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Energy · head to head

OSIsoft PI System vs Stem Athena

OSIsoft PI System logo

OSIsoft PI System

Energy

Real-time operational intelligence for industrial operations

From
On request
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: OSIsoft PI System oSIsoft is now AVEVA and osisoft.com redirects to the AVEVA PI System pages; Stem Athena stem's site names the product PowerTrack Optimizer, formerly Athena, so the Athena name is retired
  • They diverge on capability: OSIsoft PI System covers Real-time data collection, Stem Athena covers AI optimization.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which OSIsoft PI System and Stem Athena actually diverge.

Attributes where OSIsoft PI System and Stem Athena differ
AttributeOSIsoft PI SystemStem Athena
Pricing modelquotesubscription
PlatformsWindows, Web, ApiWeb, Mobile, Api
Founded19802009

Identical on both: starting price (On request), free tier (No), user rating (Not yet rated), category (Energy).

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 OSIsoft PI System

  • Real-time data collection
  • Time-series data storage
  • Advanced analytics
  • Asset framework
  • Visualization tools
  • Event frames
  • Data compression
  • Notifications and alerts

Only in Stem Athena

  • AI optimization
  • Energy storage management
  • Demand charge reduction
  • Grid services
  • Solar integration
  • Weather forecasting
  • Performance analytics
  • Remote monitoring

Both cover

  • SOC2

What people use each for

The jobs each tool is most often brought in to do.

OSIsoft PI System

  • Collecting and historising high frequency industrial process and sensor datanot Stem Athena
  • Operations dashboards and trend analysis for plants and utilitiesnot Stem Athena
  • Feeding real time operational data into analytics and digital twin applicationsnot Stem Athena

Stem Athena

  • Energy asset optimization and managementnot OSIsoft PI System
  • Renewable energy integrationnot OSIsoft PI System
  • Energy storage managementnot OSIsoft PI System
  • Grid operations optimizationnot OSIsoft PI System

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

OSIsoft PI System

  • OSIsoft is now AVEVA and osisoft.com redirects to the AVEVA PI System pages
  • No pricing is published; osisoft.com/pricing resolves to AVEVA product pages with no rate, minimum or cost driver
  • Licensing runs through the AVEVA Flex Subscription Program rather than a published per-seat or per-tag price
  • The PI System is split across separately listed products including PI Server, PI Vision, PI Data Infrastructure and Edge Data Store

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

OSIsoft PI System

On request

No published plan breakdown. See the OSIsoft PI System review.

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 OSIsoft PI System if

  • You need real-time data collection.
  • You work on Windows, Web, Api.
  • You also want time-series data storage.
OSIsoft PI System 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 OSIsoft PI System or Stem Athena better?
Neither clearly leads. OSIsoft PI System starts at On request and Stem Athena at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, OSIsoft PI System or Stem Athena?
OSIsoft PI System starts at On request and Stem Athena at On request.
Does OSIsoft PI System or Stem Athena run on more platforms?
OSIsoft PI System runs on Windows, Web, Api. Stem Athena runs on Web, Mobile, Api.
What is OSIsoft PI System best used for?
OSIsoft PI System is most often used for collecting and historising high frequency industrial process and sensor data, operations dashboards and trend analysis for plants and utilities, feeding real time operational data into analytics and digital twin applications. Of those, collecting and historising high frequency industrial process and sensor data and operations dashboards and trend analysis for plants and utilities are not what Stem Athena is typically brought in for.
What can OSIsoft PI System do that Stem Athena cannot?
OSIsoft PI System covers Real-time data collection, Time-series data storage, Advanced analytics, Asset framework. Stem Athena covers AI optimization, Energy storage management, Demand charge reduction, Grid services. Both handle SOC2.

Answered from the vendors’ own pages

OSIsoft PI System: How much does the AVEVA PI System cost?

AVEVA PI System (formerly OSIsoft PI System) operates on a subscription-based commercial model with customized pricing. The company structures subscriptions to match specific use cases and business needs, requiring direct contact with account representatives.

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
OSIsoft PI System: What is AVEVA PI System's pricing model?

AVEVA offers subscription-based licensing for software components running on-premises or in the cloud. Subscriptions are customized per customer use case, and pricing is determined through consultation with local account representatives.

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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