Valo (Wärtsilä and RCT Solutions)
Grid-scale storage integrator
Ranked #8 in Best Energy Storage Companies.
Valo is a 50/50 joint venture between Wärtsilä and Germany's RCT Solutions that took over Wärtsilä's energy storage business on 1 October 2026. It started with more than 20 GWh of projects and over 130 active utility-scale projects worldwide.
At a glance
| Price from | Custom |
| Best for | Utilities wanting an integrator with a long project record |
From Valo (Wärtsilä and RCT Solutions)'s own website.
What stands out
- Inherits a large global project portfolio
- Backed by Wärtsilä's engineering and service network
Worth knowing
- New company name and structure
- Expected to stay loss-making for now
How it ranks
Valo (Wärtsilä and RCT Solutions) is ranked 8th of 10 in Best Energy Storage Companies (Lister Score 88.1).
#8 in Best Energy Storage Companies · Lister Score 88.1
Wärtsilä's energy storage business had net sales of 694 million euros in 2025 before moving into Valo..
| Rank | Best Energy Storage Companies | Score |
|---|---|---|
| 1 | Tesla Energy (Megapack) | 97.3 |
| 2 | BYD Energy Storage | 96.0 |
| 3 | CATL | 94.8 |
| 4 | Sungrow | 93.5 |
| 5 | Fluence | 92.2 |
| 6 | Hithium | 90.9 |
| 7 | LG Energy Solution Vertech | 89.5 |
| 8 | Valo (Wärtsilä and RCT Solutions) | 88.1 |
| 9 | Canadian Solar e-STORAGE | 86.7 |
| 10 | Form Energy | 85.3 |
Frequently asked questions
How does Valo (Wärtsilä and RCT Solutions) rank on Lister?
Valo (Wärtsilä and RCT Solutions) is ranked 8th of 10 in Best Energy Storage Companies (Lister Score 88.1).
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