Bachelor's thesis Denis Sepoetro

 

The Economic and Technical Feasibilty of Various Storage Technologies to Compensate the Volatile Electricity Generation Produced from Renewable Energy Sources

With the growing share of renewable energies in our power grids characterized by a strong fluctuation,
the challenge of matching electricity generation and consumption arises. Many solutions
have been proposed in the past including expanding the storage capacity in the power system and
deploying conventional power plants that can supply additional electricity during peak times. The
bachelor thesis at hand discusses both approaches by creating multiple scenarios in which the storage
costs of several technologies are benchmarked against each other and against the power generation
costs of a typical gas turbine. The observed technologies in this analysis are at least in an early
stage of commercialization and include centralized as well as decentralized storages with installation
costs for today and the year 2020. As of to date, pumped hydroelectric storages are one of the
few storage plant types installed in our power system. Nevertheless, there are many other technologies
being developed aiming to solve the mismatch of renewable energy generation and electricity
demand. Therefore, different large-scale batteries, compressed air energy storage and Power-to-
Gas technology are considered in this thesis to compare to local storages such as lithium-ion and
lead acid batteries as well as the conventional sensible heat storage in regard to their suitability to
cover the heating demand of a single-family house. Market environments are set by the scenarios
and feature electricity pricing schemes that include dynamically adjusted energy procurement
costs and different sets of levies, fees and taxes. Within these boundary conditions and the given
use case, the sole technical storage costs, storage costs incorporating energy losses and costs to be
paid by the end-consumer are calculated using the annuity method. Thereby, the profitability of
the observed systems is evaluated revealing the potential of emerging technologies to economically
compete with existing and well-established storages, such as hot water buffer tanks.