Software · head to head
Stem Athena vs HOMER Energy
HOMER Energy
Software
Microgrid and distributed energy optimization software
- From
- Free
- Rated
- -
The short version
- Only HOMER Energy has a free tier, so it costs nothing to try first.
- Each has a real cost: Stem Athena stem's site names the product PowerTrack Optimizer, formerly Athena, so the Athena name is retired; HOMER Energy now owned by UL Solutions rather than being independent
- They diverge on capability: Stem Athena covers AI optimization, HOMER Energy covers Microgrid optimization.
Where they differ
Only the attributes on which Stem Athena and HOMER Energy actually diverge.
| Attribute | Stem Athena | HOMER Energy |
|---|---|---|
| Starting price | On request | Free |
| Free tier | No | Yes |
| Platforms | Web, Mobile, Api | Windows, Web |
Identical on both: pricing model (subscription), user rating (Not yet rated), category (Unknown), founded (2009).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Stem Athena
- AI optimization
- Energy storage management
- Demand charge reduction
- Grid services
- Solar integration
- Weather forecasting
- Performance analytics
- Remote monitoring
Only in HOMER Energy
- Microgrid optimization
- Techno-economic analysis
- Component library
- Sensitivity analysis
- Energy storage sizing
- Renewable integration
- Load profile analysis
- Financial modeling
Both cover
- Data encryption
- Cloud deployment
What people use each for
The jobs each tool is most often brought in to do.
Stem Athena
- Optimising dispatch and market participation of battery energy storagenot HOMER Energy
- Monitoring and reporting on solar and storage asset performancenot HOMER Energy
- Remote diagnostics across renewable generation fleetsnot HOMER Energy
HOMER Energy
- Sizing and optimising off-grid and microgrid systemsnot Stem Athena
- Modelling the economics of solar, wind and battery combinationsnot Stem Athena
- Electric bill optimisation for grid-connected sites and EV chargingnot Stem Athena
- Utility-scale storage investment analysisnot Stem Athena
- Comparing least-cost configurations against load and resource datanot Stem Athena
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Stem Athena
- Stem's site names the product PowerTrack Optimizer, formerly Athena, so the Athena name is retired
- No price, subscription fee or contract term is published anywhere on the site
- The optimizer is one component of the wider PowerTrack suite alongside separate EMS, SCADA, Power Plant Controller and Logger products rather than a standalone licence
- Design, procurement, commissioning and operation are sold as managed services separate from the software
HOMER Energy
- Now owned by UL Solutions rather than being independent
- Split into three separate products, HOMER Pro for off-grid and microgrids, HOMER Grid for bill optimisation and HOMER Front for utility-scale, so the right one depends on project type
- Pricing is not shown on the product pages
Pricing, plan by plan
Stem Athena
On request- Commercial$undefined/custom
- Energy storage optimization
- Demand charge management
- Rate optimization
- Utility$undefined/custom
- Grid services
- VPP management
- Frequency regulation
- Enterprise$undefined/custom
- Fleet management
- Portfolio optimization
- Custom integrations
HOMER Energy
Free- HOMER GridFree
- Grid-connected optimization
- Basic components
- Limited simulations
- HOMER Pro$1500/year
- Advanced optimization
- All components
- Unlimited simulations
- Enterprise$undefined/year
- Multi-user licenses
- API access
- Custom modules
Which should you pick?
Choose Stem Athena if
- You need ai optimization.
- You work on Web, Mobile, Api.
- You also want energy storage management.
Choose HOMER Energy if
- You need microgrid optimization.
- You want to start without paying.
- You work on Windows, Web.
- You also want techno-economic analysis.
Questions people ask
- Is Stem Athena or HOMER Energy better?
- Neither clearly leads. Stem Athena starts at On request and HOMER Energy at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Stem Athena or HOMER Energy?
- HOMER Energy has a free tier; the other does not. Paid plans start at On request for Stem Athena and Free for HOMER Energy.
- Does Stem Athena or HOMER Energy run on more platforms?
- Stem Athena runs on Web, Mobile, Api. HOMER Energy runs on Windows, Web.
- Can I use HOMER Energy for free?
- Yes. HOMER Energy has a free tier, so you can try it without paying. Stem Athena starts at On request.
- What is Stem Athena best used for?
- Stem Athena is most often used for optimising dispatch and market participation of battery energy storage, monitoring and reporting on solar and storage asset performance, remote diagnostics across renewable generation fleets. Of those, optimising dispatch and market participation of battery energy storage and monitoring and reporting on solar and storage asset performance are not what HOMER Energy is typically brought in for.
- What can Stem Athena do that HOMER Energy cannot?
- Stem Athena covers AI optimization, Energy storage management, Demand charge reduction, Grid services. HOMER Energy covers Microgrid optimization, Techno-economic analysis, Component library, Sensitivity analysis. Both handle Data encryption, Cloud deployment.