CC Reactor

local reactor = peripheral.find("BigReactors-Reactor")
local capacitor = peripheral.find("enderio:tile_cap_bank")

local function controlRodInsertionLevelByEnergyStored(goal_percentage)
    local total_energy = reactor.getEnergyStored()
    local energy_capacity = reactor.getEnergyCapacity()

    if capacitor ~= nil then
        total_energy = total_energy + capacitor.getEnergyStored()
        energy_capacity = energy_capacity + capacitor.getEnergyCapacity()
    end

    return math.floor(math.min(total_energy / energy_capacity * 100 / (goal_percentage / 100), 100))
end

local function main(goal_percentage)
    while true do
        local control_rod_insertion_level = controlRodInsertionLevelByEnergyStored(goal_percentage)
        reactor.setAllControlRodLevels(control_rod_insertion_level)

        if control_rod_insertion_level < 80 then -- we may as well shut off at eighty percent to save on some fuel
            reactor.setActive(true)
        else
            reactor.setActive(false)
        end

        term.clear()
        term.setCursorPos(1, 1)
        term.write(control_rod_insertion_level)

        sleep(10)
    end
end

main(30)