Robust Results

Just some minutes ago, oemof.solph v0.6.2 (codenamed “robust results”) has landed (GitHub, Zenodo, PyPI). It is no surprise that one focus of this release is the Results object. It is now in a status which we consider stable for productive use. At the same time, we also fixed the old processing.results, which is still handy e.g. when using TSAM, to work with Pandas 3.x.

We recommend to also update oemof.network. Today’s release v0.5.2 (GitHub, Zenodo, PyPI) allows to compare Nodes and their string representations. This sounds rather technical but is a real game changer when analysing results. Consider the following:

Continue reading “Robust Results”

Join the upcoming oemof meetings

In just a bit more than a month the next oemof user meeting takes place in Nordhausen parallel to the RET.Con conference. From February 11 to 13 you can join us. You will have the chance to exchange with other oemof users and developers, learn something new in the tutorials and also connect with the participants of the RET.Con. Also, the general assembly of the oemof association will be held at the event. For registration and agenda details check out the wiki page on github: https://github.com/oemof/oemof/wiki/Meeting-2026.02

Two months later the second TESPy meeting will be hosted at the TU Braunschweig from April 13 to 15. We plan some tutorials and many hackathons to work on a couple of open issues and potential new features. Get all the information here: https://github.com/oemof/oemof/wiki/Meeting-2026.04%3A-tespy-user-meeting

Release of “Fractal Fun”

Over the past months, we worked on methods to allow adding more structure to energy system models: It should be simpler to group Nodes (such as Sources or Converters). There are several things that benefit from this, for example cellular models or models spanning several geographical regions. Also, there were several implementations building on top of solph that aimed for this very same thing.

So, with oemof.network v0.5.1 (Github, PyPI, Zenodo) and oemof.solph v0.6.1 (GitHub, PyPI, Zenodo) every Node can now have parent nodes and contain sub-nodes. As both can be added after creation, we codenamed the releases “fractal fun”. When using the new function subnode(class_, local_name, ..) (see documentation) to create new Nodes, labels are automatically created that represent the hierarchy.

Helpers for result processing are currently being implemented. A graph visualisation in oemof.visio has already been implemented and is available as a packaged pre-release (GirHub, PyPI). For a brief code example producing the illustrative figures used here, see oemof.visio:examples/oemof_model_subnetworks.py.

2025.10 first ever TESPy community meeting

TESPy has been part of the oemof organization for about eight years. While it has always been represented at the meetings, it was time for the first ever TESPy community meeting!

Last week around ten of us got together at the University of Applied Sciences in Flensburg to discuss where TESPy is headed and how we can make open source thermodynamics even better. The discussions covered a broad range of topics:

  • A review of the most recent feature additions
  • Beginner tutorials
  • Debugging with tespy version 0.9
  • Custom equations into your model
  • Implementation of new components
  • Showcases of how the software is used
  • Strategies for the operation of large scale heat pumps

During the hackathon an addition to a component was not only drafted on paper but actually implemented in the framework. And, it has already
made it to the latest release of TESPy.

It was really inspiring to meet others working with the software, exchange ideas, and see how the community is growing. Thanks to everyone who took their time to come to Flensburg to join the meeting.


Looking forward to the next one!

Exploring the role of green hydrogen for distributed energy access planning towards net-zero emissions in Nigeria

Nigeria’s power system still relies heavily on captive diesel and petrol generators, with sizeable suppressed and unmet demand. The study by Shari et al. takes this reality as the starting point and uses the Open Energy Modelling Framework (oemof) to ask a question: given Nigeria’s 2060 net-zero target, how and where does green hydrogen make sense once you optimise the system transparently?
The model is implemented with oemof-solph as a cost-minimising linear optimisation. The energy system is represented in oemof’s graph structure which uses buses for carriers and components connected by flows. Electricity and hydrogen each have dedicated buses. Supply components include gas turbines and diesel sets alongside solar PV, onshore wind, hydropower and biomass. The hydrogen chain is modelled with standard solph components: an electrolyser transformer converts surplus electricity to hydrogen, a hydrogen storage component holds the gas, and a fuel-cell transformer reconverts it to electricity when needed. Batteries provide a parallel short-term storage route. Demand, exports and curtailment are represented as sinks. Figures in the paper show the reference energy system and a simplified green-hydrogen chain built exactly this way.

Continue reading “Exploring the role of green hydrogen for distributed energy access planning towards net-zero emissions in Nigeria”

2025.09 dev meeting retrospective

For the last three days, we were meeting at HTW in Berlin for our semi-annual developer meeting. Here are some of the key results:

  • We plan to have an improved lecture/ tutorial session, that might eventually develop into a summer school.
  • There will be a release of oemof.solph mid November. It will include whatever is done until then.
  • Costs calculations in oemof.solph will be aligned with VDI 2067. We plan to distinguish between energy-related costs (€/kWh), capacity related operational costs (€/kW/a), fixed operational costs (€/a) for OPEX and capacity related investment costs (€/kW/a) as well as an investment cost offset (€/a) for CAPEX. At the moment, we group by units, and thus have CAPEX and OPEX mixed.
  • The SubNetworks, we decided to have at the oemof 2025.02 developer meeting are functional, an example is merged in dev.
  • There is a software implementing robust optimisation. We plan to release something along these lines (as rolph).
  • Some of use will create an awareness concept. For upcoming meetings, there will be an awareness team you can contact if you do feel uncomfortable because of other participants or externals. We will also try to organise ourselves so that you can feel save on your trip back to the hotel.

See you next time (in Nordhausen)!

First tespy community meeting to be hosted in Flensburg

The first ever in-person community meeting of tespy will be held in one month in Flensburg. From October 13. to 15. we will meet at the location of tespy’s origin, Flensburg University of Applied Sciences. There are many interesting topics on the agenda, suitable from very beginners to advanced users and potential future developers.

You can find all details and register here: https://github.com/oemof/oemof/wiki/Meeting-2025.10%3A-tespy-user-meeting

See you in Flensburg!

Save the date: oemof user meeting 2026.02

Our next in-person user meeting will take place in Nordhausen from 11th to 13th of February 2026. It will be hosted by Nordhausen University of Applied Sciences partly parallel to the  9th Regenerative Energy Technology Conference (page in German).

We are posting this save the date already, as the parallel RET.Con also allows to submit contributions to its proceedings. If you wish to do so, please send an abstract (maximum two pages A4) to ret@hs-nordhausen.de. The deadline for abstracts to the RET.Con is the 15th of October. If accepted, full papers will be due at the 15th of January. Registration to the oemof track will be possible later, (as usual) without abstracts and proceedings.

2025.09 Developer Meeting in Berlin: Save the Date 

We just got the feedback that the next oemof meeting will be hosted by Reiner Lemoine Institut from September 15th to 17th at HTW Berlin. Due to the limited room capacity it will come as a developer meeting. Save the date and contribute, if you are interested! (Beginners, in particular first-time contributors, will get guidance, of course.) 

We created a wiki page for the Meeting 2025.09 to work on the agenda. 
 To register, you can either add your name to the linked Wiki page at GitHub, use the registration form, comment this post, or write an email to meetings@oemof.org.