Source - CheckWatt Website (2025-2026)
Five web clippings from CheckWatt AB’s website and EnergyInBalance customer portal, captured across two sessions (2026-04-28 and 2026-04-29). Together they provide the most detailed operational picture available of Sweden’s leading independent aggregator: business model, service stack, technology, scale, local flex market participation data, and company history.
Sources:
Raw/Clippings/Checkwatt main website.md— main website (checkwatt.com/en/, page date 2025-06-09; captured 2026-04-28 + WebFetch supplement)Raw/Clippings/Checkwatt website - About us.md— company overview (page date 2024-12-03; captured 2026-04-29)Raw/Clippings/Checkwatt website - Services.md— services and revenue benchmarks (page date 2025-05-31; captured 2026-04-29)Raw/Clippings/Checkwatt website - Frequently asked questions.md— technical FAQ (page date 2025-06-04; captured 2026-04-29)Raw/Clippings/Checkwatt - Energyinbalance.md— EnergyInBalance customer news feed (energyinbalance.se/news; 17 articles spanning approximately 2025–early 2026; captured 2026-04-29)
Statistics are self-reported marketing figures; no independent audit cited.
Summary
CheckWatt AB (Gothenburg) is Sweden’s largest residential battery aggregator and the Nordic region’s leading independent aggregator by customer count. As of early 2026 it manages 15,000+ customer sites across Sweden and Finland, with broader wind/solar/EV aggregation beyond home BESS. The clippings together document CheckWatt’s service stack, platform, market participation, revenue model, and company milestones through early 2026.
Key claims
Scale of operations
From main website (June 2025 figures):
| Metric | Value |
|---|---|
| Battery sites connected | 15,000+ |
| Battery capacity aggregated | 300+ MW |
| Nordic TSO pre-qualifications | 200+ |
| Wind turbines | 1,000+ MW / 300 sites |
| Solar power | 400+ MW / 20,000 sites |
| EV charging | 15+ MW / 50 sites |
| Flexible consumption | 10+ MW / 20 sites |
Active countries per main website: Sweden, Finland, Norway, Denmark, Poland. The About Us page (2026) focuses on Sweden and Finland for operational market delivery.
Specific milestone figures from About Us page:
- Summer 2024: ~100 MW FCR-D capacity (= 1/5 of total Swedish FCR-D procurement)
- Summer 2024: 10,000 sites connected (battery sites specifically)
- Early 2026: 15,000+ customers, 60 employees
Note: The “300+ MW” figure from the main website reflects total aggregated battery capacity; “100 MW FCR-D” is the volume contracted to the FCR-D market — a different metric.
Company profile
- Founded 2017, 60 employees, 15,000+ customers as of 2026.
- Described as “Nordens ledande oberoende aggregator” — the leading independent aggregator in the Nordics.
- B2B2C distribution: installations done by partner companies (electricians); revenue shared 10% CheckWatt + 10% installer/support, with the battery owner keeping the remainder.
Services and markets
Ancillary services delivered to TSOs (Svenska kraftnät in Sweden, Fingrid in Finland):
| Service | Status | Notes |
|---|---|---|
| FCR-D | Active (core product) | Reached 100 MW summer 2024 = 1/5 of Swedish market |
| FCR-N | Active | Residential prequalification started summer 2025 |
| mFRR | Active from May 2025 | First delivery with Bixia as BRP |
| FFR | Active (larger sites only) | Requires local frequency meter; not cost-effective for residential |
| aFRR | Not yet delivered | Barriers removed in Sweden 15 Jan 2025 (ombud model); not yet active as of early 2026 |
Local flexibility delivered to DSOs:
- Effekthandel Väst (Göteborg Energi Elnät + Mölndal Energi Elnät) — largest portfolio; ~500–1,000 batteries winter 2024/25–2025/26
- E.ON Switch (multiple zones) — ~400 battery systems, ~8 MW as of January 2026; active zones include Bålsta, Hässleholm, Kungsängen, Älmhult-Osby, Örebro, Södra Skåne; zero activations in Kalhäll and Bromölla-Sölvesborg in winter 2025/26
- Kinnekulle Energi (Götene) — small scale, direct agreement
- Stockholm Flex — first local flex delivery winter 2022/23 (300 kW battery); market since closed
~10% of Swedish CheckWatt customers live in areas where their DSO procures local flexibility.
FCR-N for residential: prequalification started summer 2025.
Peak shaving: pilot summer/fall 2025; not yet in production as of early 2026.
BRP/BSP market structure
- Sweden: CheckWatt must contract with the customer’s BRP to bid ancillary services. BRPs charge an additional 5–10% fee. This is the structural consequence of Sweden’s incomplete BSP role (see Aggregation › Nordic comparison: Sweden’s cross-BRP problem).
- Finland and Denmark: CheckWatt can register directly as a service provider to Fingrid / Energinet, bypassing the BRP intermediary. No BRP fee applies.
This structural difference contributes to the higher revenue multiplier in Finland (4.0×) vs Sweden (2.5×).
Platform and technology
- CM10: proprietary hardware gateway, installed by partner electrician (~1 hour). Connects battery inverter, energy meters, internet. Compatible with ~30 battery/inverter brands. Enables type qualification: newly connected residential systems begin FCR-D from day one.
- EnergyInBalance: web portal for customers — revenues, savings, system status, operating mode, electricity contract, grid tariff, meter/facility ID (anläggnings-ID, required for local flex).
- CheckWatt AI: AI forecasting and optimization for behind-meter services. Manages 20–45% of battery capacity for self-consumption + price arbitrage in parallel with ancillary service delivery; charging/discharging limited to ~1–2 kW for local services. Launched broadly February 2025.
Operating modes
| Mode | Purpose | Revenue sources |
|---|---|---|
| CheckWatt Optimized (recommended) | Maximize profitability — value stacking | Ancillary services + local flex + solar self-consumption + price arbitrage |
| CheckWatt Savings | Minimize electricity costs only | Solar self-consumption + price arbitrage; no ancillary services |
Previously named “Currently Optimized” and “Self Consumption” respectively. CheckWatt reports 2–3× higher returns from Optimized vs Savings over H1 2025 for a typical SE3 residential battery.
Revenue model
| Component | Value |
|---|---|
| Monthly fixed fee | €5/system excl. VAT |
| Performance fee | 20% of generated value |
| — CheckWatt share | 10% |
| — Installer/support share | 10% |
Approximate monthly revenues after all fees (Services page, recent period, FCR-D basis):
| Segment | Revenue |
|---|---|
| Residential (10 kW / 10 kWh) | ~482 SEK/month |
| Industry | ~12,240 SEK/month |
| Utility scale | ~49,140 SEK/month |
Multi-market performance (10 kW/10 kWh battery, January–June 2025): 2.5× vs basic price-arbitrage in SE3; 4.0× in Finland.
Local flex participation — winter 2025/26
Zone-level compensation for a 10 kWh battery — winter 2025/26 (from published chart, user-extracted):
| Market | Zone | Compensation (SEK) |
|---|---|---|
| Effekthandel Väst | Göteborg | 357 |
| Effekthandel Väst | Mölndal | 361 |
| E.ON Switch | Hässleholm | 1,810 |
| E.ON Switch | Bålsta | 2,703 |
| E.ON Switch | Älmhult-Osby | 2,075 |
| E.ON Switch | Kungsängen | 1,645 |
| E.ON Switch | Örebro | 848 |
| E.ON Switch | Södra Skåne | 600 |
Zones with zero activations: Kalhäll and Bromölla-Sölvesborg (E.ON Switch). Bålsta activated 100+ hours; Göteborg/Mölndal 2–20 hours.
Winter 2024/25 outcomes (prior season)
- Effekthandel Väst: 500+ batteries, 7.6 MW, ~14 activations (Göteborg) / ~8 (Mölndal). Gross ~930 SEK / net ~740 SEK for 10 kW battery (after 20% fee). Combined with FCR-D: ~1,800 SEK for the 3-month season vs ~1,100 SEK for FCR-D alone.
Market transition events
- 1 October 2025: Swedish electricity market transitioned to 15-minute quarter-hour prices. CheckWatt updated battery control to use quarter prices in newer firmware; older firmware rolls up to hourly averages during staged rollout.
- 1 January 2026: Swedish 60 öre/kWh solar export tax credit (skattereduktion) removed. CheckWatt AI adjusted to value self-consumption ~50 öre/kWh higher relative to selling to grid.
Company milestones
| Year | Milestone |
|---|---|
| 2017 | Founded |
| Summer 2022 | First ancillary service: FFR (200 kW battery) |
| November 2022 | First FCR-D (1 MW minimum bid reached) |
| Winter 2022/23 | First local flex (Stockholm Flex, 300 kW) |
| October 2023 | 1,000 batteries connected |
| November 2023 | E-Prize innovation award (Aktuell Hållbarhet / DI / E.ON) |
| Summer 2024 | 100 MW FCR-D (1/5 of Swedish market); 10,000 sites connected |
| Winter 2024/25 | First residential local flex (Effekthandel Väst, 500+ batteries) |
| February 2025 | CheckWatt AI launched broadly |
| 2025 | First Finland deliveries (Solarvoima: FCR-N 200 kW; then FCR-D from 200 households) |
| May 2025 | First mFRR delivery (with Bixia as BRP) |
| October 2025 | Transition to 15-minute quarter-hour pricing in battery control |
Corporate event — failed Emaldo acquisition
A planned acquisition of CheckWatt by Emaldo Group did not proceed after ~9 months of regulatory review: necessary approvals were not obtained. CheckWatt remains independent. Commercial partnership continues: Emaldo batteries are connected via the CheckWatt platform.
Relevance to wiki
Primary source for CheckWatt entity page. Key inputs to: Aggregation (BRP intermediary, mFRR for batteries, aFRR ombud change, fee structure), Balancing Markets (aFRR access), Effekthandel Väst (winter 2025/26 zone revenues, activation data), Virtual Power Plant (operating detail), The Flexibility Provider Base — Structure, Barriers, and the Aggregator Constraint, Energy Storage (residential BESS aggregation at scale).
Data gaps
- CheckWatt’s Sweden-specific BESS installation count (15,000+ is likely mostly Swedish but Nordic-wide; Finnish household share unknown)
- Revenue breakdown by service type (what share from FCR-D vs FCR-N vs mFRR vs local flex vs behind-meter)
- CheckWatt’s aFRR delivery timeline — when after Jan 2025 ombud opening?
- Denmark and Norway market — mentioned in main website scale figures but no delivery details provided