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Energy · head to head

HOMER Energy vs Stem Athena

HOMER Energy logo

HOMER Energy

Energy

Microgrid and distributed energy optimization software

From
$187.5/month
Rated
-
Full reviewWebsite
Stem Athena logo

Stem Athena

Energy

AI-driven clean energy optimization

From
On request
Rated
-
Full reviewWebsite

The short version

  • 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.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which HOMER Energy and Stem Athena actually diverge.

Attributes where HOMER Energy and Stem Athena differ
AttributeHOMER EnergyStem Athena
Starting price$187.5/monthOn request
PlatformsWindows, WebWeb, Mobile, Api

Identical on both: pricing model (subscription), free tier (No), user rating (Not yet rated), category (Energy), 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

  • Energy asset optimization and managementnot HOMER Energy
  • Renewable energy integrationnot HOMER Energy
  • Energy storage managementnot HOMER Energy
  • Grid operations optimizationnot 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

$187.5/month
  • Base$187.5/month
    • No modules included; add individually
    • Basic support
    • Software updates
  • Professional$373.5/month
    • Any 4 modules included (Biomass Generation, Run of River Hydro, Advanced Grid, Advanced Load, etc.)
    • Basic support
    • Software updates
  • Expert$568.5/month
    • All modules included: Biomass, Hydro, Hydrogen, Advanced Grid/Load/Storage, Combined Heat & Power, Multi-Year, MATLAB Link
    • Basic support
    • Software updates

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 work on Windows, Web.
  • You also want techno-economic analysis.
HOMER Energy review

Choose Stem Athena if

  • You need ai optimization.
  • You work on Web, Mobile, Api.
  • You also want energy storage management.
Stem Athena review

Questions people ask

Is HOMER Energy or Stem Athena better?
Neither clearly leads. HOMER Energy starts at $187.5/month 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 starts at $187.5/month and Stem Athena at On request.
Does HOMER Energy or Stem Athena run on more platforms?
HOMER Energy runs on Windows, Web. Stem Athena runs on Web, Mobile, Api.
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.

Answered from the vendors’ own pages

HOMER Energy: What are the pricing options for HOMER Energy?

HOMER Energy pricing information is not publicly available on their website. Customers must contact the vendor directly to obtain pricing information, trial access, and licensing options.

Source
Stem Athena: How much does Stem Athena cost?

Stem does not publish pricing for Athena on its website. The company appears to use a custom enterprise pricing model. Interested customers must contact Stem directly through their website to inquire about pricing and availability.

Source
HOMER Energy: Does HOMER Energy offer a free trial or demo?

Trial or demo availability cannot be confirmed from publicly accessible pages. Visit the main website or contact HOMER Energy sales directly to inquire about evaluation options.

Source
Stem Athena: Does Stem offer a free trial?

The Stem website does not mention a free trial or demo option for Athena. Customers are directed to contact Stem's sales team for information about trial access or pricing.

Source
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