Commercial solar installation: Commercial Solar Price Index

Every row is a verbatim sentence read from the named source's own page through our fetch service on the date shown, hash-pinned to the stored read (the sha of the page's visible text; the raw page is mirrored to R2).

7 of the 33 named sources that could be read published a usable figure; 26 published none and are recorded as not published, never filled in; 2 could not be read (blocked, dead or unreachable) and count nowhere.

The headline figures (median, minimum, maximum, quartiles) are over ONE figure per source for each breakdown it prices, in GBP (a source's median where its page yielded several accepted sentences for one breakdown), so a page that gives figures for several breakdowns gives one for each and N counts 8 figures, never sentences; 415 candidate sentence(s) were refused by a reviewer with the reason recorded.

The fuller derivation this dataset is chartered to grow into (not yet what the figures above are; they are each source's own published figure as read): the published-price index in the unit the market actually quotes: median, minimum and maximum £/kWp installed by system-size band (sub-30kWp, 30-100, 100-250, 250-500, 500kWp-1MW), £ per panel cleaned by array size, £ per maintenance visit and per kW per year on an O&M contract, £ per inverter replaced, and £/kWh for battery beside it - across every UK provider publishing a number, with the count and SHARE publishing versus quote-only, the size-discount curve measured rather than asserted, and the PAYBACK computed by joining £/kWp to the SEG export rate and the business electricity price so 'solar payback period' has an arithmetic answer rather than an anecdote; the US-state rows (FL, GA) are held on the same axis in $/W from US installers' own pages

415 candidate sentences on these pages were refused by a reviewer; each refusal and its reason is recorded in the review ledger.