The idea was to intelligently integrate the electricity into the grid and a regional market, while simultaneously enabling a more active participation of small end-consumers into power markets of the region. One of the project’s central goals was to test an ICT-based electricity market system with regional products under realistic conditions that links together producers, commercial consumers with flexible loads and energy service providers. 100 substations in Cuxhaven were equipped with metering technology.
In simulations, the DSO also participated in the marketplace. Within the field-test infrastructure, new solutions to increase the security of supply at distribution level from renewable energy sources and the system’s economic efficiency were successfully developed and implemented. During the field trial, the marketplace’s embedment into the existing business processes of the superordinate energy supply system became one of the main challenges and was resolved by the consortium. For the field-test’s life cycle, all stakeholders participating in the marketplace were exposed to the same marketing- and price risks.
Two cold storages, a wind park and a photovoltaic plant were represented on the marketplace and marketed comprehensively within a Virtual power plant (VPP), together with a sewage plant, the city’s public swimming pool and an engine-based cogeneration-plant. The generation units managed by the Virtual Power Plant within eTelligence could be integrated individually or collectively and thereby became similarly controllable and predictable just like a conventional generation plant. Due to the integration of DER and the larger consumption applications, these decentralized generation units and applications were further developed in order to allow for a standardized plug-and-play-interface of consumption- and generation flexibilities. eTelligence proved thermal-electrical energy units such as cold storages or engine-based cogeneration units to be excellent storage facilities. In times of excess generation from wind power, the cold storage houses cooled down strongly in order to create a cold buffer. In times of high electricity prices, the cooling aggregates could then be switched off. Making use of the previously built-up cold buffer, the cold storage houses could be operated under minimum consumption for a few days. Scaled up to yearly costs, the cold storage’s energy costs could be decreased by up to 6 per cent even though the full efficiency potential has not been accessed, yet.
The interfaces between commercial end-users with thermal storage and the eTelligence system became successful to an extent that raised the interest of other commercial end-users and consortium lead EWE AG, who is now offering the EWE Electricity Intelligent Load Manager and has already integrated new commercial customers in its system. Furthermore, the consortium partner energy and meteo systems managed to improve and update its prognosis software thereby rendering prognoses for e.g. virtual power plants more accurate and facilitating their market entrance.
eTelligence’s marketplace system furthermore offers new chances for the marketing of flexibilities from engine-based cogeneration units. It can e.g. enable their economically efficient operation after government subsidies cease to exist. Additionally, 650 households have trialled the suitability of Smart Meters for everyday use in their homes. Being equipped with different feedback systems, the participants could bear in mind their consumption, the deriving costs, CO2 emissions and start to analyse their own behavioural patterns. The two eTelligence tariffs, the „Quantity Tariff“ and the so called „Event Tariff“, delivered promising results regarding energy efficiency and load shifting potentials. The „Quantity Tariff“ offers incentives to reduce the overall household consumption and led to monthly consumption reductions of up to 13 per cent in the households. The „Event Tariff“ is based on a time-of-use tariff and includes bonus- and malus-events in times of high or particularly low availability of electricity from renewable sources. It led to significant load shifting activities.
While a malus event was valid, it triggered reductions in consumption of 20 per cent on average. During bonus events, the field test customers could increase their consumption by up to 30 per cent. Customers surveys carried out throughout 70 per cent of all polled participants declared that they regularly monitored their consumption, 20 per cent actively controlled their consumption at least once a week.
This article is connected to the following knowledge articles:
eTelligence App as feedback system for customers – EWE
EWE trio smartbox
Advanced Metering Management System – BTC
EWE Power Intelligent Load Manager for commercial consumers – EWE
Innovative tariffs according to consumption and time (bonus and malus events) – EWE
Prognosis software – energy and meteo systems
Standards and Patent
Open source implementation of IEC 61850 standards – energy and meteo systems, Fraunhofer ISE, OFFIS
eTelligence (Model Region Cuxhaven)
Dr. Tanja Schmedes, EWE Aktiengesellschaft
Donnerschweer Straße 22 – 26, 26123 Oldenburg