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AKE: Arbeitskreis Energie

AKE 9: Energy Storage II

AKE 9.1: Hauptvortrag

Dienstag, 17. März 2015, 14:00–14:30, A 151

Power to Gas - an economic approach ? — •Manfred Waidhas — Siemens AG, PD LD HY, 91058 Erlangen, Germany

The reduction of CO2 emissions is clearly linked with the extension of renewable energies (RE). However, due to the volatile character of its power generation there will be an increasing mismatch between generation and demand. The storage of excess production will become essential in the future in order to prevent increasing curtailment of wind and PV installations and to enable an economic viable scenario with renewables.

It is very clear that grid extension and demand side management will come prior to energy storage. But the estimated storage demand in a 85 % RE scenario - as targeted for Germany in 2035 - will be in the TWh range.

There are many concepts and technologies to store electric energy. Among the three options for large- scale storage * pumped hydro, compressed air and hydrogen - hydrogen is the only viable option to address capacities >10 GWh. Enabling component is the electrolyzer technology, converting electrical energy into hydrogen, a multifunctional chemical energy carrier.

This concept - power to gas - has raised big resonance on one side, but contradictory discussions on the other hand. This presentation addresses all the disputed arguments. It will illustrate the technology, its pros and cons and its limitations. Stress will also be laid on the economic viability in the current and future power generation market.