Watch power flow
See exactly how voltage and current move through every wire and connection — the moment anything changes.
A free, open-source fork of OpenDSS that lets you model a real electric grid, add solar, batteries, and EV chargers, then watch how the power moves — so you can plan a cleaner, steadier grid before you build it.
Powerful enough for utility engineers, clear enough to explore on your own.
See exactly how voltage and current move through every wire and connection — the moment anything changes.
Drop in solar panels, home batteries, and EV chargers, then see how they change the grid around them.
Run your grid minute-by-minute across a busy day or a whole year to catch the moments that matter.
Find out what happens during a fault or outage — before it happens — so the grid stays safe and reliable.
Already a coder? Script thousands of scenarios and plug OpenDSS straight into your own tools.
Open source, forever. Read it, extend it, share it — no license fees and no black boxes.
No special hardware, no waiting. Describe a grid and press solve.
Lay out the lines, transformers, and homes — it's all just a simple text file you can edit anywhere.
Attach the pieces you care about and set how big they are. Change your mind as many times as you like.
SolveOpenDSS works out the voltages, currents, and losses everywhere — instantly, and ready to chart.
Here's a small neighborhood with a home and rooftop solar. Add a few lines, choose how you want to solve, and you're done. When you're ready for more, the same file scales to a whole city.
# start from the utility connection New Circuit.Neighborhood ~ basekv=12.47 phases=3 bus1=Grid # run a line down the street New Line.Main bus1=Grid bus2=Street length=500 # connect a home New Load.House bus1=Street kV=0.24 kW=6 # add rooftop solar New PVSystem.Roof bus1=Street kVA=5 Pmpp=5 # solve and see the result Set mode=snap Solve
Pick how you want to look at it — one moment, a full day, a whole year, or a worst-case fault.
New releases, friendly help, and the best tips for modeling real grids — the discussion forum is where everything new lands first.
Open the forum