The load that follows the sun
Most businesses have a problem with solar: the power arrives at noon, the need arrives at night. A cold store is the exception. The hotter and brighter the afternoon, the harder your compressors work — and the more your roof generates. Load and generation rise together, hour by hour.
That matters because electricity is 25–35% of a typical cold store's running costs. It is the single biggest controllable line in the business, and most of it is spent fighting the afternoon sun. Putting that same sun to work is not a green gesture. It's the obvious commercial move.
The design that works
- Solar sized to the cooling peak. Self-consumption first: the panels feed the compressors directly through the day. Zero-export by default — exported power earns half (or less) of what imported power costs.
- Bank cold, not just electrons. Run the plant harder at midday and store the surplus as ice or phase-change cold. Overnight, the store draws on banked cold instead of full-price grid power. Storing cold costs a fraction of storing the same energy in lithium.
- Fix the plant while you're at it. If the system runs R404A, a CO₂ refrigeration upgrade cuts the leak bill, the electric-defrost waste and the energy draw at once — a typical mid-size facility loses around ₱4.1 million a year to those three leaks alone. The full breakdown is here.
- Free heat on the side. CO₂ refrigeration rejects heat at up to 75 °C — hot enough for wash-down water. Heat you currently pay to make twice.
Honestly stated: the combination — solar self-consumption, thermal storage, and a modern refrigeration plant — typically brings the total bill down 50–65%, with refrigeration upgrade paybacks under two years. Your exact number depends on your rooms, your product and your roof, which is why we measure first.
The 2026 headroom
The new net-metering rules (circular DC2026-01-00012, April 2026) raised the commercial cap from 100 kW to 1 MW with 10-working-day decisions — useful if you want grid-tied flexibility. But for a cold store the better economics rarely involve exporting anything: every kilowatt-hour your roof makes has a paying job on site.
Who we are
Karnot Energy Solutions Inc. is a Philippine energy company in Mapandan, Pangasinan. We design and install natural-refrigerant refrigeration, heat pumps, thermal storage and solar + storage systems for cold chain and food businesses across the Philippines, the UK, the US and Canada.
Questions we get asked
Is solar worth it for a cold storage facility?
Cold stores are one of the best solar matches in the country. Electricity is 25–35% of running costs, and the hardest cooling hours — hot afternoons — are exactly when panels generate most.
What happens at night without the sun?
Bank cold at midday in an ice or phase-change store and draw on it overnight, with a right-sized battery for controls and peak shaving. Storing cold is far cheaper than storing electrons.
Does this work with my existing refrigeration plant?
Often, yes. But if you run R404A, pairing the solar work with a CO₂ upgrade usually pays better — it cuts leaks, defrost waste and energy draw at the same time.
How much can a cold store save overall?
A typical mid-size facility loses around ₱4.1 million a year to defrost heaters, refrigerant top-ups and non-condensable gases before solar even enters the picture. Fixing those plus solar self-consumption typically brings the total bill down 50–65%.
Get the numbers for your facility
One free site survey: we measure the rooms, the plant and the roof, and show you the honest figures. No upfront cost options — you pay monthly, less than your bill today.
Book a free site surveyRelated: Cold chain applications · iCOOL CO₂ refrigeration · Commercial solar + storage · Where a cold store's money leaks