Updated March 2026 — The Energym RE:GEN is an indoor fitness bike that converts your pedaling power into clean, usable electricity stored in a removable battery pack. It is a genuinely innovative concept that lets you charge your devices with energy generated from your own workouts.
- Indoor exercise bike with built-in power generator and removable 90Wh OHM battery pack
- Priced at £2,249 (approximately $2,800 USD) — premium but unique in the fitness market
- Generates enough power per workout to fully charge the OHM, which can charge a MacBook Pro nearly 3 times
- Zwift-compatible, AI-controlled digital resistance, and app integration for workout tracking
Energym RE:GEN Overview
The Energym RE:GEN was developed by Energym, a UK-based company that spent over two years creating the bike in partnership with leading British universities. Originally launched through a successful Indiegogo crowdfunding campaign in 2021, the RE:GEN is now a full retail product shipping worldwide to the UK, EU, USA, and Canada.
The core concept is simple: every time you pedal, the bike captures your mechanical energy and converts it into electricity stored in a removable battery called the OHM. After your workout, unclip the OHM and use it to charge your phone, laptop, tablet, or any USB-C device — powered entirely by your own effort.
This is not just a gimmick bolted onto a cheap bike. The RE:GEN is a serious indoor cycling platform with digital resistance control, Zwift compatibility, SPD pedals, and a full workout app ecosystem. It happens to also generate power — and that makes it unlike anything else on the market.
Key Features and Specifications
| Price | £2,249 (~$2,800 USD) |
| OHM Battery | 90Wh Li-Ion, 1 kg (2.2 lbs), removable |
| OHM Ports | 2x USB-C with 60W Power Delivery |
| Bike Weight | 55 kg (120 lbs) |
| Flywheel | 17 kg (37.5 lbs) |
| Max User Weight | 150 kg (330 lbs) |
| User Height Range | 147 – 196 cm (4’10” – 6’5″) |
| Footprint | 120 x 56 cm (3’9″ x 1’8″) |
| Power Accuracy | ±5% |
| Connectivity | Bluetooth Low Energy (BLE), Zwift compatible |
The OHM Battery Pack
The OHM is the heart of the RE:GEN system. This removable 90Wh lithium-ion battery pack weighs just 1 kilogram and measures 20 x 8.5 cm — roughly the size of a water bottle. It clips into a dock on the front of the bike during your workout and captures the electrical energy generated by your pedaling.
An average workout session generates between 170Wh and 230Wh of energy, which is more than enough to fully charge the 90Wh OHM. Once charged, the OHM provides 2x USB-C ports with 60W Power Delivery — enough to fast-charge a MacBook Pro nearly three times, an iPhone about ten times, or an iPad Pro around four times.
The OHM also features a built-in color-coded FTP (Functional Threshold Power) display with five zones, giving you real-time visual feedback on your training intensity right on the battery unit itself. It also supports 60W fast charging from a standard wall outlet if you need to top it up between workouts.
Ride Quality and Smart Features
The RE:GEN is built on a welded carbon steel frame with a 17 kg flywheel for smooth, consistent pedaling. The AI-controlled digital resistance system uses button-based gear shifters to adjust resistance levels automatically, eliminating the need for manual knob adjustments.
The bike connects to the Energym app via Bluetooth Low Energy for structured workouts, FTP ramp testing, energy tracking, and calorie monitoring. It is also fully compatible with Zwift and other third-party cycling apps. Dual-sided pedals support both standard training shoes and SPD clips for serious cyclists.
Comfort features include 4-way adjustable handlebars and saddle (vertical and horizontal), a 360-degree swivel tablet/phone holder, and an eco-comfort performance saddle. The frame itself is made from recycled steel alloy with eco-plastic components — an environmentally conscious design choice that fits the product’s clean-energy ethos.
Pros and Cons
What We Like
- Truly generates usable electricity — charge real devices from the power of your workouts
- Quality fitness platform — Zwift-compatible, digital resistance, SPD pedals, and app integration
- No power outlet needed — the bike operates completely off-grid with no external power
- Portable OHM battery — lightweight, USB-C PD output, real-world utility beyond the bike
- Eco-friendly construction — recycled steel alloy and eco-plastic components
What Could Be Better
- Premium price — at £2,249 (~$2,800), it costs more than most smart indoor bikes
- Heavy frame — 55 kg (120 lbs) makes it difficult to move once placed
- Energy generation is modest — a full workout session charges the equivalent of a small power bank, not a household
- Limited third-party reviews — fewer independent reviews compared to mainstream smart bikes from Peloton or Wahoo
Alternatives Worth Considering
There are very few direct competitors to the RE:GEN because most smart bikes do not generate electricity. Pedal Power generators (from PedalPowerGenerator.com) offer DIY-style bike generator setups starting around $2,600, but they lack the polished app integration and modern smart bike features.
If power generation is not a priority and you just want a great smart bike, the Wahoo KICKR Bike and Peloton Bike+ are well-established alternatives in a similar price range with larger content libraries and user communities.
Who Should Buy This?
The Energym RE:GEN is perfectly suited for eco-conscious fitness enthusiasts who want their workout to produce something tangible beyond calories burned. It is an excellent choice for off-grid homes, sustainability-focused households, and anyone fascinated by the idea of human-powered electricity.
It also appeals to serious indoor cyclists who want Zwift compatibility and a quality ride experience but with the added bonus of generating clean power. If you are looking for a unique conversation piece that actually works and delivers genuine utility, the RE:GEN stands alone in its category.
Final Verdict
The Energym RE:GEN is one of the most innovative fitness products we have seen. It is a legitimate smart indoor bike with a genuinely useful power-generation feature. At £2,249 it demands a premium, but for riders who value sustainability and want their workouts to power their devices, it is a compelling and one-of-a-kind investment.
Frequently Asked Questions
An average workout session generates between 170Wh and 230Wh of energy. This is enough to fully charge the 90Wh OHM battery pack, which can then charge a MacBook Pro nearly 3 times, an iPhone about 10 times, or an iPad Pro around 4 times.
No. The RE:GEN is designed to charge small electronic devices via its portable OHM battery pack, not to supply household electricity. A typical workout generates around 200Wh, which is enough on a practical level for charging phones, laptops, and tablets — not powering appliances.
The OHM has two USB-C ports with 60W Power Delivery, so it can charge any USB-C device including laptops, smartphones, tablets, smartwatches, wireless earbuds, portable speakers, and cameras. It can also be charged itself via a wall outlet when needed.
Yes. The RE:GEN connects via Bluetooth Low Energy (BLE) and is fully compatible with Zwift and other third-party cycling apps. It transmits power data with ±5% accuracy for a realistic virtual riding experience.
The RE:GEN is priced at £2,249 (approximately $2,800 USD). You can reserve one with a £100 deposit and pay the remaining £2,149 balance when it is ready to ship. Delivery is estimated at 4-6 weeks from order. Shipping is free in the UK, with £139 for EU delivery.
No. The RE:GEN operates completely independently of external power. It generates its own electricity from your pedaling, so it does not need to be plugged in. The OHM battery can optionally be charged from a wall outlet, but the bike itself requires no socket.
The RE:GEN has a footprint of 120 x 56 cm (approximately 3 feet 9 inches by 1 foot 8 inches), which is similar to most indoor exercise bikes. It weighs 55 kg (120 lbs), so it is quite heavy but stable. It can accommodate riders from 147 cm to 196 cm (4 feet 10 inches to 6 feet 5 inches) tall.
Robert DeWitt writes and tests off-grid power gear for Off Grid Power Boom. Based in Arizona, he uses portable power stations, solar panels, and battery systems regularly in extreme heat—focusing on practical runtime, charging speed, reliability, and real-world usability for camping, RV trips, and home backup.
Editorial focus: portable power stations & solar generators, solar panel setups, batteries/inverters, and off-grid preparedness.