Technical Analysis
More solar, less earnings: the PUN trap and the only structural way out
📅 May 2026
⏱ Reading time: 5 minutes
The Italian photovoltaic industry is growing, but revenues per kWh are declining. This is called cannibalization, and it’s not a prediction: it’s already in the market data. Anyone installing or distributing in 2026 without a storage strategy is working toward a planned decline in their business.
PVclick Strategy Team
Operational and commercial analysis for the Italian PV sector
What you will find in this article
- Why the PUN, in Italy, is structurally destined to compress during solar hours
- The Terna and Italia Solare numbers that measure the ongoing cannibalization
- What changes with the MACSE and why the first auction is the strongest signal in recent years
- The four structural moves to move the value from kWp to kWh when it is valid
The problem: the sun produces kWh, not euros anymore
The electricity pricing mechanism in Italy rewards those who produce when the system needs it, and penalizes those who produce when there is already too much. It’s the law of the Single National Price: during peak solar hours, supply rises, demand does not grow at the same rate, and the price drops. The more photovoltaic systems are installed, the more this phenomenon amplifies. It’s cannibalization and it affects all of Europe, but in Italy it has a peculiar dynamic.
The GME, unlike other European operators, applies a zero floor for price formation: negative prices, formally, do not form. But On May 1, 2026, the PUN dropped to zero for about six hours: this is the first visible sign of a process that, without structural intervention, is destined to repeat itself and expand. For wholesale energy sellers, this is the first alarm bell. For those installing systems without storage, it’s a snapshot of the problem that end customers will experience in a few years.
The numbers that measure the trap
The Terna Monthly Report has published data that explains why the problem is not theoretical. In March 2026, Italian photovoltaic plants generated over 4,000 GWh, 17.1% more than in 2025: photovoltaics became the leading electricity source of the month. In the first quarter of 2026, renewables covered 36.2% of consumption.
The Osservatorio Italia Solare has photographed the park as of December 31, 2025: 43,513 MW cumulative, over 2 million connected systems, but with a figure that deserves attention, the new installed capacity in 2025 (6,437 MW) fell by 5% compared to 2024, with residential at -32% and C&I at -26%. Only the utility-scale segment grew (+15%). The market’s message is clear: installed capacity continues to rise, but its profile is changing, and the expected revenues for each new kWp installed are decreasing.
📊 The data that counts
As of December 31, 2025, Italy has 884,387 electrochemical storage systems, totaling 17.9 GWh and 7.3 GW of power. Storage is already at a third of installed PV capacity. Those selling a system without a battery are selling an asset that will progressively decrease in yield, while those selling integrated PV+BESS systems are positioning the customer on the right side of the curve.
The three forces pushing the PUN down
1. Structural overproduction during solar hours
When a market area has too many MW of photovoltaic capacity for the demand in that time slot, the price collapses. The technical response is called curtailment (production cuts) and has already become routine in some areas. Every kWh cut is lost revenue, and the situation worsens with each new utility-scale plant commissioned without coupled storage.
2. GME floor at zero
The Italian system prevents the formation of negative prices in spot markets, but this does not mean the problem is solved: it simply means that producers suffer a PUN compressed to zero instead of paying to inject. Several analysts have long been calling for alignment with European practice, because the zero floor distorts investment and penalizes industrial demand. The revision of the mechanism is the subject of regulatory discussion: those investing in 2026 must prepare their economic plan considering both scenarios.
3. Asynchrony between PV production and electricity demand
Peak solar production occurs at 12-2 PM, peak consumption at 7-9 PM. Shifting kWh from peak hours to peak hours is precisely the job of storage systems. Without BESS, photovoltaic systems produce energy that the system doesn’t require, and should produce more during times when they can’t. This is an asymmetry that the market is starting to price, and which MACSE has transformed into a structural revenue opportunity.
MACSE: the first market where storage becomes cash
The Forward Storage Market (MACSE) managed by Terna is the mechanism with which the Italian system remunerates the availability of centralized storage for 15 years. The first MACSE auction, concluded on 30 September 2025, awarded the 10 GWh of capacity offered at the starting price, with a weighted average price of €12,959/MW/year, compared to a maximum premium set by ARERA at €37,000/MW/year. The data by area is equally clear: €14,566/MW/year in Central and Southern Italy, €12,146 in the South, €15,846 in Sicily, €15,029 in Sardinia.
What this means in concrete terms: for those who own or manage storage capacity, MACSE is a multi-year revenue stream, independent of hourly arbitrage on the spot market. ARERA, with Resolution 362/25, has already drawn up the regulatory framework. Subsequent auctions have been scheduled: href=”https://www.pv-magazine.it/2026/03/27/arera-da-il-via-libera-alla-proposta-di-terna-verso-16-gwh-per-lasta-macse-per-il-2029/”>the auction towards 2029 aims for 16 GWh to be awarded. For installers and EPCs working on a utility-scale scale, it is the second revenue stream to be introduced into sales plans for C&I and developer customers.
The four structural moves to move to the right side
1. Sell kWh when they are worth it, not kWp
The metric by which an installer sells must stop being “how many kWp do I put on the roof” and become “how many euros does the customer bring home in 25 years of operation.” The difference isn’t cosmetic: a 100 kWp system without storage in the Southern Market area, at current PUN trends, has a revenue profile that compresses year after year. The same 100 kWp system with a BESS sized for evening self-consumption and ancillary services has a revenue profile that stabilizes, because it is decoupled from the PUN of solar hours.
2. Couple BESS from the design stage, not after the fact
Adding storage to an existing system is technically possible, but economically suboptimal: the grid section is undersized, the inverter needs to be replaced or duplicated, and construction costs are doubled. The right time to install a BESS is in the design phase, with a storage system sized for the expected load profile and a hybrid inverter. A three-phase SUN2000-MB0 hybrid three-phase inverter from 12 to 25 kW is the benchmark for medium-sized commercial systems, because it combines PV management, storage, and grid services in a single device.
3. Add a predictive EMS
The energy management system (EMS) is the brain that decides when to charge the battery, when to discharge it for self-consumption, and when, if the site is enabled, to participate in ancillary markets. Without an EMS, the BESS operates in reactive mode and leaves a significant portion of revenue on the table. With an EMS that integrates weather forecasting, PUN price forecasting, and load forecasting, the BESS becomes an active asset that reacts to the market. This is precisely why pv magazine, in October 2025, headlined that every PV system in Italy will require a BESS. The point isn’t technical, it’s economic.
4. Position yourself on MACSE for utility-scale projects
For installers and EPCs working on large-scale projects, MACSE is the most stable revenue channel ever introduced in the Italian storage market: a 15-year guaranteed rate for storage availability. However, you must participate in the auctions with projects that have already been completed prior to the authorization process, because MACSE qualification requires meeting technical and location requirements before participation. Those who prepare projects now position themselves for future auctions: those who react after the auction have already lost that round.
Why the storage supply chain is the real bottleneck
The discussion about PUN, MACSE, and EMS remains theoretical if the battery, BMS, hybrid inverter, and containment structures don’t arrive on site within the scheduled timeframe. The European storage market is growing at double-digit annual rates, and pressure on the supply chain of Chinese Tier 1 manufacturers is set to increase further. Translated into operational language: those who reserve volumes and lock in prices upstream win twice: on supply and on margins.
Direct imports from Tier 1 manufacturers with an Italian team managing contracts, logistics, and customs is how PVclick works with installers and EPCs looking to shorten the supply chain. It means speaking directly with the factory, knowing the actual availability of the batches, locking in the modules and batteries on the right batch, and avoiding the cascading markups of traditional distribution. For those structuring their 2026-2028 price list around integrated PV+BESS solutions, it’s the difference between making solid margins and chasing prices on the Italian spot market.
The three actions to close immediately
- Reconfigure the price list by shifting the commercial center of gravity from kWp-only PV to integrated PV+BESS solutions, with sales metrics based on 25-year revenues and not on initial CAPEX
- Block the storage supply chain with volume and price agreements with Tier 1 producers, avoiding exposure to escalations in the European market
- Equip yourself on the MACSE for utility-scale projects, anticipating auctions with projects that have already been qualified
Are you about to design a C&I or utility-scale plant?
Graph of the PUN hourly curve for May 1, 2026, versus the monthly average for April 2026, highlighting the hours at PUN=0 and indicating the cannibalization mechanism.
