Thailand's 2.20 Baht Export Rate Is a Floor, Not a Ceiling: What the New Solar Policy Actually Means

The Bangkok Post reports that Thailand's government has launched a program allowing households with rooftop solar to sell excess power to the Metropolitan Electricity Authority and Provincial Electricity Authority at a fixed rate of 2.20 baht per kilowatt-hour for 10 years, with a cap of 5 kilowatts per meter.^[1] On its face, this is progress: the country's first formal feed-in tariff for small solar. But the export rate and the structure deserve a harder look, because the same playbook has been run in U.S. states with predictable results.

The 2.20 baht rate (about $0.06 USD per kWh at current exchange rates) is low compared to Thailand's average retail electricity rate of roughly 3.5 to 4 baht per kWh. That gap means a solar household is selling power at a wholesale-like price while buying it back at a retail price. This is net billing, not net metering, and the arithmetic matters. Under California's NEM 3.0, the export rate was cut by roughly 75% from the retail credit, and residential solar sales collapsed.^[2][5] Thailand's program creates a similar incentive: self-consumption is the only way to capture full value, which pushes households toward batteries and larger systems, but the 5 kW cap and the 10-year contract lock in a low return. The government's framing of “cutting power bills” is accurate only if the system displaces consumption; for exported power, the compensation is thin.

The cost-shift argument has already surfaced in U.S. debates, with utilities claiming non-solar customers subsidize solar owners. But independent studies, including Lawrence Berkeley National Laboratory's reviews, find that at current penetration levels the net effect on retail rates is negligible, often a rounding error beside fuel price swings and utility capital programs.^{[research library]} Thailand's program, by capping exports at 5 kW and paying a fixed rate, avoids the worst of the cost-shift framing, but it also undervalues the benefits distributed solar provides: avoided generation and fuel costs, deferred transmission and distribution upgrades, reduced line losses, and environmental and health benefits. A proper value-of-solar study would likely find the 2.20 baht rate is below the true value stack, meaning the policy leaves money on the table for both households and the grid.

Who wins? The state utilities, which secure low-cost generation with no capital outlay and no long-term liability beyond the 10-year contract. Households win only if they can self-consume most of their generation; exporters will see modest returns. The losers are households that cannot afford solar, who will see no direct benefit from the program unless the avoided utility costs flow back as lower rate increases. And the real loser may be the potential for distributed solar to scale: a low export rate, combined with a 5 kW cap, signals that rooftop solar is a niche supplement rather than a grid resource. For comparison, Minnesota's value-of-solar study found distributed generation worth above retail rate when all benefits were counted, and Austin Energy's study landed similarly.^{[research library]} Thailand's rate is a political compromise, not a technical optimum.

The concrete alternative: Thailand should commission an open, transparent value-of-solar study that accounts for avoided energy costs, capacity value, transmission and distribution deferral, line losses, fuel price hedging, and environmental benefits. Then set the export rate at or near that value, and allow net metering or time-varying export rates that reward power sent during peak periods. The 5 kW cap should be raised or eliminated to avoid stifling larger systems. And the program should be designed as a stepping stone to a full net-metering framework, not a ceiling. Without these adjustments, Thailand risks locking in a low-deployment future, repeating the U.S. pattern where export-rate cuts kill the market, as California's NEM 3.0 did, or as Arizona and other states have done.^[3][5]