diff --git a/README.md b/README.md
index 07cec605..ef011e1c 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,16 @@ Create a parallel directory for PyPSA-Eur-Sec with:
 projects % git clone git@github.com:nworbmot/pypsa-eur-sec.git
 ```
 
+## Package requirements
+
+The requirements are the same as
+[PyPSA-Eur](https://github.com/PyPSA/pypsa-eur), but for
+`solve_network.py` in addition you need `gurobipy` and the `nomopyomo`
+branch of PyPSA, which are currently imported "by hand" at the start
+of the `solve_network.py` script. The `nomopyomo` branch will be
+merged into the future PyPSA release 0.16.0.
+
+
 ## Data requirements
 
 The data requirements include the JRC-IDEES-2015 database, JRC biomass
diff --git a/scripts/solve_network.py b/scripts/solve_network.py
index 502c7142..98311153 100644
--- a/scripts/solve_network.py
+++ b/scripts/solve_network.py
@@ -4,10 +4,13 @@ os.system("conda config --add channels http://conda.anaconda.org/gurobi")
 
 os.system("conda install -y gurobi=8.1.0")
 
+os.system("conda install -y git")
 
-import sys
+os.system("pip install -U git+git://github.com/PyPSA/pypsa.git@nomopyomo#egg=pypsa")
 
-sys.path = ["pypsa"] + sys.path
+#import sys
+
+#sys.path = ["pypsa"] + sys.path