International Sustainable Energy Foundation: $36.9M Revenue, $18.2M Program Expenses

On the LakeQuality nonprofit efficiency rubric, International Sustainable Energy Foundation pulls an A — the highest available grade. The 84/100 composite reflects a combination of program-focused spending, controlled overhead, and the kind of multi-year financial discipline that grant-makers look for.

At $36.9M in 2023 revenue, International Sustainable Energy Foundation sits in the mid-range of the U.S. nonprofit distribution. Most organizations of this scale operate regionally or focus on a single program area. Program-spending efficiency is strong: 80% of total expenses flow to program activities, above the 75% benchmark most third-party charity raters use.

Multi-year revenue history is incomplete in the available filings, so the trend direction can't be assessed reliably from the current dataset. CEO compensation is reported as zero in the filing — typical for nonprofits where the chief executive is paid through a related entity (parent system, university, or foundation) rather than the filing organization itself, or for small organizations whose chief is a volunteer or board member. International Sustainable Energy Foundation works in Environment & Animals — environmental, conservation, animal-welfare, and natural-resources programs. The sector spans large international conservation groups and small local land trusts; the financial profile varies accordingly.