Gets one day's electricity prices for a market as hourly averages (normally 24 rows; 23 or 25 on daylight-saving change days), with the day's min, max and average and the cheapest/most expensive hour. Days are day-ahead delivery days in Central European time (Europe/Amsterdam, CET/CEST); hour starts are given in that local time. Prices are per kWh in the market's own currency. Tomorrow's prices are published around 13:00 CET each day; before that, asking for "tomorrow" returns a not-yet-published message. All-in = variable household price per kWh: spot + energy tax + per-kWh grid fee + VAT. Fixed monthly charges (grid capacity, tax credits) are excluded. Spot = wholesale day-ahead price.