The long arithmetic of energy, run on your own figures.

What it runs

Solar, storage and electrification are long arithmetic: a price today set against rates, fuel and wear across decades. A sales proposal and a capable AI will both state that arithmetic with confidence. Here, code runs it on your own figures, with each assumption in plain view.

• Solar

  Payback as panels age and rates rise, tested across the rises you choose. Net metering set beside net billing on your own year. The cost per kWh of any source. The timing of a credit that is ending.

• Storage

  A battery's capacity as it fades with cycles and age, and what shifting power between hours returns. How long it carries the loads you actually depend on.

• Home

  The fuel you burn set beside the same heat from a heat pump, with the electric rate where the two match. Upgrades set side by side on payback and present saving.

• Transport

  Fuel and electric vehicles on running cost and total cost, with the fuel price where they match. A fleet followed group by group.

• Carbon

  CO2 per kWh, mile and gallon, from your grid's figure and the EPA's factors for fuel. Your options ordered by what each tonne avoided costs.

• Knowledge and laws

  What each term means, and where to find your own figure. The laws, programs, executive orders, rules and decisions that set these terms, by date, each with its citation.

Where the figures come from

Nothing on this page is a benchmark we typed in. A figure is yours, or it is a physical constant from a named public source.

• Yours

  Rates, quotes, usage, mileage and grid intensity are your own, and change from place to place. Example figures hold their place until you change them.

• Public

  Fuel heat and CO2 come from the U.S. EPA's Emission Factors Hub, and the audit trail records it. They count burning only.

• Policy

  A credit, a rate rule or an export price is an input you enter, on the terms that apply to you. The Laws tab states what was enacted and what followed, as fact. It holds no opinion on what the law should be.

• Shown

  Each result carries an ID, its inputs and its method, and downloads with its audit trail.

What it declines to do

• Sell

  There is no installer, panel, vehicle or referral here, and no one is paid on your result.

• Forecast

  A rate rise is your assumption. Nothing here says what energy will cost.

• Decide

  It shows what each course does on your figures. Tax, legal and electrical questions belong with a licensed professional.

• Certify

  A CO2 figure here is arithmetic on your quantities. It is not an audited inventory or a claim you may publish.

Clarity first. The decisions remain yours.