How is my current renewable percentage calculated?

It is the sum of your renewable procurement — PPAs, on-site generation, and RECs — divided by your total annual electricity consumption, expressed as a percent. The tool caps renewable at total load since you cannot exceed 100% of what you consume.

What is the required annual growth rate?

It is the compound annual growth rate your renewable procurement must follow, starting from today's level, to fully cover your load by the target year, assuming flat consumption. If you procure nothing yet, a growth rate is undefined and you must simply begin.

Why does linear procurement differ from the growth rate?

Linear procurement spreads the remaining shortfall evenly across the years, giving a fixed MWh to add each year. The growth rate instead compounds off your existing base. Both are valid planning lenses; the linear figure is easier to budget while the rate shows momentum.

Do RECs count the same as PPAs under RE100?

RE100 prioritises power purchase agreements and on-site generation and applies credibility criteria to unbundled RECs. A portfolio heavy in low-quality RECs may not fully count toward the pledge, so treat the percentage as an upper bound and check RE100's technical guidance.

Does this assume my electricity use stays flat?

Yes. The calculation holds total load constant to the target year. If you expect demand to grow, your real procurement target rises, so re-run the tool with a higher projected total or revisit it annually as load changes.

RE100 Renewable Energy Pledge Progress Calculator

A 100% renewable electricity pledge only means something if you can show a year-on-year trajectory toward it. This calculator turns your current procurement mix and target year into a clear percentage, a shortfall, and the procurement pace you need to actually hit the goal.

How it works

The maths is straightforward but easy to get wrong by hand:

current RE %     = renewable MWh / total MWh × 100
shortfall        = total MWh − renewable MWh
years remaining  = target year − current year
linear per year  = shortfall / years remaining
required growth  = (total / current renewable)^(1/years) − 1

Renewable procurement is the sum of PPAs, on-site generation, and RECs, capped at your total load. The required growth rate is a compound annual growth rate off your existing base — if that base is zero, no rate is defined and the linear figure becomes your starting target.

Example and notes

A company using 120,000 MWh a year that already sources 40,000 MWh of renewables is at 33% today. To reach 100% by 2030 from 2026 it must roughly triple procurement over four years — a compound growth rate of about 32% a year, or 20,000 MWh added linearly each year. RE100 weights PPAs and on-site generation above unbundled RECs, so a REC-heavy mix may not count in full toward the pledge.