Energy Calculators UK | Project, Curtailment & Cost Tools

🏠 For Homeowners & Consumers

General Public Calculators

Estimate your energy bills, savings potential, and environmental impact.

💷

Energy Bill Estimator

Estimate annual and monthly energy costs based on your usage and current Ofgem price cap rates.

Annual Electricity (kWh)

Annual Gas (kWh)

Elec Unit Rate (p/kWh)

Gas Unit Rate (p/kWh)

Elec Standing Charge (p/day)

Gas Standing Charge (p/day)

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Estimated annual bill

Based on the figures entered. Rates default to Ofgem Q1 2025 price cap. Actual bills vary.

🔌

Tariff Savings Calculator

Compare two tariffs to see your potential annual saving.

Annual Electricity Usage (kWh)

Annual Gas Usage (kWh)

Current Tariff

Elec (p/kWh)

Gas (p/kWh)

New Tariff

Elec (p/kWh)

Gas (p/kWh)

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Estimated annual saving

Standing charges not included. Actual savings vary by region, meter type and supplier terms.

☀️

Solar Panel Payback Calculator

Estimate when your solar installation will pay for itself and your 25-year savings.

System Size (kWp)

Installation Cost (£)

Annual Generation (kWh/kWp)

Electricity Rate (p/kWh)

Self-consumption (%)

Export Rate (p/kWh)

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Estimated payback period

UK average yield ~900 kWh/kWp/yr. Results are estimates — actual generation depends on location, pitch and shading. SEG export rates vary by supplier.

🚗

EV vs Petrol / Diesel Cost

Compare the annual running cost of an electric vehicle against a petrol or diesel car.

Annual Mileage

Petrol/Diesel MPG

Fuel Price (p/litre)

EV Efficiency (miles/kWh)

Charging Rate (p/kWh)

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Annual fuel cost saving (EV vs ICE)

Home overnight charging assumed. Public rapid charging costs more. Vehicle purchase price difference not included.

🌍

Home Energy Carbon Footprint

Estimate your home's annual CO₂ emissions from electricity and gas consumption.

Annual Electricity (kWh)

Annual Gas (kWh)

Grid Intensity (gCO₂/kWh)

Fuel: Natural Gas (gCO₂/kWh)

Green Electricity Tariff?

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Annual home energy CO₂ emissions

UK average home: ~2.5 tCO₂e/yr from energy. Grid intensity source: National Grid ESO Carbon Intensity API (2024 avg ~215 gCO₂/kWh).

⚡

Smart Tariff / Time-of-Use Savings

Estimate how much you could save by shifting usage to off-peak hours on a smart tariff.

Annual Electricity Usage (kWh)

Current Flat Rate (p/kWh)

% Shifted to Off-Peak

Off-Peak Rate (p/kWh)

Peak Rate (p/kWh)

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Estimated annual saving

Based on Octopus Agile/Go-style off-peak rates. Requires a smart meter. Actual savings depend on your ability to shift EV charging, dishwasher, washing machine etc.

🏭 For Energy Professionals

Professional Energy Calculators

Financial modelling tools for developers, consultants, brokers, and energy investors.

📊

Levelised Cost of Energy (LCOE)

Calculate the lifetime cost per MWh of a generation asset using discounted cash flows.

Installed Capacity (MW)

Capacity Factor (%)

Capex (£/kW)

Opex (£/kW/yr)

Project Life (years)

Discount Rate (%)

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Levelised Cost of Energy

Simplified LCOE model. Does not include grid connection, decommissioning, insurance, or tax. Use for indicative modelling only.

🔋

Battery Storage Revenue Estimator

Estimate annual revenue from grid services and arbitrage for a BESS project.

Capacity (MWh)

Power (MW)

Cycles per Day

Round-trip Efficiency (%)

Arbitrage Spread (£/MWh)

FFR / BM Revenue (£/MW/yr)

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Estimated annual gross revenue

Indicative only. Balancing mechanism and ancillary service revenues are highly market-dependent. Excludes Capex, Opex, degradation, and grid connection costs.

🏭

Solar Farm Yield & Revenue

Annual energy yield and revenue estimate for a utility-scale solar PV project.

DC Capacity (MWp)

DC/AC Ratio (clipping)

Irradiance (kWh/m²/yr)

System Efficiency (%)

Degradation (%/yr)

Power Price (£/MWh)

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Year-1 generation

PR (Performance Ratio) = system efficiency. UK average irradiance ~1,000–1,200 kWh/m²/yr. Excludes curtailment, grid losses, and availability factors.

💨

Wind Farm Capacity Factor & Output

Estimate annual energy output, load factor, and revenue for a wind project.

Installed Capacity (MW)

Capacity Factor (%)

Availability Factor (%)

Grid Losses (%)

Wholesale Price (£/MWh)

CfD Strike Price (£/MWh)

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Estimated net annual generation

UK offshore wind typical CF: 40–55%. Onshore: 25–35%. CfD payment = max(0, Strike Price − Reference Price) × net generation.

📈

CfD Break-even Analysis

Find the minimum strike price needed to achieve your target return on a CfD project.

Total Project Capex (£m)

Annual Opex (£m/yr)

Annual Generation (GWh)

Project Life (years)

Target IRR (%)

Debt Gearing (%)

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Minimum CfD strike price required

Simplified levelised revenue requirement model. Assumes constant generation and costs. Actual CfD modelling requires detailed financial modelling with tax, depreciation and debt service.

📋

Power Purchase Agreement (PPA) Calculator

Compare PPA pricing against wholesale market and estimate long-term value.

Annual Volume (MWh)

PPA Contract Length (yrs)

PPA Strike Price (£/MWh)

Current Wholesale (£/MWh)

Baseload Escalation (%/yr)