Case Study: Cost-Effectiveness of a Commercial Warehouse
How the Energy-Rock commercial storage system reduces peak loads and significantly lowers your energy costs.
A retail company is already generating solar power at its own facility. Photovoltaic systems and a combined heat and power plant provide a significant portion of the energy. Old feed-in tariff contracts have now expired. This left an unresolved problem: some of the solar energy was fed back into the grid without being used, and the peak loads cost more than the electricity itself.
The Challenge
The facility consumes a lot of energy, but it also generates a significant amount of it itself. The problem was timing. When the sun was shining, energy wasn't always being consumed. When consumption peaked, the facility relied on expensive grid power. It was precisely these peaks that accounted for nearly half of the annual energy costs.
Stock photo, generated using AI. Our client’s name and location have been anonymized for confidentiality reasons.
From reliance on government subsidies to an independent cash cow. The success story of commercial energy storage systems
Our Solution
The Energy-Rock, with a storage capacity of about 260 kWh, acts as an intermediary between generation and consumption. It charges when energy is cheap. It discharges precisely when it would become expensive. The peak-shaving function cuts off the peaks before they show up on the bill.
A facility that generates solar energy becomes a system that delivers it whenever it’s needed.
Even in the first year of operation, the value added is in the high five-digit range. The investment pays for itself in about four years.
Stock photo, generated using AI. Our client’s name and location have been anonymized for confidentiality reasons.
Core Components and Functions
- Energy-Rock Outdoor Storage Unit, approximately 260 kWh usable capacity
- Peak shaving for targeted reduction of peak loads
- Integration into Existing PV and CHP Generation
- Business model with a payback period of about four years
- Can be financed through leasing; positive cash flow starting in year 1
Is a storage system worth it for your energy profile?
What matters isn’t the technology, but your energy profile: when your business consumes and generates electricity, and how much. Based on a few key metrics, we calculate whether an Energy-Rock commercial storage system will reduce your peak loads and determine when the solution will pay off for you.
The Numbers at a Glance
| Key figure | Value |
|---|---|
| Recommended System | Energy-Rock, approx. 260 kWh usable, approx. 125 kW |
| Total investment | approximately €70,000 |
| Savings in Year 1 | approximately 16,000–17,000 € |
| Projected Payback Period | approximately 4–4.5 years |
| IRR (Internal Rate of Return) | approximately 24% |
| NPV (Net Present Value) over 20 years | approximately €300,000–330,000 |
| Energy costs before and after | approx. €87,000 → approx. €70,000 |
When financed through a lease, there is an additional effect. The annual payment is less than the annual value added. The company So, from the very beginning, it earns more than it pays in lease payments. No upfront costs, no waiting for the investment to pay off. Positive cash flow begins on the first day.