Helios
Helios is a free UK address-level calculator that answers one question: is plug-in solar worth it for your home? Enter a postcode, and it ray-traces the surrounding buildings using Environment Agency LIDAR data to estimate real shading, then queries the EU PVGIS API for an annual yield figure.
South London Scientific's Helios launched on 30 May 2026 — days after BS 7671 Amendment 4 made 800 W plug-in solar kits legal in Britain on 15 April 2026. The tool accounts for your electricity tariff and the Smart Export Guarantee rules to output a personalised payback period and 20-year net saving.
Think of it as a sat-nav for sunlight — it checks what's in the way before telling you whether to bother.
Search Interest
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Nascent ← now0–7 days
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Emergent8–30 days
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Validating31–90 days
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Rising91–180 days
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Established180 days +
Why is it emerging now?
Plug-in solar became legal in Great Britain on 15 April 2026 under BS 7671 Amendment 4, opening a renter-accessible solar market for the first time. Helios launched two weeks later as the first address-level feasibility tool that uses real LIDAR shading data — a gap no existing UK solar calculator had filled.
Outlook
6-month signal projection and commercial timeline.
Regulatory tailwind is real, but tool is a solo weekend project; commercial longevity depends on open-sourcing or kit-market affiliate pivot.
Risk · Niche product-safety standard delay past July 2026 would slow kit demand and tool relevance.
Analogs · gov.uk open data · PVGIS · HeliosHome
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nowFree tool, affiliate gap open
No comparable LIDAR-backed UK tool exists; affiliate or lead-gen to kit retailers is the obvious first path.
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3-6moKit market goes live
BSI product standard (expected July 2026) unlocks certified kit sales; comparison and affiliate pages gain search volume.
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6-12moInternational port opportunity
HN community asked for Canada and Australia adapters; open-source release could attract forks and sponsorship.
Competition & Opportunity for term “Helios”
Three heuristic signals derived from the tracked queries, the term's monetization cards, and its cluster neighbors. Directional, not audited.
Ideas for term “Helios”
Buildable pitches — turn this term into an article, site, product, post, newsletter, video, or course. Steal any card and run with it.
Regional analysis using Helios data. Southfacing terraces in SE England vs Scotland fallback zones — data-driven SEO piece targeting 'is solar worth it UK' queries.
Comparison article positioning plug-in (Helios) against full-rooftop estimators (HeliosHome, MCS calculators). Monetise via affiliate links to kit sellers.
Evergreen explainer for 'plug-in solar UK 2026' — a query with fast-growing commercial intent as kits reach retail shelves.
Thin service that calls Helios-style endpoints and returns solar score for a given postcode/uprn. Embeddable widget for Rightmove/Zoopla clones.
HN thread showed direct demand; each country has a public LIDAR programme. Multi-territory tool could anchor a broader 'is solar worth it' brand.
Directory of certified plug-in kits, installer quotes, and tariff comparisons. Ranks for 'best plug-in solar UK' as the product market matures.
First-person walkthrough with screenshots. Strong shareability on UK sustainability communities and LinkedIn homeowner groups.
Germany normalised plug-in solar years ago. Britain just made it legal in April 2026. Now a London indie developer has shipped the first address-level calculator — and it uses government LIDAR to model your actual skyline.
77 HN points in six hours for a geospatial solar tool tells you the demand is real — British renters have been locked out of solar for years.
A working solar yield estimator for every British address, built by one person using three public datasets and a free EU API — this is what civic tech looks like.
What People Search
Long-tail queries from Google Suggest + Trends. Volume and competition are heuristics — directional, not audited. Content Type comes from query shape.
SERP of term “Helios”
What searchers see today — organic results on top, paid ads if anyone's bidding. Ad density is a real-time commercial signal.
FAQ
What is Helios?
Helios is a free UK address-level calculator that answers one question: is plug-in solar worth it for your home?.
Why is Helios emerging now?
Plug-in solar became legal in Great Britain on 15 April 2026 under BS 7671 Amendment 4, opening a renter-accessible solar market for the first time. Helios launched two weeks later as the first address-level feasibility tool that uses real LIDAR shading data — a gap no existing UK solar calculator had filled.
When did Helios emerge?
Publicly emerged around 2026-05-30 (about 4 days ago as of 2026-06-03). EarlyTerms first recorded a pipeline signal on 2026-05-30.
Related Terms
Other terms in the same space — aliases, subtypes, competitors, and neighbors to explore next.
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Sources
Primary URLs this report cites — open any to verify the claim yourself.
- 01 Helios — official tool (South London Scientific) helios.southlondonscientific.com ↗
- 02 Show HN: Helios — what plug-in solar could generate for any address in Britain (77 pts) news.ycombinator.com ↗
- 03 UKEM Group: Plug-in solar legalised in UK — 800W from 15 April 2026 ukem.co.uk ↗
- 04 Plug-in Solar Explained: UK regulations, kit requirements, and installation guide pluginsolarexplained.co.uk ↗
- 05 PVGIS — European Commission photovoltaic yield API joint-research-centre.ec.europa.eu ↗