EnergyPro — Grid & Solar Intelligence

Energy Dashboard

Overview for Portugal · €0.21/kWh

Monthly Bill

€62

after solar credits

Solar Savings

€38

estimated / month

Self-Sufficiency

41%

grid reliance: 59%

CO₂ Offset

1.2t

tonnes / year

EV Cost/100km

€3.15

home charging

Annual ROI

8.2%

~3.4 yr payback

Energy flow — today

Solar direct use8.2 kWh

Battery discharge3.4 kWh

Grid import3.4 kWh

Solar export1.8 kWh

Quick settings

Monthly grid usage (kWh)

450 kWh

Solar panels (400W each)

10 × 400W

Battery storage (kWh)

5.0 kWh

EV battery capacity (kWh)

75 kWh

12-month projection

Solar System Designer

Size your system, estimate generation, and calculate ROI

System parameters

Panel count

10 panels

System size: 4.0 kWp

Panel wattage

400 W

Battery storage

5.0 kWh

Daily consumption (kWh)

15.0 kWh

Financials

Import rate (per kWh)

Feed-in / export rate (per kWh)

Portugal SERUP rate ≈ €0.06–0.10/kWh

Estimated system cost (€)

~€1,800–2,200 per kWp installed

Annual degradation (%)

0.5%

Daily generation

7.0 kWh

avg today

Self-sufficiency

47%

of daily load

Monthly saving

€38

net of exports

Payback period

8.2 yr

~€0 after

Monthly generation profile

25-year financial projection

25-yr savings

€18,400

Break-even year

Yr 9

Seasonal generation breakdown

EV Charging Calculator

Analyse session costs at public, fast, and ultra-rapid chargers

Your vehicle & session

Vehicle battery capacity (kWh)

75 kWh

Tesla Model Y Long Range ≈ 75 kWh · Model 3 SR ≈ 54 kWh

Start state of charge (%)

28%

End state of charge (%)

86%

Vehicle max AC charge rate (kW)

11.0 kW

Vehicle max DC charge rate (kW)

170 kW

Efficiency (km per kWh)

6.5 km/kWh

Real session analyser

Enter the cost and duration of a real charge to reverse-engineer the per-kWh rate.

Session cost (€)

Duration (min)

Currency

kWh added

43.5

Avg rate paid

€0.529

Avg charger power

37.3 kW

This rate is 2.5× higher than home charging — consider off-peak home charging where possible.

Range added

283 km

at selected efficiency

Cost per 100 km

€8.13

this session rate

vs home charge

+€15.4

extra cost this session

vs petrol (8L/100)

−€18

saving vs ICE

Charger speed comparison — same session (28% → 86%)

Note: Charge times shown assume the charger can deliver full rated power and your vehicle accepts it. Real DC fast charging curves taper above ~80% SoC. Ultra-rapid times are theoretical minimums — actual acceptance depends on battery temperature and vehicle onboard charger limits.

Full charge cost comparison (0% → 100%)

Tariff Rate Analyser

Compare flat, bi-hourly, time-of-use, and dynamic tariffs to find your best plan

Flat rate settings

Unit rate (per kWh)

Portugal 2024 regulated rate ≈ €0.2136/kWh

Standing charge (per day)

Monthly usage (kWh)

350 kWh

Monthly bill

€85.3

Annual cost

€1,024

Cost/kWh incl.

€0.244

Flat rate pros & cons

✓	Simple, predictable monthly bills
✓	No need to shift loads to off-peak
✓	Best if usage is spread evenly through the day
✗	Cannot benefit from off-peak discounts
✗	Often more expensive than bi-horária for EV owners
✗	Rate changes annually with regulated tariff

Best for: Small apartments, retired/home-based users with steady consumption throughout the day.

Bi-hourária — day & night rates

Portugal: Vazio (off-peak) 22:00–08:00 weekdays; cheaper at weekends too. Fora de Vazio (peak) rest of the time.

Peak rate — Fora de Vazio (kWh)

Off-peak rate — Vazio (kWh)

Off-peak is ~46% cheaper in regulated tariff 2024

Standing charge (per day)

% usage in off-peak hours

45%

EV charging overnight boosts this significantly

Monthly usage (kWh)

350 kWh

Monthly bill

€78.4

vs flat rate

−€6.9

EV night cost

€9.6

full charge (75kWh)

24h tariff visualisation

Peak (Fora de Vazio)

Off-peak (Vazio)

Tips to maximise savings

✓	Schedule EV charging 22:00–07:00
✓	Run dishwasher & washing machine at night
✓	Pre-heat/cool home before 22:00 using stored heat
✓	Charge battery storage from grid at off-peak rate
!	Charging between 09:00–21:00 costs more than flat

Time-of-use — 3-period (tri-horária)

Three distinct price bands: peak, shoulder, and off-peak (super off-peak). Common in Spain, UK Octopus, and EDP tri-horária Portugal.

Peak rate (e.g. 09:00–12:00 & 18:00–21:00)

Shoulder rate (e.g. 08:00–09:00 & 12:00–18:00)

Off-peak rate (e.g. 21:00–08:00)

% usage — peak hours

25%

% usage — shoulder hours

35%

Monthly usage (kWh)

350 kWh

Monthly bill

€76.1

vs flat rate

−€9.2

Blended rate

€0.196

24h rate visualisation

Peak

Shoulder

Off-peak

Optimisation strategy

Moving just 50 kWh/month from peak to off-peak saves €8.6/month.

Period	Hours/day	Rate	Best actions
Peak	5h	€0.290	Avoid heavy loads
Shoulder	8h	€0.195	Normal use OK
Off-peak	11h	€0.118	EV, laundry, dishwasher

Dynamic / SPOT pricing

Price tracks the day-ahead wholesale electricity market (OMIE for Iberia, N2EX for UK). Rates can go negative overnight or spike during demand peaks.

Markup above SPOT (per kWh)

Supplier margin + grid fees. EDP e.go / Octopus Agile typical markup

Estimated avg SPOT price (per kWh)

OMIE Iberian average ~€0.06–0.12/kWh (2024)

Smart charging % (automated off-peak)

60%

Higher = more load shifted to cheapest hours automatically

Monthly usage (kWh)

350 kWh

Est. monthly bill

€51.7

vs flat rate

−€33.6

Blended rate

€0.148

Simulated 24h SPOT price curve

Risk: Prices spike during demand events (cold snaps, low wind). Without smart controls, bills can be unpredictable. A price cap or hybrid tariff may suit you better.

Opportunity: With an EV and battery storage, a smart energy system can buy cheap energy at night and use/sell it during peak times — often below €0.05/kWh effective cost.

Side-by-side tariff comparison

Flat Rate

€85/mo

Simple, predictable

Low effort

Bi-hourária

€78/mo

Good for EVs & night-owls

Recommended

Time-of-Use

€76/mo

Best with smart controls

Medium effort

Dynamic SPOT

€52/mo

Max savings, max effort

Advanced

AI Energy Advisor

Answer a few questions about your bills and habits — get a personalised efficiency report

Powered by Workers AI — Llama 3.1 8B

Enter your last 3 electricity bills and some details about your home. The AI analyses your real numbers and produces specific savings recommendations — not generic advice. Runs entirely on Cloudflare's edge, no third-party AI APIs required.

1

Bills

2

Your Home

3

Appliances

4

Results

Your tariff

Tariff type

Peak rate (per kWh)

Off-peak rate (per kWh)

Portugal Vazio: 22:00–08:00 · UK Economy 7: 00:30–07:30

Standing / daily charge

Does your meter show peak & off-peak separately?

If yes, you can enter peak and off-peak kWh separately for each bill

Where to find your bill data

📄	Paper / PDF bill — look for "Consumo" or "Usage" in kWh and the total amount due
📱	EDP/Endesa/Iberdrola app — "Histórico de consumo" shows monthly breakdown
🔌	Smart meter — shows "Vazio" (off-peak) and "Fora de Vazio" (peak) separately
💳	Bank statement — gives cost; estimate kWh from prior bills or use 300–500 for an average home

Only have 1 or 2 months? That's fine — just fill in what you have and leave the rest blank.

Most recent month

Month

Total kWh used

Total cost (incl. standing)

2 months ago

Month

Total kWh used

Total cost (incl. standing)

3 months ago

Month

Total kWh used

Total cost (incl. standing)

Household

Number of people

2 people

Property type

Working from home

2 days/week

WFH significantly increases daytime electricity use

Heating system

Air conditioning / heat pump cooling?

Solar & battery

Solar panels installed?

Battery storage?

Electric vehicle

Do you have an EV or PHEV?

Laundry & kitchen

Washing machine — loads per week

5 loads

When do you usually run it?

Tumble dryer?

Dishwasher runs per week (0 = no dishwasher)

7 runs

When do you usually run the dishwasher?

Other loads

Swimming pool pump?

Hot water — how is it heated?

Anything else using a lot of electricity?

Almost done! Click "Get my analysis" and the AI will review your profile and generate personalised recommendations — streaming word by word, usually in 15–30 seconds.

Your personalised report

Connecting to Workers AI…

While you wait…

The AI is reading your actual bills and usage patterns. It will calculate specific euro amounts — not generic percentages — based on your real numbers and local electricity rates.

Estimated time: 15–40 seconds

Model: Llama 3.1 8B Instruct

Running on: Cloudflare Workers AI