According to HerHusband :

I don't know much about the Amish, but I thought the idea was to avoid
modern technology? Couldn't they use lanterns as was done before electrical
lights were available?

It's not so much an avoidance of "modern technology", it's more of
an avoidance of depending on outside resources. Electricity isn't
as much of an issue as being connected to the grid is. Tho, it
depends on "which" Amish you're talking about. There are different
levels of interpretation, and different levels of willingness to
adapt to the modern world.

Eg: they won't have a car. But most won't turn down a ride in one
if it's going somewhere they need to go, and some aren't shy about
asking for a ride ;-)

Eg: many Amish in the US came from Canada (south west Ontario) when
Canada imposed refrigeration requirements on dairy production. When the
corresponding US states imposed refrigeration, some Amish moved either
to states that didn't require it, or to Mexico. Others adapted and
stayed where they are. Most Amish, for example, refuse to have a
telephone. But as an example of "modern compromise", some will have an
outdoor phone for calls pertaining to their dairy operation.

My wife and her sister bed-and-breakfasted with Pennsylvania
Amish farm families, and recounted the amusing incident where
the Amish family's teenage daughter had to stand outside in the rain
at the "dairy phone" to talk to one of her friends.

I thought of bicycle generators (car-size alternators or generators
will sometimes present too much load to the available horse power ;-)
too.

However, I don't think they'd be terribly effective long-term
solutions. They'd always be diddling with them. Something
simple and mostly maintenance free is better.

Perhaps LED lights and a smallish solar panel. Should allow them
to use smaller/cheaper batteries too.
--
Chris Lewis,

Age and Treachery will Triumph over Youth and Skill
It's not just anyone who gets a Starship Cruiser class named after them.