How do I reduce diesel dependence at a remote site?

Structurally, by changing what the generator is for. A diesel-only site runs a generator continuously against a variable load, spending most of its life lightly loaded, where it is least efficient and where wet stacking and maintenance issues originate. A solar-hybrid system serves the load from generation and storage and starts the generator only to recharge, at high load, for a defined period. The measure to hold a supplier to is generator run hours per week, because run hours drive fuel, servicing and refuelling trips together. We model expected consumption and renewable fraction in the proposal rather than quoting a percentage.