UK Electricity Price Slots

Cheapest half-hour UK electricity slots by postcode — best windows for EV charging, heat pumps, batteries and power-hungry jobs.

For EV fleets, home-battery/solar owners, small manufacturers, bakeries, crypto/AI rigs and energy-automation builders. Free: cheapest 3 upcoming slots. Subscribers get best N-hour windows with £ cost, export prices and 30-day averages in their AI agent.

Tools

• cheapest_slots (free) — FREE. Cheapest 3 upcoming half-hour electricity slots (Agile Octopus, p/kWh inc VAT) for a UK postcode's region.
• best_window (Pro) — PRO. Cheapest continuous window of N hours in the upcoming prices (EV charging, heat pumps, batteries, industrial jobs) with average price and cost for a kWh amount.
• all_slots (Pro) — PRO. All published half-hourly import prices for today/tomorrow for a postcode region.
• export_rates (Pro) — PRO. Agile Outgoing export prices — best upcoming slots to sell solar/battery power.
• daily_average (Pro) — PRO. Daily average/min/max Agile import price for the last N days (max 30) — for budgeting and tariff comparison.

Live free example

cheapest_slots {"postcode":"M1 1AE"}

{
  "postcode": "M1 1AE",
  "region": "G",
  "upcoming_slots": 55,
  "cheapest_3": [
    {
      "from": "2026-10-15T13:30:00Z",
      "to": "2026-10-15T14:00:00Z",
      "p_per_kwh_inc_vat": 20.18,
      "london_time": "15 Oct, 14:30"
    },
    {
      "from": "2026-10-15T11:30:00Z",
      "to": "2026-10-15T12:00:00Z",
      "p_per_kwh_inc_vat": 20.26,
      "london_time": "15 Oct, 12:30"
    },
    {
      "from": "2026-10-15T13:00:00Z",
      "to": "2026-10-15T13:30:00Z",
      "p_per_kwh_inc_vat": 20.35,
      "london_time": "15 Oct, 14:00"
    }
  ],
  "pro": "Best N-hour window for EV charging/heating/batch jobs, export prices and 30-day averages: https://uk-energy-prices-mcp.donniertf.workers.dev/buy",
  "disclaimer": "Agile rates are Octopus Energy's published half-hourly tariff prices (inc VAT) — a good proxy for day-ahead wholesale, but your own tariff may differ. Tomorrow's prices usually publish around 4pm UK time. Not financial advice."
}

Connect (MCP)

Add https://uk-energy-prices-mcp.donniertf.workers.dev/mcp to Claude, Cursor or any MCP client (Streamable HTTP, no login for the free tier). Subscribers pass access_token or Authorization: Bearer.

Important

Agile rates are Octopus Energy's published half-hourly tariff prices (inc VAT) — a good proxy for day-ahead wholesale, but your own tariff may differ. Tomorrow's prices usually publish around 4pm UK time. Not financial advice.

Data sources & licences

• Octopus Energy public API — Agile Octopus half-hourly import/export unit rates by region (no account needed)

For AI agents

llms.txt · server card · pricing.json · POST /checkout → checkout URL · GET /token?session_id= → access token.

More UK data MCPs

See the whole fleet (Companies House, Land Registry, planning, tenders and more), plus the £1.99 / £3.99 pack bundles: bundles · GitHub hub.

Contact & cancelling

Questions, refunds or cancelling: dmorrisonwebdesign@gmail.com. Run by Donnie Morrison, UK. Payments by Stripe; we never see card details.