Hamburg, 26 August 2026 – Power trader FlexPower is now supplying data centres with renewable electricity from its own wind and solar portfolio. Instead of a standardised full-supply contract, operators put together their own procurement mix: multi-year fixed prices, flexible sourcing on the short-term power market and physical or virtual battery storage, matched to their risk profile and growth plans.
For data centres, electricity is by far the largest ongoing cost item: according to the German Datacenter Association it accounts for up to half of the operating costs and consumption keeps growing as AI and cloud applications expand. At the same time, the German Energy Efficiency Act (EnEfG) already obliges operators to cover at least half of their electricity consumption from renewable energy on a net accounting basis; from 2027 that share rises to 100 percent. Anyone planning or operating a data centre today therefore needs both: reliable electricity prices over many years and demonstrably green supply.
FlexPower solves this with a modular approach: part of the consumption is fixed in price for several years through power purchase agreements (PPAs) and fixed-price tranches. The remainder is sourced flexibly on the short-term power market, where favourable price windows can be used. A battery hedges against price spikes, either physically on site or as a virtual battery: a trading product that replicates the dispatch pattern of a battery, buying electricity in the cheapest hour of any 24-hour period and selling it in the most expensive one, hedging against price volatility. The guarantees of origin come directly from FlexPower's own direct marketing portfolio, not from purchased certificates. How these building blocks are weighted is the operator's decision. There is no standard package, only a structure that fits the financing model.
A dedicated physical battery on site can do more than hedge: it shifts part of the consumption into cheaper time windows, shaves peak loads and thereby reduces grid fees. FlexPower markets the battery’s unused capacity on the spot markets, turning it into an additional revenue stream. At sites with a limited or delayed grid connection, a battery can likewise buffer peak loads and thus enable more computing capacity behind the same connection point, an increasingly decisive factor in site development.
Looking ahead, FlexPower is working with partners from the data centre ecosystem to include the computing load itself in the optimisation: time-shiftable workloads respond to price signals, relieve the grids and are increasingly being rewarded financially for doing so. Computing capacity then follows the electricity, not the other way round.
“Data centres are planned and financed over decades. For operators and their banks, what counts is therefore not only the electricity price, but also whether the supplier can honour its commitments over the entire term. As part of the Citadel group, we can back long-term price and structuring commitments with the necessary financial strength. That is what makes projects bankable,” says Max Amir Dieringer, CEO of FlexPower.
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For more information, please contact:
Citadel FlexPower GmbH | Jasmina Utzat | Communications | jutzat@flex-power.energy