Phase Nexa

Developer tools for European energy trading. Open source libraries for market data, bid generation, and exchange connectivity.

Developer tools for the 75% who build their own.

75% of Nord Pool's customer base connects directly via API. They are quants, data scientists, and developers who build and maintain their own trading infrastructure. Phase Nexa gives them better tools to do it.

The problem

Every energy trading company in Europe has developers writing the same code: ENTSO-E API wrappers that break when the format changes. Bid generators that need rebuilding for 15-minute MTUs. Position trackers held together with spreadsheets and prayer.

The ISVs want to sell you a platform. We want to give you libraries.

The libraries

Python

nexa-marketdata

Unified API client for Nord Pool, EPEX SPOT, ENTSO-E, and EEX. Handles 15-minute MTU data, rate limiting, caching, and timezone normalisation. Replaces entsoe-py and the fragmented community wrappers.

pip install nexa-marketdata

Learn more | GitHub

Python

nexa-bidkit

Day-ahead and intraday auction bid generation. Correct domain modelling of EUPHEMIA bid types (block bids, linked orders, exclusive groups) with exchange-specific serialisation for Nord Pool, EPEX SPOT, and EEX.

pip install nexa-bidkit

Learn more | GitHub

Python

nexa-mfrr-nordic-eam

mFRR energy activation market bids for Nordic TSOs. Correct domain modelling of ENTSO-E mFRR bid types (simple, linked, exclusive groups, multipart, inclusive groups) with TSO-specific validation and CIM XML serialisation for Statnett, Svenska kraftnät, Energinet, and Fingrid.

pip install nexa-mfrr-nordic-eam

Learn more | GitHub

Why now

On 30 September 2025, European power markets transitioned from hourly to 15-minute Market Time Units. Instead of 24 intervals per day, traders now manage 96. Every bidding algorithm, data pipeline, and position tracker needs updating.

For self-builders, this is not a software update you click a button for. You have to rebuild. Phase Nexa gives you the building blocks to do it properly.

Open source, commercially supported

Every Phase Nexa library is MIT-licensed. Use them freely. Fork them. Build on them. Contribute to them.

Premium support, hosted services, and SLAs are coming soon for teams that need them.

Coming Soon Premium tiers including hosted data proxies, bid optimisation services, and priority support. Learn more.

Built by energy trading developers

Phase Nexa is built by people who have spent years building trading systems. We know what breaks at 06:00 when the day-ahead auction clears. We know what ENTSO-E does to your pipeline when they change the API without notice. We know because we have been there.

Get started | View on GitHub | Join the community