Return calculator, battery storage share
Revenue, costs, depreciation and tax across fifteen years – on the Bright & Green model.
Model calculation – not tax or investment advice
This calculator provides a non-binding, simplified model calculation based on your inputs and documented assumptions. The results do not constitute tax, legal or investment advice and do not replace an individual review by your tax adviser. No warranty is given for accuracy or returns.
In three steps, what a share in a battery storage plant returns over fifteen years.
- 01
Set out your share
The number of modules, the net purchase price, and the revenue per kilowatt per year the plant earns on the market.
- 02
Tax and financing
Your tax rate for the first three years and for the years after, the assumed inflation and, if you want one, a share financed by debt.
- 03
Read off the return
The calculator sets revenue, operating costs, depreciation and tax against one another year by year and reports three yields.
It runs the model Bright & Green uses to price a share in a storage plant.
One module has 52.24 kilowatts of power and twice that in kilowatt hours of capacity. Its revenue is held flat across the term. Nine cost lines come off it: transformer rent, insurance, technical and commercial operations, ground lease, trader fees, tax advice, provision and deposit, and anything else. Insurance and technical operations rise with inflation, trader fees and commercial operations follow revenue, the rest stay where they are.
On the tax side the model rests on the German investment deduction under §7g EStG: half the purchase price reduces taxable profit in the year before the plant is bought. What is left is written off through a Sonderabschreibung over a declining balance, up to the tenth year; after that nothing more is written off. The tax rate is lower in the first three years than in the years that follow.
Three figures come out at the end, each an annual average across fifteen years: the project return before tax and financing, the return on the equity employed, and the net return after tax, interest and repayment. The table below shows every single year, so it stays clear where the three figures come from.
A model calculation on Bright & Green's assumptions, without commitment — neither tax advice nor investment advice. The tax treatment of your own case is a matter for your tax adviser.
Behind the arithmetic is a plant we develop, build and operate ourselves.
One company, whole plant
Development, construction and operations are ours. The share you take is in a plant we answer for.
Delivery you can plan around
Built in three to six months as a rule, so the purchase can be booked reliably in the year it was planned for.
An experienced partner
Almost 20 years of experience and more than 1,500 installations delivered give you certainty on the decision and the timetable.
Operated for the whole term
Operations, marketing and maintenance carry on for the whole term. Their cost is already in this calculation.