ISO Today vs TVA Energy Data
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Monitor resource adequacy capacity
- View grid status and demand
- Renewables and supply graphs
- Wholesale energy price map
- Receive Flex Alerts
- Track calendar events
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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.
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.
- 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
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
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.
| Parameter | ISO Today | TVA Energy Data |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (102 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 74.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 102 — better | 3 |
| Update frequency | Every 3 months — better | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 11 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | California Independent System Operator Corporation | Tennessee Valley Authority |
Customer experience
ISO Today
TVA Energy Data
In-app purchases
ISO Today
No in-app purchases
TVA Energy Data
No in-app purchases









