

What Makes Northeast Solar Different?

Northeast solar stands out because much of it floats. EGAT’s 45 MW Hydro-Floating Solar Hybrid Project at Sirindhorn Dam in Ubon Ratchathani began commercial operation on October 31, 2021 (RE Global (reglobal.org)). It pairs panels on the reservoir with the dam’s existing hydropower turbines and transmission lines.

The model is spreading. EGAT is setting up a 24 MW project at Ubol Ratana Dam in Khon Kaen (RE Global (reglobal.org)). Nationwide, it plans 15 more projects totalling 2,725 MW (RE Global (reglobal.org)). Many large reservoirs sit in Isan, so the region is well placed to host more.

Ground-mounted farms are growing too. Gulf’s solar farm in Surin province has an installed capacity of 68 MW, with 51.0 MW contracted to the grid (SolarQuarter).

Floating solar solves Isan’s biggest land conflict. Farmland feeds families, and nobody wants to give it up for panels. A reservoir surface earns nothing on its own. Putting panels on water also cools them, and the dam’s hydropower can fill in when clouds pass over.

Nationally, solar’s installed capacity was just 3.4 GW as of 2024 (Ember). Thailand’s solar potential is about 300 GW (Ember). The distance between those two numbers shows how early the build-out still is.

Can Isan Biomass Replace Field Burning?

Biomass turns Isan’s crop waste into power instead of smoke. The Office of the Cane and Sugar Board expects procurement of sugarcane leaves for power to rise from 2.14 million tonnes in the 2025–26 crop year to around 5 million tonnes in 2026–27 (BioEnergy Times (18 Mar 2026, citing OCSB Sec-Gen)). Paying for leaves gives growers a reason not to burn them.

Isan grows a large share of both main feedstocks. The Northeast’s share of national sugarcane production reached 46% in the 2018/19 season (The Isaan Record (citing OCSB, Sep 2019)). For cassava, Nakhon Ratchasima alone covers 13.3% of Thailand’s harvested area (Krungsri Research (Industry Outlook 2024-2026: Cassava, Feb 2024)).

Cassava peel and wastewater from starch factories also feed biogas digesters. Sugar mills burn bagasse, the fibre left after crushing cane, to run their own boilers. Many sell surplus electricity to the grid.

Isn’t burning crop waste just another form of pollution? It’s cleaner than open-field burning. A power plant burns fuel at controlled temperatures with emission controls, while field fires release smoke straight into the air. That matters in Isan, where dry-season haze is a yearly health problem.

Does Isan Benefit From the Power It Produces?

Not yet, at least not evenly. Isan’s gross regional product per person was 86,170 baht a year, the lowest in Thailand (The Isaan Record (21 Apr 2025)). The national average was 243,787 baht (The Isaan Record (21 Apr 2025)). That puts Isan at about 35% of the national figure (Derived from S19, S20).

This is the Isan paradox. The region hosts wind farms, dam-top solar and biomass plants, but most of their value flows out. Projects are owned by large listed companies, and the electricity is sold into a national grid. Local gains mostly come from land leases, short-term construction jobs and crop-waste sales.

Biomass may spread income the widest. Every tonne of cane leaves or cassava waste bought for power puts money into a farm household’s pocket. Wind and utility solar, by contrast, pay a smaller number of landowners.

What Does Thailand’s Renewable Energy Policy Mean for Isan?

National renewable energy policy will shape how much more Isan builds. The 2024 draft Power Development Plan aims to boost renewables to 51% of electricity production, up from 36% under PDP 2018 (Nation Thailand (18 Jun 2024)). That draft lists wind at 5,345 MW (Nation Thailand (18 Jun 2024)) and solar at 24,412 MW (Nation Thailand (18 Jun 2024)).

These are targets in a draft plan, not law. Thailand’s power plans have been revised several times, and none of these figures is a binding order. Still, any serious push toward them runs straight through the Northeast’s land, wind and farm waste.

Natural gas still dominates generation, at around 68% (Ember). Imports matter too. Thailand has agreed to buy 10,500 MW of electricity from Laos (Eco-Business (Dialogue Earth opinion, Aug 2023)), and Laos sits directly across the Mekong from Isan. That makes the Northeast the natural gateway for imported hydropower.

For households, the most direct opportunity is rooftop solar. The 2026 residential buyback round pays 2.20 THB/kWh for exported power (MEA). It has a national quota of 500 MW (MEA) and caps exports at 5 kW per meter (MEA). Applications are first-come, first-served, so check with PEA before assuming quota is still available.

What Should Isan Residents Watch Next?

Three developments will decide how Isan renewable energy grows. The first is the draft power plan’s 51% renewables goal (Nation Thailand (18 Jun 2024)). If it’s approved, it would lock in demand for northeast solar and Isan wind for more than a decade. If it keeps slipping, projects slow down.

The second is crop-waste buying. The cane board’s move toward around 5 million tonnes of leaves (BioEnergy Times (18 Mar 2026, citing OCSB Sec-Gen)) could become a steady side income for growers. Watch whether mills and power plants post fair, published prices for leaves and stalks. That’s what turns a pilot into a habit.

The third is your own meter. The rooftop round is the one part of this story an ordinary household can join directly.

Practical steps for homeowners

• Check your daytime use. Panels pay back fastest when you use most of the power yourself, not when you export it.
• Ask PEA about quota. The round is first-come, first-served, and quota won’t last forever.
• Get two or three installer quotes. Ask each installer which inverter they use and whether it’s on PEA’s approved list.
• Plan for heat and dust. Isan’s dry season leaves a film on panels, so budget for regular cleaning.

Frequently Asked Questions

What is the biggest renewable energy source in Isan?

Wind is the region’s best-known source. Wind Energy Holding’s five farms in Nakhon Ratchasima and Chaiyaphum total up to 450 megawatts (Eco-Business). Solar and biomass are growing fast, though. Floating solar on dams and biomass from cane leaves are expanding across the Northeast.

Where is the floating solar farm in Isan?

The flagship project is at Sirindhorn Dam in Ubon Ratchathani. It’s a 45 MW hybrid that began commercial operation on October 31, 2021 (RE Global (reglobal.org)). EGAT is also setting up a 24 MW project at Ubol Ratana Dam in Khon Kaen (RE Global (reglobal.org)), with more reservoirs planned across the country.

Why is Isan important for biomass energy?

Isan grows much of Thailand’s energy crops. The Northeast holds 54% of the country’s harvested cassava area (Krungsri Research (Industry Outlook 2024-2026: Cassava, Feb 2024)) and produced 46% of national sugarcane in 2018/19 (The Isaan Record (citing OCSB, Sep 2019)). Crop leaves, peel and bagasse from these harvests can fuel power plants instead of being burned in fields.

Can Isan homeowners sell solar power to the grid?

Yes, under the 2026 residential rooftop round, while quota lasts. It pays 2.20 THB/kWh for exported electricity (MEA), with exports capped at 5 kW per meter (MEA). Isan homes apply through PEA. The round is first-come, first-served, so apply early and confirm quota is still open.

Conclusion

Isan already carries a large share of Thailand’s clean energy, and draft national plans point to much more.

• Wind: up to 450 MW from WEH’s Korat and Chaiyaphum farms (Eco-Business), with large untapped potential.
• Solar: floating projects on Isan dams avoid farmland conflicts, led by 45 MW at Sirindhorn (RE Global (reglobal.org)).
• Biomass: cane-leaf procurement is set to rise toward around 5 million tonnes (BioEnergy Times (18 Mar 2026, citing OCSB Sec-Gen)), turning field burning into income.
• The gap: Isan’s income per person is about 35% of the national average (Derived from S19, S20).

If you live in the Northeast, start with your own roof. Check your PEA eligibility for the rooftop buyback round, and watch the draft power plan as it moves toward approval.