AC4DC AC4DC - Adaptive Computing for Green Data Centers: Raise of energy efficiency through intelligent load balancing and infrastructure management, from the distributor to the user


As of today, in the internet and communications technology (ICT), isolated single-optimized server systems are often suspect of unused capacities and hence a high energy demand. The project AC4DC plans to develop methods to reduce this energy demand by optimizing the operation of ICT systems as a whole, including end users, office PCs, data centres, data networks and energy providers in terms of energy demand and total costs.

The holistic view of the system not only creates extensive possibilities of energy saving but also enables a load optimization in power networks, especially in smart grids.


To accomplish the project's aims, intelligent forms of management of load in data centres, infrastructure and data storage will be researched. These will be applied to single data centres as well as to a cluster of multiple data centres.


This three-step approach partially enables the parallel achievement of the project's aims. The concepts developed will then be implemented as prototypes and tested in partly isolated environments. This is then used to evaluate the energy saving potential.


The optimization will also reflect influences such as user behaviour, economic requirements and site-specific parameters. The systematic and early involvement of data centre operators assures the project's market-orientation. In addition highly-effective business models and potentials to save energy and material will be identified.


OFFIS is significantly involved in multiple work areas of the project. Analysis of existing data as well as the accomplishment of new measurements in data centres are an essential part to be able to make statements about the energy demand of servers and complete data centres. This also includes the development of new measurement technologies.

In addition new models will be developed and evaluated which allow for a proactive controlling and sharing of services across servers. These models will also take into account the cooling systems for servers and data centres.

Finally an implementation of a prototype of the system will be developed and used to prove that the results are also relevant in practical use.



Scientific Director

Workload Dependent Load and Power Management for Virtual Desktop Infrastructures

Daniel Schlitt, Stefan Janacek, Gunnar Schomaker; 08 / 2014

Adaptive computing and server virtualization in German data centers - Potentials for increasing energy efficiency today and in 2020

Hintemann, Ralph and Fichter, Klaus and Schlitt, Daniel; Proceedings of the 28th EnviroInfo 2014 Conference; 2014

AC4DC - Adaptive Computing For Green Data Centers - a Future Perspective of Energy and Cos Efficient Datacenters

Hoyer, Marko and Schlitt, Daniel and Schomaker, Gunnar and Schröder, Kiril and ; 009 / 2011

Effizienzbewertung mit Schwächen

Schlitt, Daniel and Mayer, Christoph; 12 / 2011

Demand Response and Site Management for Cloud based Services

Schröder, Kiril and Nebel, Wolfgang; 2012 International Conference on Energy Aware Computing; 12 / 2012

Load Dependent Data Center Energy Efficiency Metric Based on Component Models

Schlitt, Daniel and Nebel, Wolfgang; 2012 International Conference on Energy Aware Computing; 12 / 2012

Data Center Performance Model for Evaluating Load Dependent Energy Efficiency

Daniel Schlitt, Wolfgang Nebel; Proceedings of ICT for Sustainability 2016; 08 / 2016

Data Center Smart Grid Integration Considering Renewable Energies and Waste Heat Usage

Janacek, Stefan and Schomaker, Gunnar and Nebel, Wolfgang; 05 / 2013

Energieeffiziente Software

Nebel, Wolfgang and Schomaker, Gunnar and Helms, Domenik; 12 / 2013

Inter Cloud Capable Dynamic Resource Management with Model of Behavior

Schröder, Kiril and Nebel, Wolfgang; SAC '13 Proceedings of the 28th Annual ACM Symposium on Applied Computing; 03 / 2013

Expansion of Data Center’s Energetic Degrees of Freedom to Employ Green Energy Sources

Stefan JanacekWolfgang Nebel; Proceedings of the 28th EnviroInfo 2014 Conference, Oldenburg, Germany ; 09 / 2014

Behavioral Model for Cloud aware Load and Power Management

Schröder, Kiril and Nebel, Wolfgang; HotTopiCS '13: Proceedings of the 2013 international workshop on Hot topics in cloud services; 04 / 2013

The Energy Demand of Data Centers

Stefan JanacekDaniel SchlittGunnar Schomaker; 08 / 2014

Rechenzentrum im Smart Grid

Stefan JanacekGunnar Schomaker; Energy 2.0 Kompendium ; 11 / 2013

Gain More from PUE: Assessing Data Center Infrastructure Power Adaptability

Daniel Schlitt, Gunnar Schomaker and Wolfgang Nebel; Energy-Efficient Data Centers, Third International Workshop, E²DC 2014, Cambridge, UK, June 10, 2014; 06 / 2014

Borderstep Institut für Innovation und Nachhaltigkeit gemeinnützige GmbH
Microsoft Deutschland GmbH
Rittal GmbH & Co. KG
Universität Paderborn
Würz Energy GmbH
Zweckverband Kommunale Datenverarbeitung Oldenburg (KDO)


Start: 30.04.2011
End: 30.04.2014