Investing in battery storage: the options at a glance

Grid-scale battery storage is the bottleneck of the energy transition: solar and wind power arrive irregularly, the grid needs something to absorb the swings, and that is exactly what storage does. From an investor's point of view it has become, within a few years, an infrastructure asset class in its own right. The obvious question follows: how does a private individual actually get in? The short answer: via four very different routes (shares and ETFs, funds, crowdinvesting and the entrepreneurial direct investment). They differ not only in the minimum outlay, but fundamentally in what you are actually invested in.

Why battery storage at all?

Before the how, a word on the why. With every added gigawatt of solar and wind, the gap between generation and consumption widens: too much at midday, too little in the evening. Battery storage buys power when it is cheap (or negative) and sells it when it is expensive; on top of that it earns from stabilising the grid. These several revenue sources at once make the business model more robust than that of a pure solar or wind plant. For investors that means a real, used asset with ongoing revenues, which is exactly why the interest is growing. Where those revenues come from and how high the return realistically turns out is explored in Battery storage returns: where the revenue comes from, and what is realistic; how big the German market has become and which time windows shape it is set out in Germany's battery storage market: the numbers, the drivers, and why "now" has a date. Here the focus is first on the routes in, which at their core also apply to related energy real assets such as Investing in agrivoltaics: dual land use, revenues and tax leverage at a glance. How such energy assets fit into the wider family of real assets (property, gold, equities) and what they deliver for inflation protection is shown in Real assets as inflation protection: what actually protects and where energy assets fit in.

What options are there to invest in battery storage?

There are essentially four routes. The first two give you shares in companies or in a broadly diversified fund; the last two invest you in concrete storage projects in Germany. The overview:

1. Shares & ETFs: a stake in companies

The simplest way in is via the stock exchange. You buy shares in battery manufacturers and technology groups, or a battery ETF that tracks the whole value chain, from lithium mines through cell makers to storage providers. Upsides: possible from just a few euros, tradable every market day, easy to diversify. The catch: you are investing in companies in the sector, not in a German storage system and its revenues. Prices hang on the world market, are volatile (many battery shares have lost heavily in recent years) and there is no real-asset tax lever. A route for investors who want liquid, small-ticket exposure to the theme. How a broad ETF portfolio and a direct investment differ on tax, liquidity and risk is set out in detail in Solar or ETF? Real asset and portfolio in an honest comparison.

2. Funds: pooled across many projects

Special funds and, increasingly, retail funds pool the capital of many investors and invest in a portfolio of grid-scale storage or infrastructure projects. The management handles selection and operation; you participate via units. Upsides: diversification across several projects and professional stewardship. Downsides: long terms, limited availability, several fee layers and usually no direct §7g effect, because you are not yourself entrepreneurially invested in the individual asset. The segment is young; the first grid-scale battery funds are just being launched. How such a fund wrapper differs structurally from a direct investment (on tax lever, costs and regulation) is explored in Direct investment or closed-end fund? The structural comparison.

3. Crowdinvesting & subordinated loans: small entry, subordinated risk

Via crowdinvesting platforms many investors jointly back a concrete project, usually through subordinated loans, from just a few thousand euros. Attractive interest rates are often advertised. The decisive word is 'subordinated': in a crisis, banks and senior creditors are served first and the crowd last; a higher rate is the compensation for exactly that risk. You receive a fixed return, but no stake in the asset, no say and no depreciation lever. A low-threshold route whose risk-return profile should be read carefully.

4. Direct investment: an entrepreneurial stake in the storage system

With a direct investment you take an entrepreneurial stake in a concrete grid-scale battery, in a tax-transparent structure that makes you, economically, a co-owner of the asset. That has two consequences no other route offers. First: you participate directly in the storage system's real revenues, not in a share price or a fixed rate. Second: because you are invested in the depreciable asset itself, the investment deduction (IAB) and special depreciation (Sonder-AfA) under §7g EStG apply, an immediate depreciation effect that markedly lowers the tax burden in the investment year. The price for it: a higher minimum outlay, no daily exit and the full entrepreneurial risk of the project. How such a grid-scale battery is built and works in the first place is explained in How does a grid-scale battery storage system work? Design, operation and revenue logic explained; what defines the asset technically (cell chemistry, lifespan, warranties) is covered in depth by The battery as a real asset: lifespan, degradation and warranties of a grid-scale storage system.

The real distinction: companies or the asset?

Reduced to the essentials, the four routes fall into two families. Shares and ETFs invest you in companies of the battery sector: global, liquid, volatile, with no link to a single asset. Funds, crowdinvesting and the direct investment invest you in the storage systems themselves: less liquid, but with a direct link to real projects and revenues. Within that second family, proximity to the asset rises from route to route: with a fund you hold a unit in the portfolio, with crowdinvesting a claim against the project, with a direct investment an entrepreneurial stake in the asset. With proximity grows the potential leverage, and the responsibility.

Which route suits whom?

• Small entry, full flexibility: shares & ETFs, from just a few euros, tradable any time, but with no link to a concrete storage system and no tax lever.
• Diversification with limited effort: funds, pooled across several projects, professionally managed, but fee-laden and tied up long term.
• Fixed return, low threshold: crowdinvesting, small outlay and a predictable rate, but subordinated risk and no real asset.
• High earners with a tax burden and a real-asset focus: direct investment, higher outlay and entrepreneurial risk, but a real asset, ongoing revenues and the §7g tax lever.

Where does the direct investment fit?

The direct investment is the most demanding but also the most substantial of the four routes, and the only one with a genuine tax lever. That is exactly why it is interesting for high earners with a heavy tax burden who want to build a real asset anyway. How the tax effect works in practice is shown in the worked example in IAB under §7g EStG: example calculation for battery storage; why the effective equity outlay often turns out smaller than expected is set out in How much equity is actually required?. And because so much on this route depends on the quality of the provider, it is worth a look at Transparent costs: which fees a direct investment involves, and which ones are hidden and the warning signals in How to tell a trustworthy provider of energy direct investments first. Anyone who wants to place the tax lever in the wider context of legal strategies will find it in Legally reducing your tax: the most effective strategies.

Which route suits you is, in the end, a question of outlay, time horizon and tax situation. In a non-binding first call we map out the options, and, if it fits, work the direct investment through on your concrete numbers.