Energy & Utilities · head to head
HOMER Energy vs Stem Athena
HOMER Energy
Energy & Utilities
Microgrid and distributed energy optimization software
- From
- Free
- Rated
- -
S
Stem Athena
Energy & Utilities
AI-driven clean energy optimization
- From
- On request
- Rated
- -
The short version
- Only HOMER Energy has a free tier, so it costs nothing to try first.
- Each has a real cost: HOMER Energy now owned by UL Solutions rather than being independent; Stem Athena stem's site names the product PowerTrack Optimizer, formerly Athena, so the Athena name is retired
- They diverge on capability: HOMER Energy covers Microgrid optimization, Stem Athena covers AI optimization.
Where they differ
Only the attributes on which HOMER Energy and Stem Athena actually diverge.
| Attribute | HOMER Energy | Stem Athena |
|---|---|---|
| Starting price | Free | On request |
| Free tier | Yes | No |
| Platforms | Windows, Web | Web, Mobile, Api |
Identical on both: pricing model (subscription), user rating (Not yet rated), category (Energy & Utilities), 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 HOMER Energy
- Microgrid optimization
- Techno-economic analysis
- Component library
- Sensitivity analysis
- Energy storage sizing
- Renewable integration
- Load profile analysis
- Financial modeling
Only in Stem Athena
- AI optimization
- Energy storage management
- Demand charge reduction
- Grid services
- Solar integration
- Weather forecasting
- Performance analytics
- Remote monitoring
Both cover
- Data encryption
- Cloud deployment
What people use each for
The jobs each tool is most often brought in to do.
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
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
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
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
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
Pricing, plan by plan
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
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
Which should you pick?
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.
Choose Stem Athena if
- You need ai optimization.
- You work on Web, Mobile, Api.
- You also want energy storage management.
Questions people ask
- Is HOMER Energy or Stem Athena better?
- Neither clearly leads. HOMER Energy starts at Free and Stem Athena at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, HOMER Energy or Stem Athena?
- HOMER Energy has a free tier; the other does not. Paid plans start at Free for HOMER Energy and On request for Stem Athena.
- Does HOMER Energy or Stem Athena run on more platforms?
- HOMER Energy runs on Windows, Web. Stem Athena runs on Web, Mobile, Api.
- 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 HOMER Energy best used for?
- HOMER Energy is most often used for sizing and optimising off-grid and microgrid systems, modelling the economics of solar, wind and battery combinations, electric bill optimisation for grid-connected sites and ev charging, utility-scale storage investment analysis. Of those, sizing and optimising off-grid and microgrid systems and modelling the economics of solar, wind and battery combinations are not what Stem Athena is typically brought in for.
- What can HOMER Energy do that Stem Athena cannot?
- HOMER Energy covers Microgrid optimization, Techno-economic analysis, Component library, Sensitivity analysis. Stem Athena covers AI optimization, Energy storage management, Demand charge reduction, Grid services. Both handle Data encryption, Cloud deployment.