In most reasonable collapse scenarios I could imagine, energy isn't so much a technological concern as it might be a political concern. Slightly scarcer perhaps, but there's a ubiquity of old alternators, plenty of shit to burn, and I guarantee the extractive industries will be among the first to come online, if they ever went out in the first place, and can be coaxed to function in a degraded state without globalized supply chains or too much esoteric knowledge.
Computers are much more difficult to bring back: much of their manufacture and distribution is highly dependent on a globalized supply chain, which in turn is dependent on the security guarantees of an international order backed by military force. Many of their parts are proprietary by nature, and individual components can at their simplest require rare expertise in multiple niche fields of science before their production can even be considered.
Computers are much more difficult to bring back: much of their manufacture and distribution is highly dependent on a globalized supply chain, which in turn is dependent on the security guarantees of an international order backed by military force. Many of their parts are proprietary by nature, and individual components can at their simplest require rare expertise in multiple niche fields of science before their production can even be considered.