No other type of business suits photovoltaics as well as a refrigeration operation: the cooling system needs the most electricity exactly when the sun shines the strongest – in summer, around midday, at high outdoor temperatures. Cold stores, fruit and vegetable stores, beverage warehouses or food logistics operations reach, from experience, 60 to 80 percent self-consumption, without a battery and without any control system. As a guideline, a fully installed system costs around CHF 1,100–1,400 per kWp from 100 kWp upward; the federal one-off feed-in incentive covers an order of magnitude of CHF 30,000 at this size. A battery isn't worthwhile here for self-consumption, but it is as a safeguard for the cold chain. (As of: September 2026)
Key points in brief
- Cooling load and solar yield run in sync: the hotter and sunnier it is, the more electricity the compressor needs – and the more the roof delivers.
- 60 to 80 percent self-consumption without a battery is the rule for refrigeration businesses, not the exception.
- Guideline values: 50 kWp around CHF 1,500 per kWp or below, 100 kWp CHF 1,100–1,400 per kWp, fully installed and before incentives.
- Sizing: summer midday production should cover the cooling load, not exceed it – anything above that goes into the grid at around 4 to 6 centimes.
- Backup power for the cold chain is plannable, but must be designed in from the start – retrofitting is expensive.
Why is refrigeration the best partner for solar power?
Every refrigeration system works against the outdoor temperature. The warmer it is outside, the more heat penetrates the cold room, the more often the compressor runs – and the worse its efficiency becomes at the same time, because the condenser has to release heat into hot air. The result is a load profile that follows the sun's course: a peak in July and August, a peak between eleven and three o'clock, a trough at night and in winter.
That's exactly the profile a solar system delivers. In a residential home, self-consumption has to be laboriously created, with a battery, heat-pump control and an EV during the day. In a refrigeration business, it's simply there. The ranges we see at businesses with refrigeration lie between 60 and 80 percent self-consumption – without a battery, without any intervention in operations.
The second part of the calculation is the price difference. Every kilowatt-hour you consume yourself replaces purchases at the business's tariff; every one fed in brings at least 6.0 Rp./kWh for systems under 30 kW, 6.2 Rp./kWh for 30 to 150 kW without self-consumption, and from 150 kW only the reference market price, which in the second quarter of 2026 was around 3.90 Rp./kWh. A refrigeration business that self-consumes 70 percent thus has the calculation single-family-home owners wish for. The basics for all commercial businesses are in the guide for business and SMEs.
Which businesses does this apply to?
For everyone where refrigeration dominates electricity consumption – and there are more of those than you'd think:
| Type of farm | Cooling profile | Solar suitability |
|---|---|---|
| Fruit store, CA store | Storage in autumn while irradiation is still high, continuous cooling until early summer | very good – the cool-down phase after harvest falls in sunny months |
| Vegetable store, potato store | Cooling from summer to spring, ventilation during the day | very good |
| Frozen goods warehouse, food logistics | Continuous load around the clock, summer peak | good – high base load, the system covers the summer peak |
| Beverage trading, brewery, cider mill | Cooling plus production during the day | very good |
| Butcher's shop, cheese dairy, dairy | Cold rooms plus process heat | good – check combination with heat recovery |
| Dairy farm with milk cooling | two cooling peaks after milking, summer load | good – details in the agriculture guide |
| Catering, large kitchen, pharmacy | Cold rooms, refrigerated display cases, air conditioning | good, usually smaller systems |
Experience-based values, as of: September 2026. The business's load profile (the grid operator's 15-minute readings) is decisive.
It looks different when cooling makes up only a small part of consumption, or the warehouse stands empty in summer – then the normal commercial calculation applies, and at very low consumption, full feed-in with HEIV can even be the better route.
How big should the system be – and what does it cost?
The rule of thumb for refrigeration businesses: the system is sized so that its production around midday on a sunny summer day covers the cooling load but doesn't far exceed it. Every kilowatt-hour above that goes into the grid at around 4 to 6 centimes – and from 150 kW of system capacity, only at the market price. Bigger is therefore not automatically better; the right size is in the load profile, not on the roof.
| System size | Guideline price per kWp (fully installed, without battery) | Order of magnitude of investment | Typical business |
|---|---|---|---|
| ~50 kWp | around CHF 1,500 and below | CHF 65,000–75,000 | Farm cold store, butcher's shop, beverage trading |
| ~100 kWp | CHF 1,100–1,400 | CHF 110,000–140,000 | Fruit or vegetable store, cold store |
| ~200 kWp | project-specific, further economies of scale | – | Frozen goods warehouse, food logistics |
Guideline prices based on published Swiss market data, as of: July 2026, fully installed, before incentives and before taxes. The individual quote after the potential analysis is binding.
The federal one-off feed-in incentive is currently around CHF 360 per kWp up to 30 kWp and around CHF 300 per kWp for the part above that, plus a base contribution (as of: August 2026) – for 100 kWp, an order of magnitude of CHF 30,000. From 100 kW, the application can be submitted before construction; from 150 kW, the route via PV auctions is open. Pronovo's current provisions are decisive.
A sample calculation, non-binding
A fruit store in eastern Switzerland purchases 150,000 kWh a year, around two-thirds of it for the refrigeration system. The hall's flat roof fits 100 kWp, which on the Swiss Plateau delivers roughly 1,000 to 1,100 kWh per kWp – about 100,000 kWh. At 70 percent self-consumption, 70,000 kWh stays in the business and, at a purchase price of 20 Rp./kWh, replaces electricity worth an order of magnitude of CHF 14,000 a year; the 30,000 kWh fed in bring, at around 4 to 6 Rp./kWh, another CHF 1,200 to 1,800. After deducting the one-off feed-in incentive of around CHF 30,000, the investment is in the order of CHF 80,000 to 110,000. Depending on the purchase price, load profile and electricity price developments, the payback period for refrigeration businesses is typically in the range of six to nine years.
Sample calculation with guideline values, as of: September 2026. The calculation based on the load profile and the individual quote is binding.
Battery, backup power, load peaks: what the cold chain additionally needs
For self-consumption, a refrigeration business doesn't need a battery – the load profile already fits. Three other reasons can still speak in its favour.
Backup power. A grid outage of just a few hours is an insurance case for a frozen-goods warehouse, and a risk to the whole harvest for a fruit store with a controlled atmosphere. A solar system alone doesn't help in an outage – it switches off for safety reasons, as the article on battery storage with backup power explains. Anyone wanting to safeguard the cold chain needs an emergency-power-capable system with its own wiring that can handle the compressors' start-up currents and recharges from the solar system in island mode. That's plannable, but has to be designed in from the start; for long outages, a backup generator remains the more robust solution, and the two can be combined.
Load peaks. Compressors starting up at the same time create brief power peaks, and many grid operators bill commercial customers a demand tariff based on the highest 15-minute reading. A battery that shaves these peaks can pay for itself via the demand tariff – the commercial battery guide works out when that adds up.
Load shifting. Cold rooms are thermal storage: lowering the setpoint temperature by one degree around midday and releasing it again in the evening shifts cooling work into the solar hours, with no battery. That's a setting on the cooling controller, not an investment – and, for businesses with a solar system, the first lever to pull before talking about a battery.
For all three points, what applies to every commercial roof applies here too: structural load-bearing capacity and the condition of the roof skin are checked before the quote – the regulations for flat-roof systems summarise what applies here – and from around 30 kW, the connection request to the grid operator runs, which for remote warehouse buildings with a long supply line is the very first question.
Where most refrigeration businesses in the region are located
The refrigeration businesses in our service area are located where fruit and vegetables grow: in the Thurgau fruit-growing region between Lake Constance and the Thur, in the St. Gallen Rhine Valley, in the Zurich Unterland and Weinland, and in the Aargau Seetal and Freiamt. The federal government's public installation register shows that these regions are already well advanced in solar build-out – and how much room remains:
| Canton | Systems | Watts per capita | Rank (26 cantons) | Ø system (kWp) |
|---|---|---|---|---|
| Thurgau | 16’931 | 1’674 | 3 | 29,9 |
| St. Gallen | 26’329 | 1’360 | 7 | 28,1 |
| Aargau | 25’869 | 1’019 | 12 | 29,3 |
| Schaffhausen | 3’344 | 966 | 16 | 26,0 |
| Zurich | 32’829 | 566 | 24 | 28,1 |
| Switzerland | 331’271 | 946 | – | 26,1 |
Our own analysis of the SFOE register «Elektrizitätsproduktionsanlagen», data as of August 2026, population from FSO 2025. All 26 cantons: Photovoltaics Switzerland in numbers.
Thurgau, the country's most important fruit-growing canton, ranks 3rd per capita – the farm buildings and warehouses of these businesses make up a large share of the installed base there. The Canton of Zurich, by contrast, ranks only 24th despite the second-highest total capacity per capita: anyone running a vegetable store in the Unterland or Weinland is, in most cases, still facing the decision.
For enquiries from businesses with refrigeration, the trigger is almost always last summer's electricity bill – and the first question is whether the roof can even cover the consumption. Usually the answer is both sobering and reassuring: the roof rarely covers the whole annual consumption, but it does cover the expensive part – the summer peak during the day. What we tell every business: first get the load profile from the grid operator, then size the system to it; and the question of backup power for the cold chain belongs in the first planning round, not the last.
Frequently asked questions
How much of my refrigeration electricity can a solar system cover?
Calculated over the year, typically 30 to 50 percent of total consumption, significantly more in summer. What matters is the other angle: 60 to 80 percent of the solar power produced typically stays in the business, because cooling load and yield coincide in time. Your grid operator's load profile gives the exact figure.
Do I need a battery storage system for a cold store?
Not for self-consumption – a refrigeration business's load profile fits the solar system without a battery. A battery becomes worthwhile as backup-power protection for the cold chain or to shave power peaks if the grid operator bills a demand tariff. Both must be planned in from the start.
Does the cooling keep running on the solar system during a power outage?
Not on its own. A normal solar system switches off during a grid outage for safety reasons. Only an emergency-power-capable system with a battery, its own wiring and sufficient power for the compressors' start-up currents keeps cooling running in island mode. For long outages, a backup generator remains the more robust solution; the two can be combined.
What does a solar system for a 100 kWp fruit store cost?
As a guideline, CHF 1,100–1,400 per kWp, fully installed, so an order of magnitude of CHF 110,000 to 140,000 before incentives (as of: July 2026). The federal one-off feed-in incentive covers around CHF 30,000 of that. Depending on the hall, there's also scaffolding, structural proof and adjustments to the main distribution board. The individual quote is binding.
Is the system still worth it if the warehouse is full in winter and empty in summer?
Then the calculation shifts: the cooling load falls in months with little sun, and self-consumption drops toward the values of a normal commercial business. It usually still comes out positive, because storage and cool-down in autumn still fall in sunny weeks – but the system is sized smaller. At very low summer consumption, full feed-in with HEIV should be examined.
Can I use the waste heat from the refrigeration system?
Yes, the heat released by the condenser can be recovered for hot water or space heating – standard practice in butcher's shops and dairies. That's a question of refrigeration technology, not the solar system; we coordinate it with the refrigeration planner. How heat pumps, conversely, serve for cooling is described in the article on cooling with a heat pump.
Free initial consultation
Last summer's electricity bill is the starting point.
Send us your annual statement and roof dimensions for your refrigeration business – we work out system size, self-consumption, incentives and the backup-power question as an indicative quote. A direct specialist company from Zurich with its own ESTI installation authorisation, no intermediary.
Prefer to talk? +41 78 830 83 35
Photovoltaic specialist for commerce and industry in the Zurich area →
Swissolar-certified specialist company · ESTI installation authorisation (Art. 14 NIV) · in Zurich since 2017 · over 150 systems completed · a personal answer from the specialist company, no call centre
Sources: cost guideline values according to published Swiss market data (as of July 2026); one-off feed-in incentive according to EnFV Annex 2.1 / Pronovo (as of August 2026); minimum remuneration and reference market price according to SFOE (Art. 15 EnFV, Q2 2026); SFOE register «Elektrizitätsproduktionsanlagen» (data as of August 2026, own analysis), FSO permanent resident population 2025; ecoEn GmbH's experience from commercial and farm projects. As of September 2026.
Last updated: 9 July 2026 · Author: ecoEn editorial team
