Energy harvesting spans microwatts to megawatts because it is the creation of electricity where it is needed using wind, sun, movement, heat difference, friction and other ambient energy.

A trillion dollar opportunity to 2035, electric buses are being completely reinvented because they are the electric vehicle sector already attracting billion dollar orders and they can prevent millions of deaths and injuries from air pollution.

It seems obvious; energy harvesting is intermittent, so combine different types to make it continuous and therefore much more useful.

Plenty of kilowatts from no fuel. This dream ticket is a reality today from the rapid adoption of high power energy harvesting. Energy harvesting converts ambient energy into electricity where it is needed, off-grid.

The term 'energy harvesting' is most typically applied to powering small electronic devices using say sunshine, vibration or temperature.

Analysts IDTechEx almost completely rewrote their report Power Electronics for Electric Vehicles 2015-2025 this year and frequent updates take place, such is the pace of change.

Elastic piezoelectric generators are being developed with microwatts demonstrated and watts in prospect for large formats.

Energy harvesting is the creation of off-grid electricity where it is needed using ambient energy, from sunshine to vibration or temperature difference.