Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 1 Complete, well-documented, and agent-ready

Google Solar APIThe Google Solar API delivers solar potential data for buildings, including rooftop geometry, shading, sunl...70.1

Strong 1 Solid coverage with minor gaps

Enphase Enlighten Commissioning APIThe Commissioning API is the installer-facing companion to the Monitoring API. Available to Partner-plan cu...63.8

Developing 10 Usable, with meaningful gaps to close

PlantPredict MCP ConnectorHosted Model Context Protocol server that lets Claude, ChatGPT and Cursor act on a user's own PlantPredict ...53.1 Terrain Pro APITerabase Energy's terrain analysis and solar site-planning API, used by the Terrain Pro application for ele...53.1 ev.energy Solar APIEndpoints for interacting with solar arrays and inverters.52.2 Solar APIAccess solar potential data for hundreds of millions of buildings worldwide including building insights and...50.9 Con Edison Hosting Capacity Map REST APICon Edison's distribution-grid open data, published as anonymously readable Esri ArcGIS REST feature servic...45.2 NREL/NLR Developer Network APIsThe National Renewable Energy Laboratory (NREL, transitioning to NLR) Developer Network publishes a portfol...44.3 Reposit Power Solar APIThe solar API from Reposit Power — 2 operation(s) for solar.44.1 Sense Realtime APIThe Sense Realtime API delivers live electricity usage data via a WebSocket connection, streaming second-by...42.6 Stormglass Solar APISolar radiation and UV index data40.8 Space Weather Prediction Center (SWPC) Data ServiceSWPC publishes solar wind, geomagnetic, X-ray flux, aurora forecast, radiation storm, and coronal mass ejec...40.4

Thin 9 Limited public surface area

BPA Wind and Solar Generation DataBPA publishes real-time and historical wind and solar generation data for the Balancing Authority area. Dat...37.2 ESA Space Weather HAPI ServerHeliophysics Application Programmer's Interface (HAPI) server providing access to ESA Space Weather Service...30.7 1KOMMA5° Heartbeat APIThe Heartbeat API is the customer-facing energy API behind the 1KOMMA5° mobile apps and the Heartbeat AI pl...29.0 Essential Energy Hosting Capacity Feature ServicesAnonymous ArcGIS REST FeatureServer endpoints publishing Essential Energy's distributed energy resource hos...28.2 Jemena CSIP-AUS Utility Server (IEEE 2030.5)Jemena Electricity Networks' CSIP-AUS compliant control server — an IEEE 2030.5 (Smart Energy Profile 2.0) ...28.1 National Renewable Energy Laboratory Solar APIThe Solar API from National Renewable Energy Laboratory — 1 operation(s) for solar.27.7 PVWattsEstimate the energy production and cost of grid-connected photovoltaic energy systems for any location.27.7 Solar Resource DataAverage direct normal, global horizontal, and tilt at latitude irradiance for a US location.27.7 ENMAX Power System Capacity ArcGIS Feature ServicesThe machine-readable grid data behind ENMAX Power's public Hosting Capacity, Load Capacity and Service Area...26.8

Emerging 1 Early or largely undocumented

Growatt Open API V1Token-authenticated REST API for the Growatt ShineServer monitoring platform. Exposes plant lists and detai...12.2

Minimal 1 Almost no public developer surface

Mosaic Financing APIThe Mosaic Financing API is the integration surface Solar Mosaic published for its solar installer, dealer ...0.0

Companies reaching this through an API (6)

These companies publish an API, specification or operation carrying “Solar” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Bonneville Power Administration Essential Energy European Space Agency (ESA) Google National Renewable Energy Laboratory NOAA — National Oceanic and Atmospheric Administration

Score breakdown

Frequency

59.5

log-scaled weighted occurrences

Breadth

3.2

spread across providers

Quality lift

26.4

mean composite of providers using it

Cohesion

15.2

strength of nearest seed neighbor

Where this tag sits

124 providers carry this tag directly, and 127 counting the 1 narrower tag below — 3 more to reach.

Photovoltaics 24 providers

Where this tag comes from

Provider tag124

Api tag23

Openapi tag3

Openapi op tag4

Cohort brief

Auto-generated

The 113 providers in the APIs.io catalog tagged Solar, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

113

all scored

Mean Kin Score

+0.1 vs catalog 22.9

Mean Agent Readiness

11.9

even vs catalog 11.9

Spread

0–63.8

median 13.8 · σ 17.7

How the 113 split by band

Exemplar 0Strong 4Developing 25Thin 12Emerging 33Minimal 39

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Contract Quality	18	17.6	+0.4	113
Discoverability	58	58.1	-0.1	113
Developer Ergonomics	23.1	23.2	-0.1	113
Contract Governance	5.9	6.3	-0.4	113
Access Clarity	25.7	26.5	-0.8	113
Operational Transparency	12.8	13.7	-0.9	113

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes

Artifact	This cohort	Catalog	Difference
MCP server (any)	6%	14%	-8
MCP server (first-party)	4%	12%	-8
Agent Skills	0%	0%	0
OAuth scopes	17%	11%	+6
Security	99%	98%	+1
Arazzo workflows	4%	2%	+2
Governance rules	13%	14%	-1

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score

1 Enphase Energy 63.8
2 OpenWeatherMap 61.9
3 Tesla Energy 55.8
4 Coperniq 55.4
5 Origin Energy 53.7
6 Terabase Energy 53.1
7 Solcast 52.8
8 SolarEdge 52.7
9 ev.energy 52.2
10 Octopus Energy 51.6

Work with this as data

Every tag here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for tags

7 MCP tools reach this

find_tagsBrowse and filter every tag in the catalog.
get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This tag

curl "https://apis.io/api/v1/tags/solar"

All tags

curl "https://apis.io/api/v1/tags?limit=25"

As a scored cohort

curl "https://apis.io/api/v1/cohorts/tag/solar"

The distribution (Pro)

curl "https://apis.io/api/v1/cohorts/tag/solar/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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Solar

Providers using this tag (124)

APIs with this tag (23)