Laos–China–Thailand: Hydropower, a New Chessboard of Power

If oil dominated the twentieth century, electricity-its production, storage, and distribution-will indeed be at the heart of twenty-first-century stakes, especially in Southeast Asia. Up along the Mekong, the geopolitics of energy is being played through power-purchase agreements, grid concessions, and discreet alliances between conglomerates. Across ASEAN, hydropower generated in Laos accounted for about 3% of total electricity in 2023-a modest share, yet strategically significant at the regional level.

And the share already imported by Thailand is substantial. At the center of these flows, Gulf Energy Development, the group led by billionaire Sarath Ratanavadi, has established itself as Thailand's leading private operator on cross-border mega-dams.

First lock: contractual. On 13 September 2023, the state utility EGAT signed a twenty-nine-year power-purchase agreement (PPA) for Pak Beng (912 MW), with commercial operation targeted for 2033-barely a week after the new government was formed, an unusually rapid pace for an asset of this size. Estimated cost: about 100 billion baht (US$2.7-2.9 billion), with the entire output sold to EGAT-the archetype of guaranteed cash flow that secures private balance sheets while shifting risk onto the public payer.

The second lock is infrastructural. Since 2020, Laos's high-voltage transmission network (≥ 230 kV) is no longer operated directly by the state: it was granted in a twenty-five-year concession to EDL Transmission Company (EDLT), a joint venture controlled by the state-owned China Southern Power Grid, officially to ease debt and modernize equipment (https://www.reuters.com/article/business/exclusive-taking-power-chinese-firm-to-run-laos-electric-grid-amid-default-wa-idUSKBN25V14B/). Gulf is not a bystander: on the generation side, the group co-develops Pak Beng and secured a twenty-nine-year PPA with EGAT; it also took 100% control of Pak Lay in July 2025, likewise backed by a twenty-nine-year PPA. In practice: Gulf generates in Laos; the power transits across a network operated by a Chinese state-owned company; EGAT buys it in Thailand via multi-decade PPAs. It is an efficient architecture when everything works, but it narrows public room for manoeuvre whenever a link falls out of Thailand's control-payment disputes, poor hydrology, or political tensions.

Third lock: narrative. The real question is simple-does Thailand lack electricity? The reserve margin-the excess of capacity above peak, typically targeted around 15-20%-is already very high, around 36% in market assessments and higher in some studies, far above prudential levels. In other words, the country is not short of power: it already pays to maintain a large reserve while signing new twenty-nine-year import contracts that lock in the architecture and push back more flexible domestic options such as solar plus storage.

Interdependencies under strain

On Gulf's side, the build-up is methodical. In July 2025, the conglomerate acquired 100% of Pak Lay (770 MW) by buying the remaining 60% for US$128 million, backed by a twenty-nine-year PPA and targeting commercial operation in 2032. These commitments lock in quasi-guaranteed flows for Gulf over decades, since the public buyer commits for twenty-nine years. The more these PPAs stack up, the higher the opportunity cost of domestic alternatives becomes for Thailand.

Ultimately, the question is not whether Thailand will keep buying Lao electricity, but on whose terms. With twenty-nine-year contracts, a Lao grid concessioned for twenty-five years to a Chinese operator, and a still-timid national debate on optimising the mix, each newly signed dam narrows public policy latitude and deepens reliance on an architecture where private conglomerates and Chinese state-owned companies occupy key positions. It is a useful lens for understanding rising tensions in the region-and the levers of influence wielded by Gulf and Sarath Ratanavadi.