Fuse Energy

Fuse Energy (originally launched as Tesseract) is a UK-based, vertically integrated energy supplier founded by former Revolut executives Alan Chang and Charles Orr. It buys power from generators and supplies gas and electricity directly to residential and business customers, positioning itself to beat the UK price cap with variable, fixed and multi-rate tariffs, 30-minute billing updates, EV charging, solar/battery export tracking and an in-app AI assistant called "Plugs." The company raised $78M led by Balderton Capital and Lakestar. Surfaced in the API Evangelist network as a portfolio-company lead; as of this enrichment pass Fuse Energy publishes only a consumer-facing web and mobile app and no public developer API, SDK, or documentation.

Fuse Energy is profiled on the APIs.io network. Tagged areas include Company, Energy, Energy Supplier, Electricity, and Gas.

Fuse Energy’s developer surface includes engineering blog, support, signup flow, and 5 more developer resources.

🌐 Visit website 📡 Source on GitHub
9.1/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0
0 APIs
CompanyEnergyEnergy SupplierElectricityGasEV ChargingClimate TechUnited KingdomConsumer

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0
Composite quality — 9.1/100 · minimal
Contract Quality 0.0 / 21
Developer Ergonomics 1.2 / 17
Access Clarity 4.0 / 17
Operational Transparency 0.0 / 11
Contract Governance 0.0 / 10
Discoverability 4.3 / 9
Regulatory Posture 0.8 / 15
Agent readiness — 0/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Regulatory Posture applies to this provider. Its tags matched the Energy & Utilities regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/tesseractenergy: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp
SignUp

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 1

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService

Company 4

The organization behind the API

Website
Website
 Blog
Blog
 Careers
Careers
 LinkedIn
LinkedIn

Other 1

Properties that don't map to a standard resource type

X
X

Source (apis.yml)

apis.yml Raw ↑ 
aid: tesseractenergy
name: Fuse Energy
description: Fuse Energy (originally launched as Tesseract) is a UK-based, vertically integrated energy supplier founded by
  former Revolut executives Alan Chang and Charles Orr. It buys power from generators and supplies gas and electricity directly
  to residential and business customers, positioning itself to beat the UK price cap with variable, fixed and multi-rate tariffs,
  30-minute billing updates, EV charging, solar/battery export tracking and an in-app AI assistant called "Plugs." The company
  raised $78M led by Balderton Capital and Lakestar. Surfaced in the API Evangelist network as a portfolio-company lead; as
  of this enrichment pass Fuse Energy publishes only a consumer-facing web and mobile app and no public developer API, SDK,
  or documentation.
url: https://raw.githubusercontent.com/api-evangelist/tesseractenergy/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- balderton-capital
x-tier: stub
x-tier-reason: portfolio-lead
x-rebrand:
  former-name: Tesseract
  former-url: https://www.tesseractenergy.xyz/
  current-name: Fuse Energy
  current-url: https://www.fuseenergy.com/
  note: tesseractenergy.xyz 301-redirects to fuseenergy.com
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
image: https://static.fuseenergy.com/assets/preview/spaced-logo.png
tags:
- Company
- Energy
- Energy Supplier
- Electricity
- Gas
- EV Charging
- Climate Tech
- United Kingdom
- Consumer
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.fuseenergy.com/
- type: Blog
  url: https://www.fuseenergy.com/blog
- type: Support
  url: https://www.fuseenergy.com/support
- type: TermsOfService
  url: https://www.fuseenergy.com/legal
- type: SignUp
  url: https://www.fuseenergy.com/app/boarding
- type: Careers
  url: https://apply.workable.com/fuseenergy/
- type: X
  url: https://x.com/fuseenergy
- type: LinkedIn
  url: https://www.linkedin.com/company/fuseenergyhq
x-enrichment:
  date: '2026-07-21'
  status: minimal
  artifacts_added: 0
  pass: local-v1