[Summary]
Japan's electricity market is changing from a market that simply increases the amount of electricity generated to one that values the "flexibility" of moving electricity when and where it is needed.
Due to the combination of renewable energy expansion, LNG prices, AI data centers, semiconductor factories, EVs, and power transmission and distribution constraints, the focus of investment has shifted from power generation facilities themselves to storage batteries, EMS, VPP, PCS, power transmission and distribution, and power trading.
This paper comprehensively organizes the systems, market structure, corporate strategy, technological innovation, geopolitics, financial marketization, and risks that should be observed in 2026.
Introduction
Japan's electricity market is quietly beginning to transform into a different industry.
Electricity was once a simple piece of infrastructure. Electric power companies generate electricity from large-scale thermal or nuclear power plants and provide a stable supply to consumers. For investors, electric power stocks were also strongly positioned as ``defensive assets.''
However, that premise is being shaken.
High crude oil prices, LNG prices, weak yen, rising interest rates, AI, data centers, semiconductor factories, decarbonization, expansion of renewable energy, and the spread of EVs. As a result of multiple major trends progressing simultaneously, the electricity market is now transforming into a market where the value is not ``supply amount'' but ``flexibility''.
Of particular importance is the demand for electricity in the age of AI.
Data centers and GPU clusters require large amounts of stable power 24 hours a day, 365 days a year. On the other hand, solar power and wind power are variable power sources and cannot always generate electricity when needed.
In other words, the current energy problem is
“How much power can we generate?”
rather than
“Can we move electricity stably when and where it is needed?”
It is changing to
This change changes the investment theme itself. The future winners will not simply be companies with power generation facilities.
electricity,
- Save
- move
- control
- Optimize
- Market
It is a company.
This paper analyzes the electricity market, renewable energy, and electricity storage investment as of 2026, including systems, market structure, corporate strategy, technological innovation, geopolitics, and financial markets.
Chapter 1: High crude oil prices increase “flexibility value” rather than “renewable energy tailwind”
Many investors, when they see rising oil prices, simply think that it is a tailwind for renewable energy.
But in reality, it's a little more complicated. What is more important in Japan's electricity market is the impact on LNG prices than the crude oil price itself.
According to the Agency for Natural Resources and Energy, Japan's LNG import prices basically tend to be linked to trends in crude oil prices. This is because Japan procures most of its LNG through long-term contracts, and the price of many of those long-term contracts is linked to the average CIF price of crude oil imported to Japan.
In other words, when crude oil prices rise, it tends to affect LNG prices and thermal power generation costs with a time lag. As a result,
*Wholesale electricity price
- Retail electricity bill
- Fuel cost adjustment unit price
upward pressure is applied to
What is important here is that the cost of solar power generation itself does not become cheaper due to high oil prices. The reason renewable energy has a relative advantage is because the marginal cost of thermal power increases.
The essence of the high oil situation is that
"Renewable energy will become cheaper"
rather than
"The marginal cost of thermal power will rise, making it easier for the electricity price gap to widen."
That's true.
And it's not just the power plants themselves that will benefit greatly from this structural change. These are storage batteries, EMS, VPP, and DR that can take advantage of price differences.
The more volatile electricity prices are, the more valuable flexible assets become. The favorites for rising oil prices are not only fuel companies, but also companies that can monetize the ``time lag in electricity''.
Chapter 2: The electricity market will shift from a “kWh market” to a “flexibility market”
Japan's electricity market used to be very simple.
Sell the electricity you generate.
That was it.
But things are different now. In the current electricity market,
- When to generate electricity
- Where to generate electricity
- What time is the demand?
- How much can you adjust?
has become more important.
A symbol of this is the fluctuation in JEPX prices. Japan Exchange Group also notes that electricity prices are greatly affected by weather, power plant operation, and supply and demand, and that there is a growing need to hedge against price fluctuation risk.
As a result of the introduction of large amounts of solar power, it is easy to have excess electricity during the day. On the other hand, surplus supply capacity changes rapidly from evening onwards. In other words, even the same 1kWh has completely different value depending on the time of day.
This is where "flexibility value" comes into being.
In the current Japanese market, the following markets and systems are important.
| Area | Main meaning |
|---|---|
| JEPX | kWh value through wholesale electricity price |
| Capacity Market | The Value of Securing Future Capacity |
| Supply and demand adjustment market | Value of balancing frequency and supply and demand |
| Non-fossil value market | Environmental value of decarbonized power sources |
| FIP system | System that connects renewable energy to market prices |
All these are
“You can’t make money just by generating electricity.”
It means that.
For example, storage batteries
*Charge at cheaper times
- Discharge at high time
This will recover the price difference. Furthermore, there is the potential to accumulate revenue from multiple markets such as capacity market, frequency adjustment, output control avoidance, and DR.
In other words, current storage batteries are not just equipment. The electricity market itself is becoming a trading financial asset.
Chapter 3: Solar power shifts from “power generation competition” to “location competition”
In the FIT era, solar investing was very simple. Sell electricity at a high fixed price. This alone was enough to make a profit.
But those days are coming to an end.
From 2026 onwards, it is not just the amount of electricity that is important.
“Where to generate electricity?”
It is.
Renewable energy output control has already become an issue of market structure with regional differences, rather than being a special case of a specific region. Data from the Agency for Natural Resources and Energy also shows high output control rates in some areas such as Kyushu as expected in 2025.
In other words, from now on,
- Grid congestion
- Output control *Regional demand
- Interconnection line constraints
- Future node price ideas
determines investment returns.
What becomes strong here is
- Rooftop solar
- Self-consumption type
- Corporate PPA
- Close to data center
It is.
The reason is clear. This is because the generated electricity can be used on the spot. It is less susceptible to power transmission constraints and does not rely solely on wholesale market prices for revenue.
In the future solar market,
"How much power will you generate?"
From
"Who should use it directly?"
becomes important. This is a major structural change.
Chapter 4: Why storage batteries are the biggest theme
What will be the most important energy asset in the next 10 years?
A leading candidate is storage batteries.
The reason is simple. This is because the more renewable energy is used, the wider the "time lag" in electricity.
I have leftover lunch. There aren't enough nights. Spring and autumn are surplus. Summer and winter are tough.
Storage batteries fill this gap.
However, it is important to note that the value of storage batteries lies not only in the ``batteries'' themselves. What is really worth it is
- Control software *EMS
- AI optimization *PCS
- Market participation algorithm
- Operational know-how
"How long does the battery last?"
rather than
"How wisely can you operate it?"
becomes competitive.
The Agency for Natural Resources and Energy also believes that distributed energy resources such as storage batteries are increasingly being utilized in response to tight supply and demand and in the supply and demand adjustment market, and that opportunities for their use are expected to expand further in light of the FIP system.
Storage batteries are not just a capital investment. It is a "multi-use asset" that captures multiple markets at the same time, including price differences, capacity value, supply and demand adjustment, DR, and VPP.
Chapter 5: AI is both a “friend” and “enemy” of renewable energy
The AI boom has the potential to fundamentally change the electricity market.
GPU clusters and AI data centers consume huge amounts of power. Moreover, a stable supply is necessary.
A problem arises here.
Solar power does not produce electricity at night. Wind power also fluctuates. In other words, in the AI era,
“Renewable energy alone is not enough”
It is.
As a result, the world
- Gas-fired power
- Nuclear power *Storage battery
- Power transmission and distribution *Long time storage
is beginning to be reevaluated.
The IEA's "Electricity 2026" also summarizes that, against the backdrop of increasing demand for AI and data centers, power systems will need to be flexible to accommodate a variety of power sources and demand patterns.
However, on the other hand, AI can also become a renewable energy weapon. AI is
- Supply and demand forecast
- VPP optimization
- Storage battery operation *DR control
- Power trading
can be advanced.
In other words, AI
“Existence that increases electricity demand”
At the same time,
“Existence that advances the power system”
There is also. This is very important.
Chapter 6: EVs will become “running storage batteries”
The EV market is often talked about as an automobile market. However, at its core, it is also an energy market.
This is because EVs are huge storage batteries.
In V2H, EVs become household power sources. In V2G, EVs return power to the grid.
In other words, the boundaries between car companies, charging infrastructure companies, electricity retailers, and aggregators may become blurred in the future.
Commercial EVs are especially important. Logistics vehicles and buses have large capacity batteries and have relatively regular operating hours. This is suitable for power control.
From now on,
- EV
- Charging infrastructure *Storage battery *DR *VPP
are likely to become integrated.
The boundaries between mobility and energy are gradually disappearing.
Chapter 7: The final winner may be “power transmission and distribution”
Many investors are paying attention to renewable energy power generation.
However, what really matters is likely to be the network. The reason is simple.
This is because the more renewable energy there is, the further the electricity needs to be moved.
For example, Hokkaido has wind potential. However, the area of demand is Tokyo. Kyushu has a lot of sunlight. However, during the daytime, it tends to become surplus.
In other words, from now on,
- Power line *HVDC
- Transformer
- Smart grid
- Power distribution control
- Grid storage battery
value increases.
This is similar to the structure in which the value of lines and data centers increased in the Internet era. Even in the electricity market,
"Power generation equipment"
From
"Network"
may have ultimate control.
Chapter 8: Japan will no longer be a “national uniform market”
Regional differences will become extremely important in the future Japanese market.
In Kyushu, output control is common. In Hokkaido and Tohoku, the balance between renewable energy potential and power transmission capacity tends to be an issue. Demand is high in Tokyo. Demand for factories is strong in the Chubu region.
In other words, from now on,
"Same sunlight"
However, the value differs depending on the location.
This is similar to the real estate market. Location determines IRR.
The electricity market is gradually approaching a "nodal economy." Although a complete nodal pricing system is not common in Japan today, when making investment decisions, it is necessary to look at regional supply and demand, interconnection lines, output control, and customer location.
Your investment results will vary greatly depending on whether you have this perspective or not.
Chapter 9: Will nuclear power be reevaluated?
When discussing the renewable energy market, the issue of nuclear power cannot be avoided.
In the age of AI, semiconductors, and data centers, stable power is required 24 hours a day. It cannot be supplied by sunlight alone.
As a result, the world is beginning to reevaluate nuclear power.
This is
"Renewable energy vs. nuclear power"
Not.
Actually,
"Renewable energy + nuclear power + storage batteries + thermal power adjustment + power transmission and distribution"
This combination is becoming a reality.
The 7th Basic Energy Plan also sets out the expansion of carbon-free power sources, including renewable energy, as an important theme in anticipation of increased electricity demand.
The electricity market in the future is likely to be driven by a combination of "supply stability," "cost," "decarbonization," and "safety," rather than simple ideology.
Chapter 10: Dependence on China is a big risk
A major risk for the renewable energy market is its dependence on China.
Solar panels, battery cells, PCS components, rare metals. Many rely on supply chains in Asia, including China.
In other words,
- US-China conflict *Taiwan emergency
- Tariff
- Export regulations
- Human rights and forced labor regulations
- Containment of important minerals
If this happens, all renewable energy investment will be affected.
This is very important. While renewable energy is clean energy, it is also an industry with geopolitical risks.
From now on,
*Return to Japan
- Supply chain reconstruction
- Japan-US-Europe collaboration
- Recycle
- Alternative materials
is likely to become an investment theme.
Chapter 11: The electricity market becomes a “financial market”
The electricity market is no longer just an infrastructure market.
From now on,
- Electricity futures *REC
- Non-fossil certificate
- Carbon credits *Capacity value *Flexibility value
``Electricity value'' itself will become a financial product.
Storage batteries are particularly symbolic.
Earnings from storage batteries are not simply from selling electricity. Cross multiple markets and recover price differences.
In other words, BESS is
"Battery"
rather than
"Electric power trading equipment"
Close to.
In the future, the energy market will
physical infrastructure
electricity market
flexibility market
financial market
may evolve into.
Chapter 12: Winners and Losers
Which companies will be strong in the future?
What is important is not the amount of power generated but the control power.
Possible Winner
- Grid storage battery *EMS *VPP *PCS
- Power semiconductor
- Power transmission and distribution
- Electric wire
- Transformer *AI control
- PPA for data centers
These have the potential to capture electricity flexibility value directly.
On the other hand, it is easy to struggle with
- Simple power selling type mega solar *Subsidy dependent model
- Regional projects subject to grid constraints
- Specialized in equipment sales without control software
It is.
The higher the renewable energy ratio, the more likely daytime prices will fall. The more sunlight there is, the more likely it is that a ``self-destructive structure'' will occur, where solar income deteriorates.
This perspective is very important.
Chapter 13: Technological innovation changes the rules of the game
In the future energy market, technological innovation may change the market structure itself.
Perovskite solar cells are an important topic for Japan. Light and flexible, it can be installed on building walls or in urban areas.
Solid-state batteries and sodium-ion batteries have the potential to change battery costs and resource issues.
SiC/GaN power semiconductors improve EV, battery storage, data center, and PCS efficiency.
Furthermore, AI control and digital twins will transform the entire power system into software.
In other words, from now on,
"Electric power equipment"
rather than
"Power OS"
There is a possibility that companies that control the market will become stronger.
Chapter 14: The biggest risk is “self-destruction of renewable energy”
There are major contradictions in the renewable energy market.
The more renewable energy available, the lower the price of renewable energy will be.
This is a phenomenon that has been seen first in Europe and other countries, and in Japan too, daytime surpluses, output controls, and regional price differences make investment decisions difficult.
In other words,
“Even if the amount of power generation increases, there is no profit”
There is a possibility.
This is the self-destructive structure of renewable energy.
That's why from now on,
*Storage battery *DR *VPP
- Long-term flexibility
- Power transmission and distribution
- Consumer side control
value increases.
The market is
"Power generation"
From,
"Integration/Control"
is moving to.
KPIs that investors should look at
When looking at the electricity market as an investment theme, it is easy to make mistakes if you only follow stock price factors. What we need to look at is the system and physical constraints.
| Perspective | KPIs to watch |
|---|---|
| Price difference | JEPX price by time of day, day/night spread, volatility |
| System constraints | Output control rate, interconnection line utilization rate, connection volume by region |
| Storage batteries | Charge/discharge cycles, operating rates, diversification of revenue sources, deterioration rates |
| Demand | Data centers, semiconductor factories, EV charging, industrial electrification |
| System | Capacity market, supply and demand adjustment market, FIP, non-fossil certificate |
| Corporate strength | Control software, PCS, O&M, aggregation track record |
| Risks | Interest rates, subsidies, fire safety, procurement sources, regulatory changes |
In the end, what matters is not "how many MW you have."
What points can you use, what systems to use, in what markets, and in what time periods?
Final chapter: The era of power generation is over
The electricity market of the future will not be a simple competition for power generation.
The important thing is that
- When can power be generated?
- Where can I send it?
- How stable is the supply?
- How much control you have
It is.
In other words,
Era of power generation
era of flexibility
It is changing to
The future winners will not simply be companies that produce cheap electricity.
fluctuating power,
- Save
- move
- control
- Optimized
- Can be commercialized
It is a company.
Electricity markets are no longer just public utility infrastructure. It is becoming a huge next-generation industry where AI, semiconductors, data centers, EVs, GX, financial markets, and geopolitics intersect.
2026 may be remembered as that turning point.
Source
Japan's energy policy/renewable energy related
- Agency for Natural Resources and Energy “Understanding the Basic Energy Plan ③: Aiming for significant expansion of renewable energy” [Agency for Natural Resources and Energy: Renewable energy expansion policy] (https://www.enecho.meti.go.jp/about/special/johoteikyo/energykihonkeikaku2025_kaisetu03.html?utm_source=chatgpt.com)
- Agency for Natural Resources and Energy “Significance of VPP/DR” Agency for Natural Resources and Energy: Significance of VPP/DR
- Agency for Natural Resources and Energy “Measures for disseminating VPP/DR” [Agency for Natural Resources and Energy: VPP/DR dissemination measures] (https://www.enecho.meti.go.jp/category/saving_and_new/advanced_systems/vpp_dr/measure.html?utm_source=chatgpt.com)
- Agency for Natural Resources and Energy “Long-term outlook for renewable energy output control” Long-term outlook material for renewable energy output control (PDF)
- Agency for Natural Resources and Energy “Chapter 1 Section 3 Trends in primary energy” Agency for Natural Resources and Energy: Primary energy trends
Electricity market/Electricity futures
- Japan Exchange Group (JPX) “Electricity Futures Product Overview” JPX: Electricity Futures Product Overview
Overseas/International Organization Report
- International Energy Agency (IEA) "Electricity 2026" IEA: Electricity 2026
Confirmation date: 2026-05-09