Hormuz Blockade Transmits Energy Spot Price: Japan's Q2 Wholesale Electricity Price Rises 30%, Potential for Another 40% Increase in H2

A recent report from the International Energy Agency (IEA) has once again brought the "geopolitical premium" of Asian energy spot prices into the spotlight: due to the disruption of Middle Eastern Liquefied Natural Gas (LNG) supplies caused by the ongoing blockade of the Strait of Hormuz, the average wholesale electricity spot price in Japan reached $90 per 1,000 kWh in the second quarter of 2026, marking an approximate year-on-year increase of 30%. The report forecasts that as the heatwave drives up electricity demand and the blockade becomes prolonged, the average wholesale electricity price in Japan will rise to $105 per 1,000 kWh in the second half of the year, with the year-on-year increase potentially expanding to about 40%. How One Strait is Driving Up Japan's Electricity Prices The Strait of Hormuz is a vital artery for global energy transport, handling vast amounts of crude oil and LNG shipping trade. Since mid-2026, military actions by the United States and Israel against Iran, coupled with maritime blockades by the US, have continuously deteriorated the safety of passage through the strait, leading to a stagnation of Middle Eastern LNG exports and a simultaneous rise in global energy transport costs and risk premiums. In early August, Iran and Oman reached an agreement on shipping routes through the strait, establishing temporary channels expected to be usable for 2 to 4 months; however, Iran emphasized that "threatening actions" such as the US maritime blockade persist, and the security situation in the strait has not fundamentally improved. In other words, the pressure from geopolitical disturbances on energy prices will remain volatile, and the market's pricing logic of "supply disruption—price hike" is not easily resolved in the short term. Why is Japan's Electricity Price So Sensitive to the Strait's Situation? Data from the Japanese Agency for Natural Resources and Energy shows that thermal power generation using LNG accounts for about 30% of Japan's total power generation, making electricity prices highly linked to the international LNG market. Although Japan imported about 4 million tons of LNG via the Strait of Hormuz in 2025, which accounted for only about 6% of the total annual imports, the impact of supply interruptions from the Middle East is amplified through global LNG spot prices—every penny increase in fuel costs is rapidly transmitted to the wholesale price through the marginal bidding on the power generation side. The Transmission Chain: LNG Spot Prices Surge, Electricity Prices Rise The price increases at the fuel level have already been confirmed in the spot market. According to Reuters investigations, the average spot price of LNG in Northeast Asia delivered in August rose from $16.4 per million British thermal units (MMBtu) a week prior to $18 per MMBtu, a near 10% increase in a single week. Rystad Energy statistics show that the price of East Asian LNG delivered in October on August 3rd was $20.4 per MMBtu, a slight increase of 0.4% month-on-month, with high temperatures and geopolitical risks still supporting buyer demand in the spot market. The rise in LNG costs has directly driven up the marginal cost of gas-fired power generation in Japan. At the same time, the demand side is also "adding fuel": the sustained high temperatures in Japan in late July boosted cooling electricity demand, causing the national spot electricity price to rise by 9% month-on-month to 21.57 yen per kilowatt-hour (approximately 13 US cents), reaching a high since early June. The IEA explicitly stated in its report that the trend of rising electricity prices is difficult to reverse in the short term due to the combination of heatwave demand growth and prolonged blockade. It can be said that Japan's current surge in energy spot prices is the result of the combined effect of "cost push" and "demand pull." It is worth noting that this round of electricity price increases is not solely due to climate disturbances. The IEA forecasts that global power consumption will rise from 28.8 trillion kilowatt-hours in 2025 to 30.7 trillion kilowatt-hours in 2027, driven by incremental demand from electric vehicles, air conditioning, and data centers. The inelastic growth in power demand has systematically raised the sensitivity of electricity prices to fuel costs, and the volatility range of energy spot prices has been amplified—which means that the medium-to-long-term cost curves for raw material industries such as aluminum, silicon, and chemicals, which heavily rely on electricity, will be repriced. Market Structure: Spot Mechanism Amplifies Price Signals The price discovery mechanism in the Japanese power market has amplified this fuel shock. The day-ahead and spot prices of the Japan Electric Power Exchange (JEPX) reflect marginal supply and demand changes in real-time, and fuel cost fluctuations are quickly incorporated into electricity prices. Starting in February 2026, JEPX and the Tokyo Commodity Exchange (TOCOM) launched the "JJ-Link" futures-spot integrated trading service, which entered its second phase in August, linking futures positions with day-ahead market quotes. This market-driven price transmission has, on one hand, made upstream fuel costs more transparent, and on the other, provided hedging tools for power generators, power retailers, and energy consumers—in an era of high volatility in energy spot prices, hedging capability is becoming a core competency. From an Asian perspective, the rise in Japanese electricity prices is not an isolated case. The simultaneous strengthening of LNG spot prices is pushing up the marginal supply cost in markets with a high share of LNG power generation, such as South Korea and Taiwan; the rising cost of gas power generation is also reinforcing the price support logic of alternative power sources like coal and nuclear power to some extent. In the energy price chain, the substitution and linkage between gas, electricity, and coal are becoming unprecedentedly tight: when natural gas prices decline, they weaken the substitutive advantage of coal, but when gas prices surge, they can counter-support coal prices. This seesaw effect is an important clue in analyzing Asian energy spot prices. Outlook: Energy Spot Prices Enter a "Geopolitically Sensitive" Era Overall, the current rise in Japanese electricity prices is the result of a resonance among three factors: geopolitical risks, climate demand, and market structure. In the short term, although the temporary shipping routes in the Strait of Hormuz have somewhat alleviated transportation pressure, the security situation remains uncertain, making LNG prices prone to increases and difficult to decrease. The IEA's expectation that Japanese power generation prices will rise by about 40% year-on-year in the second half of the year is not an exaggeration. For participants in the raw material and energy markets, this case offers three insights: First, the volatility of energy spot prices is no longer just a supply and demand issue; it is a game of geopolitical pricing power, and the status of strait passage, insurance, and freight rate changes should be monitored daily. Second, for Asian economies with high LNG dependency, the linkage between electricity prices and gas prices will continue to strengthen, highlighting the value of long-term contracts and hedging. Third, the structural growth in power demand provides medium-to-long-term demand support for the power, fuel, and even grid equipment sectors, and the configuration logic of related cyclical commodities deserves a re-examination. As Asia gradually enters the tail end of the summer peak season and the autumn/winter stocking window, every fluctuation in the situation in the Strait of Hormuz can become a trigger for a new cycle of energy spot price movements. For industrial investors, closely monitoring the status of strait passage, LNG spot quotes, and the electricity price indices of major economies is essential to grasp the rhythm and control risks amidst the dual variables of geopolitics and climate.