Fever Energy
Fever Energy is a Stockholm platform company that lets energy companies such as Vattenfall and Varberg Energi run home-battery, solar and EV flexibility services under their own brand, rather than aggregating households itself.
It is the white-label alternative to independent aggregators like CheckWatt, but its performance claims rest on the company's own numbers and none is independently verified.
Fever Energy AB is a Swedish technology company (founded 2022, Stockholm) whose platform lets energy companies launch and run flexibility services for household batteries, solar, EVs and chargers under their own brand. It is a white-label platform, not a consumer-facing aggregator: “Fever does not sell to households.” Every figure below is the company’s own, from Source - Fever Energy Website (2026) and Source - Fever Energy News (2025-2026); nothing here is independently verified.
Overview
| Attribute | Value (Fever’s own claim) |
|---|---|
| Founded / HQ | 2022, Stockholm |
| Scale | 10,000+ installations, 600 MWh under management, across the Nordics |
| Average end-customer value | 975 €/year (earnings plus savings, Nordic markets) |
| Markets | Sweden; Denmark since 30 October 2025 |
| Investors named | General Catalyst, Norrsken VC, La Famiglia, Greens |
| Recognition | 6th on the Sifted 100: Nordics 2026 (revenue growth ranking; no Fever figures given) |
The model
Fever sells the technology layer; the energy company keeps the customer relationship and the brand. Its stated offer is “Home Energy Management as a Service today, aggregated into your own virtual power plant tomorrow” — first optimise each home for savings and market revenue, then aggregate the portfolio into a Virtual Power Plant. The platform combines five modules (connect, insight, predict, optimise, trade), a shared data model linking asset, site, customer and contract, and interfaces for the utility’s own teams, installers and homeowners (a white-label app). A postal gateway connects assets that have no cloud connection, so older equipment can take part. Customers choose a pre-built, embedded or API-integrated path. Fever claims that optimising both sides of the meter together generates “up to three times as much value per installation” (no baseline stated).
This differs from aggregators that hold a market role themselves: CheckWatt acts as BSP (through a BRP intermediary in Sweden) and works with households through its own hardware and partners, and Flower has its own BRP status and is expanding API-first into home assets, so it is closer to Fever but remains a market participant. What Fever holds in the market chain (BSP, BRP, or neither) is not stated anywhere in the sources; its June 2026 optimiser article only mentions “retaining the existing BRP” for batteries that switch to Fever.
Customers named by Fever
- Vattenfall (Decentral Energy Solutions Nordic): its smart steering service Nätverka Batteri, announced 1 September 2026, is built on Fever’s platform.
- Varberg Energi (Sweden): customer since 2023; Fever says it became their primary platform, replacing several providers and used also for the utility’s own imbalances; 1,200+ residential assets onboarded “within days”; Fever cites 3x homeowner revenue growth and +30% trading performance. Varberg Energi’s V2G pilots with Ferroamp use Varberg Energi’s own app; the sources do not say whether that app runs on Fever.
- Evolta (Sweden): batteries and EVs steered via Fever, with a Fever View-based customer app; 77 €/month average end-customer value.
- Enequi (Denmark): full API integration keeping its own gateway; 117 €/month average end-customer value; five price regions across two countries.
Reading the numbers with care
- The 975 €/year, 77 €/month and 117 €/month figures combine savings and market earnings; the split, the asset types and the period are not given, so they cannot be compared with revenue-only figures such as the FCR-D numbers on CheckWatt.
- “More than twice the Clean Horizon benchmark” (January 2026) comes with no absolute figures, portfolio size or market mix, and Clean Horizon changed its index methodology that month (Source - Clean Horizon Storage Index (2026)); the four Nordic Storage Index series now in the wiki do not reproduce Fever’s fall, see Nordic Battery Revenue Trends 2023–2026 › The Fever Energy benchmark claim.
- The Swedish national totals Fever cites (about 800,000 EVs, 287,000 rooftop solar installations, 80,000+ home batteries; “in Sweden alone”, not its own portfolio) are unsourced, and it is not stated whether “electric vehicles” means battery EVs only or all chargeable cars; compare the fleet figures on Source - V2G-Capable EV Models and Fleet Battery Capacity Sweden (2026).
- The 600 MWh over 10,000 installations implies about 60 kWh per installation on average (wiki arithmetic, not a Fever figure); the sources do not break the portfolio down by asset type.
Related pages
- Aggregation — the aggregator role and the independent-aggregator models Fever sits beside
- Virtual Power Plant — the aggregated end state Fever describes
- Nordic Battery Revenue Trends 2023–2026 — the Clean Horizon index series behind the benchmark Fever cites
- CheckWatt, Flower — aggregators that hold a market role themselves, for contrast
- Ferroamp — hardware partner of Varberg Energi’s V2G pilots
- Vehicle-to-Grid and Source - Vattenfall Energy Bank VW V2G Pilot 2025-2026 — Vattenfall’s other home-flexibility route, on Energy Bank’s platform
Data gaps
- Which market roles and revenue streams Fever’s platform trades in Sweden (FCR-D, mFRR, spot, local markets) and who acts as BSP and BRP for the utilities using it