In this excerpt from the Manual for Self Realization: 112 Meditations of the Vijnana Bhairava Tantra, Swami Lakshmanjoo explains how "Energy is the means by which you can understand and enter in the state of Lord Shiva."
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न वह्नेर्दाहिका शक्तिः
व्यतिरिक्ता विभाव्यते ।
प्रारम्भोऽयं प्रवेशने ॥१९॥
na vahnerdāhikā śaktiḥ
vyatiriktā vibhāvyate /
prārambho’yaṁ praveśane // 19 //
Because, when there is a fire (for instance, there is a fire), its energy is dāhikā57, [and dāhikā’s] energy is pācikā58 [and] prakāśikā59. All these energies are owned by fire, but those energies–lightening, giving light, burning, heating, all these energies are produced from fire–but these energies are undifferentiated with fire. From fire, these energies are not different from fire. That is what he says: na vahner, from fire, dāhikā śakti, the energy of burning, burning energy, is not vyatiriktā (separated) vibhāvyate (found), it is not found that it is separated.
Kevalaṁ jñāna sattāyāṁ prārambho’yaṁ praveśane, it is just to enter in that state of fire, i.e., to put a kettle on it or to put fuel on it (dāhikā, prakāśikā, and pācikā). It is just to enter in the state of fire, i.e., to put fuel and to put that kettle [on it].
So, [in the same way], it is just to enter in the jñāna sattā of Lord Śiva. You have to enter in the jñāna sattā60 of Lord Śiva, and [although] you are maintaining the nāvatma mantra and all these [processes], these are nothing. [They are] only prārambha, just to begin with.
निर्विभागेन भावना ।
तदासौ शिवरूपी स्यात्
शैवी मुखमिहोच्यते ॥२०॥
nirvibhāgena bhāvanā /
tadāsau śivarūpī syāt
śaivī mukhamihocyate // 20 //
When you enter in the state of energy and leave your individual state (you have not to enter in the state of energy for always), you have to throw off the individual state and enter in the energy to enter in the universal state in the end. Because, unless you [throw] off your individuality, universality will not rise, universality won’t take place.
So you have to enter in the state of energy first (śakti avasthā praviṣṭasya), then afterward, yadā nirvibhāgena bhāvanā bhavet, when you feel that undifferentiated-ness comes in your consciousness–undifferentiated between energy and the holder of energy–tadāsau śivarūpī syāt, at that very moment, this sādhaka61, his bhāvanā62 becomes one with Lord Śiva.
So, the path is Śakti, the path is not Śiva (śaivī means Śakti). Energy is mukham, the path is iha, here, ucyate, explained. Energy is the real path you have to tread.
किरणैर्भास्करस्य च ।
तद्वच्छक्त्या शिवः प्रिये ॥२१॥
kiraṇairbhāskarasya ca /
tadvacchaktyā śivaḥ priye // 21 //
O dear Pārvatī, just like with the light of your candle or torch (dīpasya ālokena, by the light of your torch, or candle, or by the rays of the sun), all the differentiated points of deśa (space) are known, are understood, in the same way, Śiva is being understood by Śakti, by His energy.
Energy is the means by which you can understand and enter in the state of Lord Śiva.
60 Knowledge or intelligence (jñāna) of Being or existence (sattā).
62 Contemplation, meditation, in continuity; when you sentence your mind with awareness to one point.
(source: Manual for Self Realization: 112 Meditations of the Vijnana Bhairava Tantra,
by Swami Lakshmanjoo)