Comparison

ISO Today vs TVA Energy Data

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ISO Today

Track California's power grid status, energy prices, and renewable production. Receive alerts for conservation needs and monitor supply adequacy up to seven days ahead. View detailed supply breakdowns and historical data.

Highlights
  • Monitor resource adequacy capacity
  • View grid status and demand
  • Renewables and supply graphs
  • Wholesale energy price map
  • Receive Flex Alerts
  • Track calendar events
Features
Read full description

Monitor California ISO power grid conditions, prices and renewable production, receive notifications and track calendar events with this free mobile application.   Features: · Monitor available resource adequacy capacity to identify when energy supply might be tight, up to 7 days in advance. · View grid status and available capacity measured against the current demand and the forecasted peak. · View renewables and supply graphs as stacked charts. · View peak and daily production data for past dates on the renewables trend graph. · View breakdown of supply and renewables serving the ISO. · Monitor emissions. · View wholesale energy prices on the price map. Use the slider to easily filter out nodes based on Location Marginal Prices (LMP). · Compare demand and net demand plus historic data. · Users can receive Flex Alerts to notify them when conservation is needed, get energy system notifications, along with ability to add ISO meetings and events to their calendar.   About the California ISO: As the nonprofit public-benefit corporation ensuring reliability for most of California's and a portion of Nevada's high-voltage power grid, the California Independent System Operator (ISO) is helping advance a smarter, cleaner, and more reliable energy future. The ISO operates a competitive energy market that balances supply with demand and has a key role in achieving clean energy goals in the West. For more information about California ISO, visit www.caiso.com.

About

TVA Energy Data

Access near real-time and historical energy usage data, demand information, and power system alerts. This app requires authorized access and is designed for TVA's directly served customers needing on-the-go information.

Highlights
  • Near real-time energy data
  • Current day interval data
  • Month-to-date usage and demand
  • Historical energy and demand
  • Power system alerts
  • TVA key contacts
Features
Read full description

Download the TVA Energy Data mobile app for an easy-to-use resource providing information to TVA’s directly served customers who need ready access to information away from their desktop computers. Authorized access is required. Information available: • Near real-time and current day interval data • Month-to-date energy usage and demand • Historical monthly energy and demand • Power system alerts • TVA key contacts

Screenshots

ISO Today4 screens
TVA Energy Data3 screens

Verdict

The call

The clearest difference is rating: TVA Energy Data at 5.0 against ISO Today's 4.2. TVA Energy Data also leads on review sentiment (100% vs 74%). ISO Today's advantage is ratings volume (102 vs 3). On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

TVA Energy Data holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: ISO Today has 102 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 74% of ISO Today's written reviews are positive against 100% of TVA Energy Data's.

UpkeepUpdate frequency

ISO Today ships an update every 3 months, TVA Energy Data every 6 months. The most recent releases landed on June 9, 2026 and September 14, 2026 respectively.

Scorecard3 real differences · 7 level
ISO Today versus TVA Energy Data: the parameters behind the verdict, then further details
ParameterISO TodayTVA Energy Data
PriceFreeFree
Rating4.2 (102 ratings)5.0 (3 ratings) — better
Positive reviews74.1% of reviews100.0% of reviews — better
Number of ratings102 — better3
Update frequencyEvery 3 months — betterEvery 6 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.013.0
Further details — not scored
Size11 MB26 MB
Age rating4+4+
DeveloperCalifornia Independent System Operator CorporationTennessee Valley Authority

Customer experience

ISO Today

All ratings101 ratings
Positive80.2%
Neutral4.0%
Negative15.8%
Written reviews58 reviews
Positive74.1%
Neutral6.9%
Negative19.0%

TVA Energy Data

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

ISO Today

No in-app purchases

None

TVA Energy Data

No in-app purchases

Questions

Is ISO Today free?
ISO Today is free to download, with no in-app purchases.
Is TVA Energy Data free?
TVA Energy Data is free to download, with no in-app purchases.
Which has better reviews, ISO Today or TVA Energy Data?
TVA Energy Data is rated higher. ISO Today averages 4.2 out of 5 from 102 ratings, while TVA Energy Data averages 5.0 from 3 ratings.
Do ISO Today or TVA Energy Data have ads?
Neither ISO Today nor TVA Energy Data shows ads.
Which is updated more often, ISO Today or TVA Energy Data?
ISO Today ships an update every 3 months, and TVA Energy Data every 6 months. Most recently, ISO Today was updated on June 9, 2026 and TVA Energy Data on September 14, 2026.

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